JP2021136536A - Taper slot antenna with wide structure - Google Patents

Abstract

To provide a taper slot antenna with a wide structure, having a directive characteristic with a wide beam width and a wide range characteristic with less frequency change in a high frequency, and capable of reducing a cost.SOLUTION: A taper slot antenna 10 according to the present disclosure, comprises: a near C-character shaped center conductor 19; a near triangle shaped first taper conductor 11 in view of a vertical direction to the center conductor 19, which is extended from a first part 191, includes a first side face 11S1 in a direction crossing an extension direction, includes a second side face 11S2 in a direction opposite to the crossing direction; and a near triangle shaped second taper conductor 12 in view of the vertical direction, which is extended from the second part 192. A distance between a tip P11f1 at a top where the first taper conductor 11 is extended and a tip P12f1 at a top where the second taper conductor 12 is extended is longer than a distance between an end P11n near a slit St of the first taper conductor 11 and an end P12n near the slit St of the second taper conductor 12.SELECTED DRAWING: Figure 1B

Description

The present disclosure relates to a tapered slot antenna having a wide structure, and particularly at a high frequency, a tapered slot having a wide structure which has a wide beam width directivity characteristic and a wide band characteristic with little frequency change and can reduce the cost. Regarding the antenna.

An antenna having a single directivity in a wide frequency band and having linearly polarized waves includes a tapered slot antenna. A taper slot antenna is an antenna having a shape in which two conductor plates having their ends facing each other vertically at a short distance gradually expand as the distance between the two opposing conductor plates goes to the tip of the conductor plate. ..

In Non-Patent Document 1 1.6.2 and FIG. 1.83, "The tapered slot antenna has a slot line that is tapered and the tip is open, as shown in FIG. 1.83 (a). It is an antenna that realizes a large amount of radiation while avoiding the generation of backward waves. The Tapered Slot Antenna (TSA) is a non-resonant type antenna, and has wideband characteristics in both impedance and radiation pattern. " It is described as.

In paragraph 0015 and FIG. 1 of Patent Document 1, "In FIG. 1, 1 is a dielectric substrate, 2 is a metal conductor portion formed on the dielectric substrate, and 2 is a metal conductor portion formed on the metal conductor portion. An antenna element having a tapered portion whose slot width gradually expands toward the end, 5 is a microstrip line, and 6 is a mode conversion of a high-frequency signal supplied by the microstrip line and transmitted onto the slot line of the antenna element. Microstrip slot converter, 8 is a power supply unit to which a high-frequency signal is supplied by a distributor, 9 is a dielectric substrate, a metal conductor unit, an antenna element, a microstrip line, and a converter in which a high-frequency signal is input from an input end. A distributor that distributes and feeds a high-frequency signal to each tapered slot antenna unit including a feeding unit, and 12 is connected to each feeding unit of each tapered slot antenna unit, and the high-frequency signal distributed by the distributor is distributed to each tapered slot antenna. It is a power supply line that supplies power to the power supply unit of the unit. " Further, in paragraph 0016 of Patent Document 1, "Each taper slot antenna portion is configured in substantially the same manner, is arranged radially around the feeding portion, and is an end portion of the dielectric substrate, that is, a taper on which radio waves are radiated. The opening of the slot antenna portion is provided so as to be arranged on an arc line. " As described above, since the antenna device of Patent Document 1 has a distributor for distributing and feeding a high frequency signal to each tapered slot antenna portion, the cost is correspondingly higher than that without the distributor.

In paragraph 0003 of Patent Document 2, "The tapered slot antenna is provided on a dielectric substrate, a first conductor plate and a second conductor plate patterned on one surface of the dielectric substrate, and the other surface of the dielectric substrate. It is provided with a microstrip line formed and for supplying power to a tapered slot composed of a first conductor plate and a second conductor plate, and a through hole provided in a dielectric substrate at an end portion of the microstrip line. "." Is described. Further, in paragraph 0004 of Patent Document 2, "the taper slot is configured so that its width gradually increases in a tapered shape from the feeding point side (the side where the microstrip line is provided) to the front side. The tip portion is an opening for a radiation portion. Further, the tapered shape of the tapered slot is formed symmetrically with respect to the center line of the tapered slot antenna. " Patent Document 2 does not describe that the high frequency directivity characteristic is a wideband characteristic.

Naohisa Goto, Masao Nakagawa, Kiyohiko Ito ed. "Antenna / Radio Handbook" Ohmsha Co., Ltd. October 25, 2006 First edition, first edition published Japanese Unexamined Patent Publication No. 2003-188643 JP-A-2009-005086

As described above, all of Non-Patent Document 1, Patent Document 1, and Patent Document 2 have a wideband characteristic with little frequency change in the high frequency directivity characteristic, and a taper slot capable of reducing the cost. There is no description about the antenna, and such an antenna has been desired.

An object of the present disclosure is to provide a tapered slot antenna that solves the above-mentioned problems.

The wide-structured tapered slot antenna according to the present disclosure is
It has a short-circuited portion, a first portion to be coupled to a part of the short-circuited portion, and a second portion to be coupled to another part of the short-circuited portion, and is between the first portion and the second portion. With a substantially U-shaped central conductor with a slit formed in
It extends from the first portion, has a first side surface in a direction intersecting the extending direction, has a second side surface in a direction opposite to the intersecting direction, and is substantially perpendicular to the central conductor. The first tapered conductor in the shape of a triangle,
A second tapered conductor extending from the second portion and having a substantially triangular shape when viewed from a direction perpendicular to the central conductor,
With
The distance between the extended tip of the first tapered conductor and the extended tip of the second tapered conductor is the distance between the end of the first tapered conductor near the slit and the second tapered conductor. Longer than the distance to the end near the slit,
The distance between the first side surface and the second side surface at the extended tip of the first tapered conductor is greater than the distance between the first side surface and the second side surface at the end close to the slit. Long,
The first tapered conductor has a third side surface that intersects the direction from the second portion to the first portion.
The distance between the coupling point that couples with the first portion of the third side surface and the side facing the coupling point is the first that is close to the coupling point and the first side surface of the first tapered conductor. Shorter than the distance between the tip and
The distance between the coupling point and the side facing the coupling point is shorter than the distance between the coupling point and the second tip near the second side surface of the first tapered conductor.
Power is supplied to the first portion and the second portion.

The wide-structured tapered slot antenna according to the present disclosure is
It has a short-circuited portion, a first portion to be coupled to a part of the short-circuited portion, and a second portion to be coupled to another part of the short-circuited portion, and is between the first portion and the second portion. With a substantially U-shaped central conductor with a slit formed in
It extends from the first portion, has a first side surface in a direction intersecting the extending direction, has a second side surface in a direction opposite to the intersecting direction, and is substantially perpendicular to the central conductor. The first tapered conductor in the shape of a triangle,
A second tapered conductor extending from the second portion and having a substantially triangular shape when viewed from a direction perpendicular to the central conductor,
With
The distance between the extended tip of the first tapered conductor and the extended tip of the second tapered conductor is the distance between the end of the first tapered conductor near the slit and the second tapered conductor. Longer than the distance to the end near the slit,
The distance between the first side surface and the second side surface at the extended tip of the first tapered conductor is greater than the distance between the first side surface and the second side surface at the end close to the slit. Long,
The first tapered conductor has a third side surface that intersects the direction from the second portion to the first portion.
The distance between the coupling point that couples with the first portion of the third side surface and the side facing the coupling point is the first that is close to the coupling point and the first side surface of the first tapered conductor. Shorter than the distance between the tip and
The distance between the coupling point and the side facing the coupling point is shorter than the distance between the coupling point and the second tip near the second side surface of the first tapered conductor.
Power is supplied to the first part and the second part.
The self-tapered slot antenna is covered with a wall formed of a conductor, a dielectric, or a conductive material containing the conductor and the dielectric in a direction other than the main beam direction of the radio wave radiated by the self-tapered slot antenna.

The wide-structured orthogonal taper slot antenna according to the present disclosure is
It is equipped with a first taper slot antenna and a second taper slot antenna.
The first taper slot antenna is
A first antenna short-circuited portion, a first antenna first portion coupled with a part of the first antenna short-circuited portion, and a first antenna second portion coupled with another part of the first antenna short-circuited portion. A substantially U-shaped first antenna central conductor having a first antenna slit formed between the first portion of the first antenna and the second portion of the first antenna.
The first antenna extends from the first portion of the first antenna, has a first side surface of the first antenna in a direction intersecting the extending direction, and has a second side surface of the first antenna in a direction opposite to the intersecting direction. 1 The first antenna first taper conductor, which has a substantially triangular shape when viewed from the direction perpendicular to the center conductor of the antenna,
A first antenna second tapered conductor extending from the second portion of the first antenna and having a substantially triangular shape when viewed from a direction perpendicular to the center conductor of the first antenna.
With
The distance between the extended tip of the first antenna first tapered conductor and the extended tip of the first antenna second tapered conductor is determined by the first of the first antenna first tapered conductors. Longer than the distance between the end close to the antenna slit and the end of the first antenna second tapered conductor near the first antenna slit,
The distance between the first side surface of the first antenna and the second side surface of the first antenna at the extended tip of the first taper conductor of the first antenna is the first at the end close to the slit of the first antenna. Longer than the distance between the first side surface of the antenna and the second side surface of the first antenna,
The first antenna first tapered conductor has a third side surface of the first antenna that intersects the direction from the second portion of the first antenna toward the first portion of the first antenna.
The distance between the first antenna coupling point that couples with the first antenna first portion on the third side surface of the first antenna and the side that faces the first antenna coupling point is the same as the first antenna coupling point. , Shorter than the distance between the first tip of the first antenna near the first side surface of the first antenna of the first tapered conductor of the first antenna.
The distance between the first antenna coupling point and the side facing the first antenna coupling point is the distance between the first antenna coupling point and the first antenna second side surface of the first antenna first tapered conductor. Shorter than the distance between the second tip of the first antenna, which is close to
Power is supplied to the first portion of the first antenna and the second portion of the first antenna.
The second taper slot antenna is
A second antenna short-circuited portion, a second antenna first portion coupled to a part of the second antenna short-circuited portion, and a second antenna second portion coupled to another part of the second antenna short-circuited portion. A substantially U-shaped second antenna central conductor having a second antenna slit formed between the first portion of the second antenna and the second portion of the second antenna.
The second antenna extends from the first portion of the second antenna, has a first side surface of the second antenna in a direction intersecting the extending direction, and has a second side surface of the second antenna in a direction opposite to the intersecting direction. 2 The 2nd antenna 1st taper conductor, which has a substantially triangular shape when viewed from the direction perpendicular to the center conductor of the 2 antennas,
A second antenna second tapered conductor extending from the second portion of the second antenna and having a substantially triangular shape when viewed from a direction perpendicular to the center conductor of the second antenna.
With
The distance between the extended tip of the second antenna first tapered conductor and the extended tip of the second antenna second tapered conductor is determined by the distance between the extended tip of the second antenna first tapered conductor. Longer than the distance between the end near the antenna slit and the end of the second antenna second taper conductor near the second antenna slit,
The distance between the first side surface of the second antenna and the second side surface of the second antenna at the extended tip of the first taper conductor of the second antenna is the second at the end close to the slit of the second antenna. Longer than the distance between the first side surface of the antenna and the second side surface of the second antenna,
The second antenna first tapered conductor has a third side surface of the second antenna that intersects the direction from the second portion of the second antenna toward the first portion of the second antenna.
The distance between the second antenna coupling point that couples with the first portion of the second antenna on the third side surface of the second antenna and the side that faces the second antenna coupling point is the same as the second antenna coupling point. , Shorter than the distance between the first tip of the second antenna near the first side surface of the second antenna of the first tapered conductor of the second antenna.
The distance between the second antenna coupling point and the side facing the second antenna coupling point is the distance between the second antenna coupling point and the second antenna second side surface of the second antenna first tapered conductor. Shorter than the distance between the second tip of the second antenna, which is close to
Power is supplied to the first part of the second antenna and the second part of the front second antenna.
The first antenna so that the direction from the second part of the first antenna toward the first part of the first antenna and the direction from the second part of the second antenna toward the first part of the second antenna are orthogonal to each other. The center conductor and the center conductor of the second antenna intersect.

According to the present disclosure, it is possible to provide a tapered slot antenna having a wide beam structure, which has a wide beam width directivity characteristic and a wide band characteristic with little frequency change at high frequencies, and which can reduce the cost.

It is a perspective view which illustrates the taper slot antenna which concerns on Embodiment 1. FIG. It is a perspective view which illustrates the taper slot antenna which concerns on Embodiment 1. FIG. It is a schematic diagram which illustrates the operation of a taper slot antenna. It is a schematic diagram which illustrates the directivity of the antenna shown in FIG. 2A. It is a schematic diagram which illustrates the operation of a taper slot antenna. It is a schematic diagram which illustrates the directivity of the antenna shown in FIG. 2C. It is a schematic diagram which illustrates the operation of the taper slot antenna which concerns on Embodiment 1. FIG. It is a schematic diagram which illustrates the operation of the taper slot antenna which concerns on Embodiment 1. FIG. It is a schematic diagram which illustrates the directivity of the antenna shown in FIG. 3A and FIG. 3B. It is a schematic diagram which illustrates the operation of the taper slot antenna which concerns on Embodiment 1. FIG. It is a schematic diagram which illustrates the operation of the taper slot antenna which concerns on Embodiment 1. FIG. It is a schematic diagram which illustrates the directivity of the antenna shown in FIG. 3D and FIG. 3E. It is a perspective view which illustrates the simulation model of the taper slot antenna which concerns on Embodiment 1. FIG. It is a perspective view which illustrates the simulation model of the taper slot antenna which concerns on the comparative example of Embodiment 1. FIG. It is a graph which illustrates the matching characteristic in the simulation model shown in FIG. 4A. It is a graph which illustrates the directivity characteristic in the simulation model shown in FIG. 4A, and the directivity characteristic in the simulation model shown in FIG. 4B. It is a graph which illustrates the directivity characteristic in the AZ plane at a frequency of 5 GHz. It is a perspective view which illustrates the taper slot antenna which concerns on Embodiment 2. FIG. It is a perspective view which illustrates the taper slot antenna which concerns on Embodiment 3. FIG. It is a perspective view which illustrates the taper slot antenna which concerns on Embodiment 4. FIG. It is a perspective view which illustrates the taper slot antenna which concerns on Embodiment 5. It is a perspective view which illustrates the taper slot antenna which concerns on Embodiment 6. It is a perspective view which illustrates the taper slot antenna which concerns on Embodiment 7. It is a perspective view which illustrates the taper slot antenna which concerns on Embodiment 8. It is a perspective view which illustrates the taper slot antenna which concerns on Embodiment 9. FIG. It is a perspective view which illustrates the taper slot antenna which concerns on Embodiment 10. It is a perspective view which illustrates the taper slot antenna which concerns on Embodiment 11. FIG. It is a perspective view which illustrates the taper slot antenna which concerns on Embodiment 12. It is a perspective view which illustrates the orthogonal taper slot antenna which concerns on Embodiment 13. It is a perspective view which illustrates the orthogonal taper slot antenna which concerns on Embodiment 14. It is a perspective view which illustrates the taper slot antenna which concerns on Embodiment 15. FIG. It is a perspective view which illustrates the taper slot antenna which concerns on Embodiment 16. It is a perspective view which illustrates the taper slot antenna which concerns on Embodiment 17.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, the same or corresponding elements are designated by the same reference numerals, and duplicate description will be omitted as necessary for the sake of clarity of description.

[Embodiment 1]
First, the problem will be described in detail.
The tapered slot antennas shown in Non-Patent Document 1, Patent Document 1 and Patent Document 2 are often used as antennas having a wide band matching characteristic and a single directivity of linearly polarized light. A wide band matching characteristic means that the fluctuation of the input impedance is small in a wide frequency band, and the voltage standing wave ratio (VSWR) is suppressed to a low value in a wide frequency band. Means. On the other hand, the antenna is for radiating radio waves into space to perform wireless communication, but when radio waves are radiated into space, the spread of radio waves, that is, the directivity characteristics greatly fluctuate depending on the frequency. The tapered slot antenna has a directional characteristic with a wide beam width at a low frequency, and the beam width becomes narrower as the frequency increases, resulting in a sharp beam. Further, the tapered slot antenna may form a null beam in which the gain is minimized at another frequency (higher frequency, etc.) even in the direction in which the maximum gain is obtained in the low frequency band. The narrowing of the beam width and the formation of a null beam at high frequencies are disadvantageous points when wireless communication is performed in a wide frequency band.

Here, consider a case where wireless communication is performed with a wireless station in a predetermined area in a wide frequency band from a low frequency to a high frequency. When a normal tapered slot antenna is used, in a low frequency band, the beam width is wide, so that the coverage area of wireless communication is wide, and wireless communication can be performed with many wireless terminals (opposite wireless stations). For example, when the beam width of the tapered slot antenna is 60 degrees, wireless communication can be performed with a wireless terminal existing in an area having a beam width of 60 degrees. However, tapered slot antennas have a narrower beamwidth at higher frequencies. For example, when the beam width of the tapered slot antenna is 40 degrees at a high frequency, there is a problem that even a wireless terminal capable of wireless communication at a low frequency cannot perform wireless communication at a high frequency.

Further, consider the case where the tapered slot antenna is used as the primary radiator of the parabolic antenna. In the parabolic antenna, the radio wave from the antenna used for the primary radiator is uniformly irradiated to the parabolic reflector to operate so as to obtain high efficiency, that is, high gain. However, in a tapered slot antenna whose beam width fluctuates due to changes in frequency, the radio waves are not uniformly irradiated to the parabolic reflector, and at high frequencies, the radio waves are more concentrated near the center of directivity, and the efficiency of the antenna is reduced. There was a problem that it decreased and the gain decreased.

To solve these problems, an antenna with a wide band and a small frequency change in the directivity characteristics (radiation pattern characteristics) is required.

Therefore, the wide-structured tapered slot antenna according to the first embodiment for solving the above problem will be described. First, the structure of a wide tapered slot antenna will be described. In the description, the tapered slot antenna having a wide structure may be simply referred to as a tapered slot antenna.
FIG. 1A is a perspective view illustrating the tapered slot antenna according to the first embodiment.
FIG. 1B is a perspective view illustrating the tapered slot antenna according to the first embodiment.

As shown in FIG. 1A, the tapered slot antenna 10 according to the first embodiment includes a central conductor 19, a first tapered conductor 11, and a second tapered conductor 12.

The tapered slot antenna 10 has a structure in which the first tapered conductor 11 and the second tapered conductor 12 face each other vertically at a short distance. The tapered slot antenna 10 has a structure in which the first tapered conductor 11 and the second tapered conductor 12 are joined to the first portion 191 and the second portion 192 of the central conductor 19, respectively. The central conductor 19 has a slit St arranged in the central conductor 19 for supplying power. This slit St has a substantially U-shaped shape. The first tapered conductor may be referred to as a first radiating element, and the second tapered conductor may be referred to as a second radiating element.

In other words, the central conductor 19 has a short-circuited portion 193, a first portion 191 coupled to a portion of the short-circuited portion 193, and a second portion 192 coupled to another portion of the short-circuited portion 193. .. The central conductor 19 has a substantially U-shape in which a slit St is formed between the first portion 191 and the second portion 192.

The first tapered conductor 11 has a side plate 11a and a side plate 11b made of a conductor or a dielectric, an upper bottom plate 11c, and a radial surface plate 11d made of a conductor. The same applies to the second tapered conductor 12.

In other words, the first tapered conductor 11 extends from the first portion 191 and has a first side surface 11S1 in a direction intersecting the extending direction and a second side surface 11S2 in a direction opposite to the intersecting direction. .. The first tapered conductor 11 has a substantially triangular shape when viewed from a direction perpendicular to the central conductor 19. The outer surface of the side plate 11a is referred to as the first side surface 11S1, the outer surface of the side plate 11b is referred to as the second side surface 11S2, the outer surface of the bottom plate 11c is referred to as the third side surface 11S3, and the outer surface of the radial surface plate 11d is referred to. The surface is referred to as a fourth side surface 11S4.

The second tapered conductor 12 extends from the second portion 192 and has a substantially triangular shape when viewed from a direction perpendicular to the central conductor 19.

The width of the first tapered conductor 11 in the left-right direction gradually increases toward the tip P11f1, for example. The first tapered conductor 11 has a wide shape. The same applies to the second tapered conductor 12. Specifically, the distance D1s between the first side surface 11S1 and the second side surface 11S2 at the tip P11f1 is the distance D1s between the extension of the first taper conductor 11 and the first side surface 11S1 at the end P11n near the slit St. It is longer than the distance from the second side surface 11S2. More specifically, the angle θ1 formed by the first side surface 11S1 of the first tapered conductor 11 and the second side surface 11S2 of the first tapered conductor 11 when viewed from the direction from the second portion 192 to the first portion 191 is, for example, , 29 degrees or more and 35 degrees or less. The second tapered conductor 12 is the same as the first tapered conductor 11. That is, the angle θ2 formed by the first side surface 12S1 of the second tapered conductor 12 and the second side surface 12S2 of the second tapered conductor 12 when viewed from the direction from the second portion 192 to the first portion 191 is, for example, 29 degrees or more. It is 35 degrees or less.

The line segment where the third side surface 11S3 and the fourth side surface 11S4 of the first tapered conductor 11 meet is a part of a straight line, a circle, an ellipse, an nth-order function (n is an integer of 2 or more), an exponential function, a logarithmic curve, and the like. It may be configured. The shapes of the first side surface 11S1 and the second side surface 11S2 of the first tapered conductor 11 are wide of the fourth side surface 11S4 (radiating surface) of the first tapered conductor 11 and the fourth side surface 12S4 (radiating surface) of the second tapered conductor 12. It depends on the extent of the structure. The same applies to the second tapered conductor 12.

When the tapered slot antenna 10 is viewed from the direction from the second portion 192 to the first portion 191, the first tapered conductor 11 and the second tapered conductor 12 appear to have a wider structure toward the tip. Therefore, the tapered slot antenna 10 may be referred to as a wide tapered slot antenna (WTSA).

The distance between the first tapered conductor 11 and the second tapered conductor 12 facing each other in the vertical direction, that is, the distance between the radiating surface plate 11d and the radiating surface plate 12d gradually expands and increases toward the tip P11f1, for example. Become.

Specifically, the distance between the extended tip of the first tapered conductor 11, for example, the tip P11f1 and the extended tip of the second tapered conductor 12, for example, the tip P12f1, is defined as the distance D1f. The distance D1n is defined as the distance between the end P11n of the first tapered conductor 11 near the slit St and the end P12n of the second tapered conductor 12 near the slit St. At this time, the distance D1f is longer than the distance D1n.

Further, specifically, the distance between the first tapered conductor 11 and the second tapered conductor 12 at the first predetermined distance L1 from the near end P11n of the first tapered conductor 11 is defined as the distance D1. The distance D2 is defined as the distance between the first tapered conductor 11 and the second tapered conductor 12 at the second predetermined distance L2 in which the first predetermined distance L1 is also long from the near end P11n of the first tapered conductor 11. At this time, the distance D1 is shorter than the distance D2.

The taper slot antenna 10 supplies power to the upper portion (first portion 191) of the slit St and the lower portion (second portion 192) of the slit St.

Specifically, the taper slot antenna 10 further includes a feeding unit 194. The power feeding unit 194 supplies power by applying a first potential to the first portion 191 and a second potential lower than the first potential to the second portion 192.

Since the tapered slot antenna 10 feeds the first tapered conductor 11 and the second tapered conductor 12 from one feeding unit 194, a distributor for feeding each tapered conductor is not required. As a result, the cost can be reduced as compared with the type of antenna in which power is supplied to a plurality of tapered conductors via a distributor.

The first tapered conductor 11, for example, from the tip P11f1 to the near end P11n of the first tapered conductor 11, and the second tapered conductor 12, for example, from the tip P12f1 to the near end P12n of the second tapered conductor 12. The shape may be curved or linear.

Further, the shapes of the first tapered conductor 11, for example, from the tip P11f1 to the near end P11n of the first tapered conductor 11 and from the tip P12f1 of the second tapered conductor 12 to the near end P12n of the second tapered conductor 12 are , A combination of a plurality of straight lines, a combination of a plurality of curves, and a combination of a plurality of straight lines and a plurality of curves.

That is, in FIG. 1A, the shape from the tip P11f1 to the near end P11n is described as a predetermined curved shape, but the shape is not limited thereto. For the shape from the tip P11f1 to the near end P11n, for example, a combination of a plurality of curves, an n-th order curve whose radius changes continuously (n is an integer of 1 or more), a hyperbola, a logarithmic curve, an exponential curve, etc. are used. It may be in shape. The same applies to the shape from the tip P12f1 to the near end P12n.

Further, the fourth side surface 11S4 of the first tapered conductor 11 may be composed of a curved surface or a plane, a surface in which a curved surface and a plane are combined, a surface in which one or more a plurality of curved surfaces and one or more a plurality of planes are combined, and the like. ..

The second tapered conductor 12 may have a shape symmetrical to that of the first tapered conductor 11 when viewed from a direction perpendicular to the central conductor 19.

Further, as shown in FIG. 1B, each of the first tapered conductor 11 and the second tapered conductor 12 of the tapered slot antenna 10a may be formed of a polyhedron. The polyhedron may be, for example, a flat polyhedron. The fourth side surface 11S4 side of the first tapered conductor 11 may have a concave shape. Specifically, the first tapered conductor 11 has a third side surface 11S3 that intersects the direction from the second portion 192 to the first portion 191. The distance between the coupling point P11c that couples with the first portion 191 of the third side surface 11S3 and the side f12 that faces the coupling point P11c is defined as the distance Lcf. The distance between the coupling point P11c and the first tip P11f1 close to the first side surface 11S1 of the first tapered conductor 11 is defined as the distance L11. At this time, the distance Lcf is shorter than the distance L11. The distance between the coupling point P11c and the second tip P11f2 near the second side surface 11S2 of the first tapered conductor 11 is defined as the distance L12. At this time, the distance Lcf is shorter than the distance L12. The same applies to the second tapered conductor 12.

As described above, in the tapered slot antenna 10a, the shape of the side f12 facing the coupling point P11c of the first tapered conductor 11 is not constant, and a recess is provided in the central portion, and the second tapered conductor 12 has the same shape. .. As a result, the distance between the first tapered conductor 11 and the second tapered conductor 12 arranged above and below varies. By providing the central portion with a dent, the distance between the first tapered conductor 11 and the second tapered conductor 12 in the central portion becomes longer than in the case where there is no dent. By forming such a recessed shape, as shown in FIG. 3E, it becomes easy to distribute the current to both ends of the first tapered conductor 11 and the second tapered conductor 12. As a result, it is possible to obtain the effect that the beam width of the directivity of the antenna can be kept more constant as compared with the case where there is no dent.

As shown in FIG. 1A, when the distance between the coupling point P11c and the side f12 is constant, that is, when the distance is constant in the circumferential direction, the shape of the antenna is, in principle, a partial biconical antenna. It becomes close to the shape cut out. In this case, the effect of strongly distributing the current at both ends as shown in FIG. 3E is smaller than that of the antenna having a recess in the central portion.

The operation of the tapered slot antenna will be described.
First, as a basic operation, the operation of a tapered slot antenna composed of a first tapered conductor and a second tapered conductor, which are not wide structures, will be described.

FIG. 2A is a schematic diagram illustrating the operation of the tapered slot antenna.
FIG. 2A shows the currents at low frequencies in the first tapered conductor and the second tapered conductor. The arrow shown in FIG. 2A indicates the current flow.
FIG. 2B is a schematic diagram illustrating the directivity of the antenna shown in FIG. 2A.

FIG. 2C is a schematic diagram illustrating the operation of the tapered slot antenna.
FIG. 2C shows the currents at high frequencies in the first tapered conductor and the second tapered conductor. The arrows shown in FIG. 2C indicate the current flow.
FIG. 2D is a schematic diagram illustrating the directivity of the antenna shown in FIG. 2C.

As shown in FIG. 2A, at low frequencies, the current is distributed long at the ends of the first tapered conductor and the second tapered conductor due to the long wavelength. The radio wave is radiated in the directivity as shown in FIG. 2B from the point of the _{distance R WSA-L} from the power feeding unit.

As shown in FIG. 2C, since the wavelength is short in the high frequency range, the maximum points of a plurality of currents are distributed and the phases are alternately inverted. Since the amplitude of the current is the largest in the part closest to the feeding part, the center of radio wave radiation is generally near the maximum value of the current closest to the feeding part, that is, the distance R _TSA-H from the feeding part. Radio waves are emitted from the point.

As shown in FIG. 2D, the directivity in this case is that currents having a plurality of maximum values are alternately distributed in phase inversion at the end of the first taper conductor and the end of the second taper conductor. Since it is formed by a combined electric field, the beam width is narrow and it becomes complicated with many high side lobes. As described above, the directivity of the tapered slot antenna composed of the first tapered conductor and the second tapered conductor fluctuates according to the change in frequency, and the higher the frequency, the narrower the beam width.

Next, the operation of the tapered slot antenna according to the first embodiment will be described.
FIG. 3A is a schematic view illustrating the operation of the tapered slot antenna according to the first embodiment.
FIG. 3A shows the currents at low frequencies in the first tapered conductor and the second tapered conductor according to the first embodiment. The arrow shown in FIG. 3A indicates the flow of current.
FIG. 3B is a schematic diagram illustrating the operation of the tapered slot antenna according to the first embodiment.
FIG. 3B shows the currents at low frequencies in the first tapered conductor and the second tapered conductor according to the first embodiment. The arrows shown in FIG. 3B indicate the flow of current.
FIG. 3C is a schematic diagram illustrating the directivity of the antenna shown in FIGS. 3A and 3B.

FIG. 3D is a schematic diagram illustrating the operation of the tapered slot antenna according to the first embodiment.
FIG. 3D shows the currents at high frequencies in the first tapered conductor and the second tapered conductor according to the first embodiment. The arrows shown in FIG. 3D indicate the current flow.
FIG. 3E is a schematic view illustrating the operation of the tapered slot antenna according to the first embodiment.
FIG. 3E shows the currents at low frequencies in the first tapered conductor and the second tapered conductor according to the first embodiment. The arrows shown in FIG. 3E indicate the current flow.
FIG. 3F is a schematic diagram illustrating the directivity of the antenna shown in FIGS. 3D and 3E.

As shown in FIG. 3A, since the wavelength is long at low frequencies, the current is distributed long at the end of the first tapered conductor 11 and the end of the second tapered conductor 12. Radio waves are radiated from a point at a _{distance R WTSA-L} from the power feeding unit 194.

In this case, as shown in FIGS. 3A and 3B, the current strongly flows through the fan-shaped ends of the first tapered conductor 11 and the second tapered conductor 12. Therefore, as shown in FIG. 3C, the directivity of the tapered slot antenna 10 is the synthesis of radiation from two places _{whose distances (intervals) are separated by the distance D WTSA-L.} Therefore, the directivity of the tapered slot antenna 10 has a slightly narrower beam width than that of the antennas of FIGS. 2A and 2B. Since the directivity of the tapered slot antenna 10 can be considered as a two-element array antenna, it has a broad directivity as shown in FIG. 3C.

As shown in FIG. 3D, since the wavelength is short in the high frequency range, the maximum points of a plurality of currents are distributed and the phases are alternately inverted. The amplitude of the current is largest in the portion closest to the feeding portion 194. Therefore, the radio wave is generally radiated from the vicinity of the maximum value of the current closest to the power feeding unit 194, that is, from the point of the _{distance R WTSA-H from the power feeding unit 194.}

In this case, as shown in FIGS. 3D and 3E, the current strongly flows through the fan-shaped ends of the first tapered conductor 11 and the second tapered conductor 12. Therefore, as shown in FIG. 3F, the directivity of the tapered slot antenna 10 is the synthesis of radiation from two places _{whose distances (intervals) are separated by the distance D WTSA-H.} The directivity in this case is also affected by the electric field due to the distribution of multiple currents due to the short wavelength as shown in FIGS. 3A and 3B, but the radiation from two places separated by the _{distance D WTSA-H is emitted.} First and more affected. Therefore, the shape of the directivity is determined by the combination of the two. Therefore, the directivity at high frequencies may also be considered as a two-element array antenna.

Here, the relationship of low frequency wavelength> high frequency wavelength, distance R _WTSA-L > distance R _WTSA-H , and distance D _WTSA-L > distance D _WTSA-H is established. Then, the low frequency wavelength and the high frequency wavelength, the distance R _WTSA-L and the distance R _WTSA-H , and _{the relationship between the distance D WTSA-L} and the distance D _WTSA-H are proportional or close to each other. If it is related, the directivity and its beam width are close to each other regardless of the frequency.

For example, when the low frequency is 1 GHz (gigahertz), the wavelength is 30 cm (centimeter). _{Assuming that the} distance D WTSA-L is 15 cm, 30 cm / 15 cm = 0.5 wavelength. Therefore, the directivity shown in FIG. 3C is close to the directivity of an array antenna having two elements and an antenna element spacing of 0.5 wavelength.

On the other hand, when the high frequency is 3 GHz, which is three times the low frequency of 1 GHz, the wavelength is 10 cm. Since the relationship between the distance R _WTSA-L and the distance R _WTSA-H is substantially proportional to the wavelength, the distance R _WTSA-H is 1/3 of the distance R _{WTSA-L. The triangle T WTSA-L} shown in FIG. 3C and the _{triangle T WTSA-H} shown in FIG. 3F have a similar relationship, and the ratio relationship between _{the distance R WTSA-L} and the distance R _{WTSA-H is the distance D WTSA-L} and the distance D. It is almost the same as the ratio relationship of _WTSA-H. Therefore, the distance D _WTSA-H is also _{1/3 of the distance D WTSA-L} , and the distance D _WTSA-H = 15 cm / 3 = 5 cm.

At this time, the distance D _WTSA-H is 10 cm / 5 cm = 0.5 wavelength in terms of wavelength, and even if the frequency is tripled, the array antenna is a two-element antenna with an element spacing of 0.5 wavelength. Directionality is formed.

As described above, if _{the relationship between the distance R WTSA-L} and the distance R _WTSA-H is proportional to or close to the relationship between the distance D _WTSA-L and the distance D _{WTSA-H, the directivity formed is formed.} Is equal to or close to a two-element array antenna, regardless of frequency.

Next, the effect of the tapered slot antenna according to the first embodiment will be described with reference to the simulation results.
FIG. 4A is a perspective view illustrating a simulation model of the tapered slot antenna according to the first embodiment.
The angle between the first side surface and the second side surface of the first taper conductor is 31.9 degrees.
FIG. 4B is a perspective view illustrating a simulation model of the tapered slot antenna according to the comparative example of the first embodiment.
The tapered slot antenna according to the comparative example uses a thin plate instead of the wide structure. The tapered slot antenna according to the comparative example does not have a wide structure.

FIG. 4C is a graph illustrating the matching characteristics in the simulation model shown in FIG. 4A.
The horizontal axis of FIG. 4C shows the frequency, and the vertical axis shows the absolute value | S11 | of the reflection coefficient S11. The unit is dB (decibel).

As shown in FIG. 4C, in a wide band of frequencies from 1.1 GHz to 5.5 GHz and 6.8 GHz or more, the absolute value | S11 | of the reflectance coefficient is −6 dB or less. The value that the absolute value | S11 | of the reflectance coefficient is -6 dB or less is 3.0 or less when converted to the voltage standing wave ratio (VSWR) indicating good matching, and is at least the above band (from 1.1 GHz). It can be seen that good matching is obtained at 5.5 GHz and 6.8 GHz or higher).

FIG. 4D is a graph illustrating the directivity characteristics of the simulation model shown in FIG. 4A and the directivity characteristics of the simulation model shown in FIG. 4B.
FIG. 4D shows a three-dimensional directivity characteristic, and shows a three-dimensional directivity characteristic including an azimuth direction plane (AZ direction plane) and an elevation angle direction plane (EL direction plane).

As shown in FIG. 4D, in the taper slot antenna according to the comparative example, the main beam becomes narrower (thinner) as the frequency increases in terms of the characteristics in the AZ plane. On the other hand, the tapered slot antenna according to the first embodiment maintains a constant beam width without narrowing the main beam even if the frequency becomes high in the characteristics in the AZ plane.

FIG. 4E is a graph illustrating the directivity characteristics in the AZ plane at a frequency of 7 GHz.
The horizontal axis of FIG. 4E indicates the angle from the maximum gain direction, and the unit is degree. The vertical axis of FIG. 4E shows the gain, and the unit is dBi.
The solid line shown in FIG. 4E shows the gain of the tapered slot antenna according to the first embodiment, and the dotted line shows the gain of the tapered slot antenna according to the comparative example.

As shown in FIG. 4E, the -10 dB beam width in the directional gain of the taper slot antenna according to the comparative example is 40 degrees. On the other hand, the -10 dB beam width in the directional gain of the tapered slot antenna according to the first embodiment is 64 degrees, and a beam width 1.6 times as large as that of the tapered slot antenna according to the comparative example can be obtained. ..

The tapered slot antenna according to the first embodiment can obtain the following effects as compared with the tapered slot antenna according to the comparative example.
-The matching characteristics are wide band. That is, the input impedance characteristic is wide band.
-The change in directivity characteristics (radiation pattern characteristics) is small with respect to frequency changes. In particular, it is possible to obtain a beam width with little change in the beam width and little fluctuation in a wide frequency band. Also, the beam width is wide.

Further, as shown in FIGS. 1A and 1B, the tapered slot antenna 10 according to the first embodiment feeds power from one feeding unit 194 to a plurality of tapered conductors (first tapered conductor 11 and second tapered conductor 12). .. That is, the tapered slot antenna 10 does not require a distributor for feeding power to each tapered conductor, and one feeding unit 194 can be used in common. As a result, the cost of the tapered slot antenna 10 can be reduced as compared with an antenna of a type in which power is supplied to a plurality of tapered conductors via a distributor.

As a result, according to the first embodiment, there is provided a tapered slot antenna having a wide beam width, a wide beam characteristic, a wide band characteristic with little frequency change, and a wide structure capable of reducing the cost at high frequencies. can do.

Further, since the tapered slot antenna 10 has a recess in the central portion of the upper and lower tapered conductors (see FIG. 1A), the beam width of the directivity characteristic can be kept more constant than in the case where there is no recess. There is an effect.

Here, the features of the tapered slot antenna 10 will be described below.
The tapered slot antenna 10 has a first tapered conductor 11 and a second tapered conductor 12 having fourth side surfaces (radiating surface plates) facing each other, that is, the fourth side surface 11S4 and the fourth side surface 12S4 facing each other in a short distance. A central conductor 19 for joining the 1-tapered conductor 11 and the second tapered conductor 12 is provided.
The distance between the first tapered conductor 11 and the second tapered conductor 12 facing each other in the vertical direction gradually widens and increases toward the tip.
The width of the first tapered conductor 11 in the left-right direction gradually expands and increases toward the tip. This is called a wide structure.
The central conductor 19 has a substantially U-shaped slit St for supplying power.
The first tapered conductor 11 and the upper portion of the slit St of the central conductor 19 are joined, and the second tapered conductor 12 and the lower portion of the slit St of the central conductor 19 are joined.
Power is supplied to the upper portion of the slit St of the central conductor 19 and the lower portion of the slit St.
The first tapered conductor is referred to as an upper conductor, and the second tapered conductor is referred to as a lower conductor.
By having the above configuration, the taper slot antenna 10 has a wide band matching characteristic, and its directivity also has a small fluctuation with respect to a frequency change. In particular, the beam width does not narrow from a low region to a high region. It has the effect of being maintained.
When there is a dent in the central portion of the upper and lower tapered conductors of the tapered slot antenna 10, the beam width of the directivity can be kept more constant.

[Embodiment 2]
FIG. 5 is a perspective view illustrating the tapered slot antenna 20 according to the second embodiment.

As shown in FIG. 5, the tapered slot antenna 20 according to the second embodiment has a first side surface 21S1, a second side surface 21S2, a third side surface 21S3, and a fourth side surface 21S3 as compared with the tapered slot antenna 10 according to the first embodiment. The difference is that the shapes of the side surface 21S4, the first side surface 22S1, the second side surface 22S2, the third side surface 22S3, and the fourth side surface 22S4 are triangular.

In particular, since the third side surface 21S3 and the fourth side surface 21S4 of the first tapered conductor 21 and the third side surface 22S3 and the fourth side surface 22S4 of the second tapered conductor 22 are triangular rather than fan-shaped, the tapered slot antenna 10a ( The same effect as (see FIG. 1B) can be obtained. Since the third side surface 21S3 and the third side surface 22S3 are triangular, the current can be more easily distributed to both ends of the third side surface 21S3 and the third side surface 22S3 as compared with the case where the third side surface 21S3 and the third side surface 22S3 are fan-shaped (FIG. 3E). reference). The reason for this is that the triangle is the distance between the fourth side surface 21S4 and the fourth side surface 22S4 when the fourth side surface 21S4 and the fourth side surface 22S4 are viewed from the center conductor 29 side (the distance between the fourth side surface 21S4 and the fourth side surface 22S4). ) Is small and the current is difficult to distribute. When the central conductor 29 made of a conductor has a thickness, the shapes of the third side surface 21S3, the fourth side surface 21S4, the third side surface 22S3, and the fourth side surface 22S4 are trapezoidal.

[Embodiment 3]
FIG. 6 is a perspective view illustrating the tapered slot antenna 30 according to the third embodiment.
As shown in FIG. 6, the tapered slot antenna 30 according to the third embodiment has a fourth side surface 31S4 and a second side surface 31S4 of the first tapered conductor 31 which is a radial surface, as compared with the tapered slot antenna 10 according to the first embodiment. The difference is that the fourth side surface 32S4 of the tapered conductor 32 is formed of a composite surface obtained by combining a plurality of surfaces.

In the example shown in FIG. 6, the first tapered conductor 31 and the second tapered conductor 32 are composed of a plurality of planes and curved surfaces. Specifically, the fourth side surface 31S4, which is the radio wave emitting surface of the first tapered conductor 31, is composed of a flat surface 31S41, a flat surface 31S42, a flat surface 31S43, and a curved surface 31S44. The fourth side surface 32S4, which is the radio wave emitting surface of the second tapered conductor 32, is composed of a flat surface 32S41, a flat surface 32S42, a flat surface 32S43, and a curved surface 32S44.

That is, each of the first tapered conductor 31 and the second tapered conductor 32 is composed of a three-dimensional shape including a plurality of curved surfaces.

The first tapered conductor 31 and the second tapered conductor 32, which are radiating conductors facing the top and bottom of the tapered slot antenna 30, may have an asymmetric structure. That is, the second tapered conductor 32 may have a shape asymmetrical with that of the first tapered conductor 31 when viewed from the direction perpendicular to the central conductor 39. When the first tapered conductor 31 and the second tapered conductor 32 have an asymmetric structure, for example, the first tapered conductor 11 shown in FIG. 1A and the second tapered conductor 32 shown in FIG. 6 may be combined. When the tapered conductors are combined in this way, the length L shown in FIG. 6 is set to be substantially the same length as before the combination, so that no beam shift occurs in the elevation plane and the beam width in the directional direction. Can be maintained.

[Embodiment 4]
FIG. 7 is a perspective view illustrating the tapered slot antenna according to the fourth embodiment.
As shown in FIG. 7, the tapered slot antenna 40 according to the fourth embodiment has a circular hollow portion Ste in the short-circuited portion 491 after passing through the slit St as compared with the tapered slot antenna 10 according to the first embodiment. The difference is that they are short-circuited through.

Specifically, the slit St of the tapered slot antenna 40 further extends in the direction toward the short-circuit portion 491. The extended portion (hollowed portion Ste) of the slit St has a predetermined shape when viewed from a direction perpendicular to the central conductor 49. The predetermined shape is, for example, a circular shape.

The shape of the hollowed-out portion Ste is not limited to a circle, and may be composed of, for example, an ellipse or a combination of a plurality of arcs.

[Embodiment 5]
FIG. 8 is a perspective view illustrating the tapered slot antenna according to the fifth embodiment.
As shown in FIG. 8, the tapered slot antenna 50 according to the fifth embodiment has a different shape of the hollowed-out Ste from the tapered slot antenna 40 according to the fourth embodiment. Specifically, the shape of the hollow portion Ste is, for example, a fan shape when viewed from the direction perpendicular to the central conductor 59.

The shape of the hollow portion Ste is not limited to a circle or a fan shape, and may be any shape, for example, a polygon or a shape in which a polygon and an arc are combined.

[Embodiment 6]
FIG. 9 is a perspective view illustrating the tapered slot antenna according to the sixth embodiment.
As shown in FIG. 9, the tapered slot antenna 60 according to the sixth embodiment has a slit St of the first tapered conductor 61 from the tip P61f1 of the first tapered conductor 61 as compared with the tapered slot antenna 20 according to the second embodiment. The length to the end P61n near is short. For example, the length Lnf from the tip P61f1 to the near end P61n is shorter than the predetermined length Lp. The same applies to the second tapered conductor 62.

That is, the taper slot antenna 60 has a central conductor 69 having a tapered portion that gradually expands vertically, and a first tapered conductor 61 and a second tapered conductor 62 that face each other vertically at the tips of the upper and lower tapered portions. ..

In the tapered slot antenna 60 shown in FIG. 9, the first tapered conductor 61 and the second tapered conductor 62 are shown as polyhedra, but the present invention is not limited to this. Each of the first tapered conductor 61 and the second tapered conductor 62 may be composed of a combination of a polyhedron and a three-dimensional shape including a plurality of curved surfaces. Further, the first tapered conductor 61 and the second tapered conductor 62 may be formed by a combination of one or more planes and curved surfaces. Further, the tapered portion may be formed by a combination of a straight line, a curved line, or one or more straight lines and a curved line.

[Embodiment 7]
FIG. 10 is a perspective view illustrating the tapered slot antenna according to the seventh embodiment.
As shown in FIG. 10, the tapered slot antenna 70 according to the seventh embodiment has a shape of the first side surface 71S1 and the second side surface 72S2 of the first tapered conductor 71 as compared with the tapered slot antenna 10 according to the first embodiment. However, the difference is that the shape is substantially U-shaped when viewed from the direction from the second tapered conductor 72 to the first tapered conductor 71.

Further, the tapered slot antenna 70 is joined to the central conductor 79 at substantially the apex of the first tapered conductor 71 and the second tapered conductor 72 in a substantially U shape. The shapes of the first side surface 71S1 and the second side surface 72S2 of the first taper conductor 71 when viewed from the direction from the second taper conductor 72 to the first taper conductor 71 are not limited to a substantially U shape, but are linear. It may be substantially V-shaped.

Further, each of the fourth side surface 71S4 of the first tapered conductor 71 and the fourth side surface 72S4 of the second tapered conductor 72, which are radiation surfaces of radio waves, is a curved surface or a flat surface, or a combination of a curved surface and a flat surface, and one or more curved surfaces. And one or more planes may be combined. In particular, in the case of a curved surface, the shape of the fourth side surface 71S4 of the first tapered conductor 71 in the cross section including the direction from the second portion 792 to the first portion 791 is a circle, an ellipse, or an m-th order function (m is It may be composed of an ellipse of 1 or more), an exponential function, a logarithmic curve, or the like. The same applies to the fourth side surface 72S4 of the second tapered conductor 72.

[Embodiment 8]
FIG. 11 is a perspective view illustrating the tapered slot antenna according to the eighth embodiment.
As shown in FIG. 11, in the tapered slot antenna 80 according to the eighth embodiment, each of the first tapered conductor 81 and the second tapered conductor 82, which are radio wave emitting elements, is formed of a flat polyhedron.

Specifically, the first tapered conductor 81 is composed of the first side surface 81S1 (side plate 81a), the second side surface 81S2 (side plate 81b), the third side surface 81S3 (bottom plate 81c), and the fourth side surface 81S4 (radiating surface plate 81d). It is composed. Further, the fourth side surface 81S4 is composed of a surface 81S41 and a surface 81S42.

The second tapered conductor 82 is composed of a first side surface 82S1 (side plate 82a), a second side surface 82S2 (side plate 82b), a third side surface 82S3 (bottom plate 82c), and a fourth side surface 82S4 (radiating surface plate 82d). The fourth side surface 82S4 is composed of a surface 82S41 and a surface 82S42.

In the tapered slot antenna 80, the shape of the upper and lower radiating elements (tapered conductors) in the circumferential direction is not constant, and the central portion protrudes between the upper and lower radiating elements (first tapered conductor 81 and second tapered conductor 82). The distance fluctuates, especially in the central part.

Specifically, the distance between the coupling point P81c of the first tapered conductor 81 and the tip P81f1 of the first tapered conductor 81 is the coupling point P81c of the first tapered conductor 81 and another tip P81f3 of the first tapered conductor 81. Shorter than the distance between. Further, the distance between the coupling point P81c of the first tapered conductor 81 and the further tip P81f2 of the first tapered conductor 81 is the coupling point P81c of the first tapered conductor 81 and another tip P81f3 of the first tapered conductor 81. Shorter than the distance between. As a result, the distance between the first tapered conductor 81 and the second tapered conductor 82 of the tapered slot antenna 80 varies more than in the case of the tapered slot antenna 50.

As described above, the taper slot antenna 80 has a structure in which the shape of the upper and lower radiating elements in the circumferential direction is not constant, the central portion protrudes, and the distance between the upper and lower radiating elements fluctuates. As a result, even when the current is distributed too strongly at the coupling portions (both ends) of the tapered conductor (see FIG. 3E), the current distribution can be distributed to the central portion and the beam width of the radio wave can be adjusted.

[Embodiment 9]
FIG. 12 is a perspective view illustrating the tapered slot antenna according to the ninth embodiment.
As shown in FIG. 12, the taper slot antenna 90 according to the ninth embodiment has a thickness t of the central conductor 99 in the direction perpendicular to the central conductor 99 as compared with the tapered slot antenna 20 according to the second embodiment. The difference is that it is a three-dimensional structure having a certain thickness, that is, a predetermined thickness t.

In the taper slot antenna 90, the central conductor 99 has a thickness t, so that the slit St also has a thickness t. By giving the slit St a thickness, the short-circuit location of the current becomes various. That is, the current can be short-circuited in various paths. The high-frequency current input from the power feeding unit 994 is short-circuited at the center of the left wall surface of the slit St, at the back end, and at the front end. The passage length from the power supply position to the short-circuit position is different. As a result, since there are a plurality of passage lengths, the impedance matching can be widened. On the contrary, when the thickness of the central conductor 99 is thin, the thickness of the slit St is also thin, and it is difficult to widen the impedance matching.

The thickness t in the direction perpendicular to the central conductor 99 may be, for example, one tenth or less of the wavelength of the minimum operating frequency used in the tapered slot antenna 90.

[Embodiment 10]
FIG. 13 is a perspective view illustrating the tapered slot antenna according to the tenth embodiment.
As shown in FIG. 13, the tapered slot antenna 100 according to the tenth embodiment is different from the tapered slot antenna 90 according to the ninth embodiment in that the thickness in the direction perpendicular to the central conductor 109 is not constant. ..

For example, the thickness t1 of the surface 109S1 connected to the first tapered conductor 101 of the central conductor 109 and the thickness t2 of the surface 109S2 opposite to the side connected to the first tapered conductor 101 of the central conductor 109 are different.

Note that FIG. 13 illustrates a case where the thickness of the central conductor 109 changes linearly, but the present invention is not limited to this. The thickness of the central conductor 109 may be changed in a curved line.

[Embodiment 11]
FIG. 14 is a perspective view illustrating the tapered slot antenna according to the eleventh embodiment.
As shown in FIG. 14, in the tapered slot antenna 110 according to the eleventh embodiment, the first side surface 111S1, the second side surface 111S2, and the fourth side surface 111S4 of the first taper conductor 111, which is a radio wave radiating element, are trapezoidal. ing. The same applies to the second tapered conductor 112. The side surface of the central conductor 119 is also trapezoidal. Each of the first tapered conductor 111, the second tapered conductor 112, and the central conductor 119 has a shape in which the tip portion (the portion including the apex where the four sides are connected) is deleted from the square pyramid.

[Embodiment 12]
FIG. 15 is a perspective view illustrating the tapered slot antenna according to the twelfth embodiment.
As shown in FIG. 15, the tapered slot antenna 120 according to the twelfth embodiment has a conductor and a dielectric in a direction other than the main beam direction of the radio wave radiated by the antenna as compared with the tapered slot antenna 20 according to the second embodiment. The difference is that it is covered with a body or a wall formed of a conductive material containing a conductor and a dielectric.

Specifically, the side surface of the tapered slot antenna 120 excluding the radiation direction is covered with the side wall plate 1211, the side wall plate 1212, the upper wall plate 1213, the bottom wall plate 1214, and the back wall plate 1215. The side wall plate 1211, the side wall plate 1212, the upper wall plate 1213, the bottom wall plate 1214, and the back wall plate 1215 may be formed of, for example, a conductor. Further, the side wall plate 1211, the side wall plate 1212, the upper wall plate 1213, the bottom wall plate 1214, and the back wall plate 1215 may be formed of, for example, a dielectric or a combination of a conductor and a dielectric. Further, the side wall plate 1211, the side wall plate 1212, the upper wall plate 1213, the bottom wall plate 1214, and the back wall plate 1215 may be formed by, for example, a combination of a conductor rod or a conductor lattice and a dielectric.

[Embodiment 13]
FIG. 16 is a perspective view illustrating the orthogonal tapered slot antenna according to the thirteenth embodiment.
As shown in FIG. 16, the orthogonal tapered slot antenna 130 according to the thirteenth embodiment has the same shape as the first tapered slot antenna 131 and the second tapered slot antenna 20 as compared with the tapered slot antenna 20 according to the second embodiment. The difference is that the 132 is vertically and horizontally orthogonal to each other and is joined and arranged at the joining portion 133.

As each of the first tapered slot antenna 131 and the second tapered slot antenna 132, the same one as the tapered slot antenna 20 according to the second embodiment may be used.

Since the orthogonal tapered slot antenna 130 has two antennas, a first tapered slot antenna 131 and a second tapered slot antenna 132, arranged vertically and horizontally, two feeding portions (not shown) are required. Each of the first tapered slot antenna 131 and the second tapered slot antenna 132 can be used as a vertically polarized wave and a horizontally polarized band antenna.

Details of the orthogonal taper slot antenna 130 are described below.
The orthogonal taper slot antenna 130 includes a first taper slot antenna 131 and a second taper slot antenna 132.

The first tapered slot antenna 131 has a first antenna central conductor, a first antenna first tapered conductor, and a first antenna second tapered conductor.

The central conductor of the first antenna is the first antenna first portion that is coupled to the first antenna short-circuited portion, a part of the first antenna short-circuited portion, and the first antenna first portion that is coupled to another part of the first antenna short-circuited portion. It has two parts and. The central conductor of the first antenna has a substantially U-shape in which a first antenna slit is formed between the first portion of the first antenna and the second portion of the first antenna.

The first tapered conductor of the first antenna has a first side surface of the first antenna in a direction extending from the first portion of the first antenna and intersecting the extending direction. The first antenna first tapered conductor has a second side surface of the first antenna in a direction opposite to the intersecting direction. The first tapered conductor of the first antenna has a substantially triangular shape when viewed from the direction perpendicular to the central conductor of the first antenna.

The second tapered conductor of the first antenna extends from the second portion of the first antenna and has a substantially triangular shape when viewed from the direction perpendicular to the central conductor of the first antenna.

The distance between the extended tip of the first antenna first tapered conductor and the extended tip of the first antenna second tapered conductor is the end close to the first antenna slit of the first antenna first tapered conductor. It is longer than the distance between the first antenna and the second tapered conductor near the end of the first antenna slit.

The distance between the first side surface of the first antenna and the second side surface of the first antenna at the extended tip of the first taper conductor of the first antenna is the distance between the first side surface of the first antenna and the second side surface of the first antenna near the slit of the first antenna. 1 It is longer than the distance between the antenna and the second side surface.

The first tapered conductor of the first antenna has a third side surface of the first antenna that intersects the direction from the second portion of the first antenna to the first portion of the first antenna. The distance between the first antenna coupling point that couples with the first part of the first antenna on the third side surface of the first antenna and the side that faces the first antenna coupling point is the first antenna coupling point and the first antenna. It is shorter than the distance between the first tip of the first antenna near the first side surface of the first antenna of the first tapered conductor. The distance between the first antenna coupling point and the side facing the first antenna coupling point is the first antenna close to the first antenna coupling point and the first antenna second side surface of the first antenna first tapered conductor. It is shorter than the distance between the second tip and the tip.

The first taper slot antenna 131 supplies power to the first portion of the first antenna and the second portion of the first antenna.

The second tapered slot antenna includes a second antenna central conductor, a second antenna first tapered conductor, and a second antenna second tapered conductor.

The center conductor of the second antenna is a second antenna second antenna that is coupled to a second antenna short-circuited portion, a second antenna first portion that is coupled to a part of the second antenna short-circuited portion, and another part of the second antenna short-circuited portion. It has two parts and. The central conductor of the second antenna has a substantially U-shape in which a second antenna slit is formed between the first portion of the second antenna and the second portion of the second antenna.

The first tapered conductor of the second antenna has a first side surface of the second antenna in a direction extending from the first portion of the second antenna and intersecting the extending direction. The first tapered conductor of the second antenna has a second side surface of the second antenna in a direction opposite to the intersecting direction. The first tapered conductor of the second antenna has a substantially triangular shape when viewed from the direction perpendicular to the central conductor of the second antenna.

The second tapered conductor of the second antenna extends from the second portion of the second antenna and has a substantially triangular shape when viewed from the direction perpendicular to the central conductor of the second antenna.

The distance between the extended tip of the first tapered conductor of the second antenna and the extended tip of the second tapered conductor of the second antenna is the end close to the second antenna slit of the first tapered conductor of the second antenna. The distance between the second antenna and the end of the second tapered conductor near the second antenna slit is longer.

The distance between the first side surface of the second antenna and the second side surface of the second antenna at the extended tip of the first taper conductor of the second antenna is the distance between the first side surface of the second antenna and the second side surface near the slit of the second antenna. 2 It is longer than the distance between the antenna and the second side surface.

The first tapered conductor of the second antenna has a third side surface of the second antenna that intersects the direction from the second portion of the second antenna to the first portion of the second antenna. The distance between the second antenna coupling point that couples with the first part of the second antenna on the third side surface of the second antenna and the side facing the second antenna coupling point is the distance between the second antenna coupling point and the second antenna. It is shorter than the distance between the first tip of the second antenna near the first side surface of the second antenna of the first tapered conductor. The distance between the second antenna coupling point and the side facing the second antenna coupling point is the second antenna close to the second antenna coupling point and the second antenna second side surface of the second antenna first tapered conductor. It is shorter than the distance between the second tip and the tip.

The second taper slot antenna 132 supplies power to the first portion of the second antenna and the second portion of the second antenna.

The center conductor of the first antenna and the second antenna are orthogonal to each other so that the direction from the second part of the first antenna to the first part of the first antenna and the direction from the second part of the second antenna to the first part of the second antenna are orthogonal to each other. It intersects with the antenna center conductor.

[Embodiment 14]
FIG. 17 is a perspective view illustrating the orthogonal tapered slot antenna according to the fourteenth embodiment.
As shown in FIG. 17, in the orthogonal tapered slot antenna 140 according to the fourteenth embodiment, the first tapered slot antenna 141 and the second tapered slot antenna 142 radiate as compared with the orthogonal tapered slot antenna 130 according to the thirteenth embodiment. The difference is that the direction other than the main beam direction of the radio wave is covered with a wall formed of a conductor, a dielectric, or a conductive material containing the conductor and the dielectric.

Specifically, the side surface of the orthogonal tapered slot antenna 140 excluding the radiation direction is covered with the side wall plate 1411, the side wall plate 1412, the upper wall plate 1413, the bottom wall plate 1414, and the back wall plate 1415. The side wall plate 1411, the side wall plate 1412, the upper wall plate 1413, the bottom wall plate 1414, and the back wall plate 1415 may be formed of, for example, a conductor. Further, the side wall plate 1411, the side wall plate 1412, the upper wall plate 1413, the bottom wall plate 1414, and the back wall plate 1415 may be formed of, for example, a dielectric or a combination of a conductor and a dielectric. Further, the side wall plate 1411, the side wall plate 1412, the upper wall plate 1413, the bottom wall plate 1414, and the back wall plate 1415 may be formed by, for example, a combination of a conductor rod or a conductor lattice and a dielectric.

[Embodiment 15]
FIG. 18 is a perspective view illustrating the tapered slot antenna according to the fifteenth embodiment.
FIG. 18 shows a specific example of a power feeding method for the tapered slot antenna.
As shown in FIG. 18, the tapered slot antenna 150 according to the fifteenth embodiment electrically connects the first portion 1591 (the upper portion of the slit St) and the central conductor 1503 of the coaxial cable 1501. Further, the second portion 1592 (the portion below the slit St) and the outer conductor 1504 of the coaxial cable 1501 are electrically connected. In this way, power is supplied to the taper slot antenna 150. The connection is made by, for example, contact, soldering, screwing, or the like.

[Embodiment 16]
FIG. 19 is a perspective view illustrating the tapered slot antenna according to the sixteenth embodiment.
FIG. 19 illustrates a tapered slot antenna in which the central conductor 169 has a certain thickness.
FIG. 19 shows a specific example of a power feeding method for the tapered slot antenna.

As shown in FIG. 19, the tapered slot antenna 160 according to the 16th embodiment penetrates the second portion 1692 (inside the lower conductor) and passes the coaxial cable 1601. The central conductor 1603 is electrically connected to the first portion 1691 (upper side of the slit St) and the outer conductor 1604 is electrically connected to the second portion 1692 (lower side of the slit St). The connection is made by, for example, contact, soldering, screwing, or the like.

Even in the case of the tapered slot antenna 160 having a certain thickness in the central conductor 169, the connection as shown in FIG. 18 may be made.

[Embodiment 17]
FIG. 20 is a perspective view illustrating the tapered slot antenna according to the seventeenth embodiment.
As shown in FIG. 20, the taper slot antenna 170 has a structure in which a fan-shaped hollow portion Ste (also referred to as a fan-shaped slit) is horizontally provided at an end of a slit St provided in the central conductor 179. Specifically, the slit St further extends in the direction toward the short-circuit portion 1793. The shape of the hollowed-out portion Ste, which is an extended portion of the slit St, is a fan shape when viewed from the direction from the second portion 1792 to the first portion 1791.

The shape of the hollowed-out portion Ste shown in FIG. 20 is a horizontal direction of the fan-shaped hollowed-out portion (see FIG. 8) of the tapered slot antenna 50 according to the fifth embodiment. Therefore, by having the hollow portion Ste, the impedance matching of the antenna can be widened. The shape of the hollow portion Ste may be any shape such as a circular shape or an elliptical shape.

The present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit.

Some or all of the above embodiments may also be described, but not limited to:

Some or all of the above embodiments may also be described, but not limited to:
(Appendix 1)
It has a short-circuited portion, a first portion to be coupled to a part of the short-circuited portion, and a second portion to be coupled to another part of the short-circuited portion, and is between the first portion and the second portion. With a substantially U-shaped central conductor with a slit formed in
It extends from the first portion, has a first side surface in a direction intersecting the extending direction, has a second side surface in a direction opposite to the intersecting direction, and is substantially perpendicular to the central conductor. The first tapered conductor in the shape of a triangle,
A second tapered conductor extending from the second portion and having a substantially triangular shape when viewed from a direction perpendicular to the central conductor,
With
The distance between the extended tip of the first tapered conductor and the extended tip of the second tapered conductor is the distance between the end of the first tapered conductor near the slit and the second tapered conductor. Longer than the distance to the end near the slit,
The distance between the first side surface and the second side surface at the extended tip of the first tapered conductor is greater than the distance between the first side surface and the second side surface at the end close to the slit. Long,
The first tapered conductor has a third side surface that intersects the direction from the second portion to the first portion.
The distance between the coupling point that couples with the first portion of the third side surface and the side facing the coupling point is the first that is close to the coupling point and the first side surface of the first tapered conductor. Shorter than the distance between the tip and
The distance between the coupling point and the side facing the coupling point is shorter than the distance between the coupling point and the second tip near the second side surface of the first tapered conductor.
Power is supplied to the first portion and the second portion.
Wide structure taper slot antenna.
(Appendix 2)
The second tapered conductor has a shape symmetrical to that of the first tapered conductor when viewed from a direction perpendicular to the central conductor.
The wide-structured tapered slot antenna according to Appendix 1.
(Appendix 3)
The second tapered conductor has an asymmetrical shape with the first tapered conductor when viewed from a direction perpendicular to the central conductor.
The wide-structured tapered slot antenna according to Appendix 1.
(Appendix 4)
The first portion is further provided with a feeding portion that supplies power by applying a first potential to the first portion and a second potential lower than the first potential to the second portion.
The wide-structured tapered slot antenna according to any one of Appendix 1 to 3.
(Appendix 5)
The distance between the first tapered conductor and the second tapered conductor at the first predetermined distance from the near end of the first tapered conductor is also longer than the first predetermined distance from the near end of the first tapered conductor. It is shorter than the distance between the first tapered conductor and the second tapered conductor at the second predetermined distance.
The wide-structured tapered slot antenna according to any one of Appendix 1 to 4.
(Appendix 6)
The shape from the tip of the first taper conductor to the near end of the first taper conductor and from the tip of the second taper conductor to the near end of the second taper conductor is curved or curved. , Straight line,
The wide-structured tapered slot antenna according to any one of Appendix 1 to 5.
(Appendix 7)
Each shape from the tip of the first taper conductor to the near end of the first taper conductor and from the tip of the second taper conductor to the near end of the second taper conductor is a plurality of straight lines. The shape is one of a combination, a combination of a plurality of curves, and a combination of a plurality of straight lines and a plurality of curves.
The wide-structured tapered slot antenna according to any one of Appendix 1 to 5.
(Appendix 8)
The slit further extends in the direction toward the short-circuited portion.
The wide-structured tapered slot antenna according to any one of Appendix 1 to 7.
(Appendix 9)
The extended portion of the slit has a predetermined shape when viewed from a direction perpendicular to the central conductor.
The wide-structured tapered slot antenna according to Appendix 8.
(Appendix 10)
The predetermined shape is a circular shape or a fan shape.
The wide-structured tapered slot antenna according to Appendix 9.
(Appendix 11)
The length from the tip of the first tapered conductor to the near end of the first tapered conductor is shorter than a predetermined length.
The wide-structured tapered slot antenna according to any one of Appendix 1 to 10.
(Appendix 12)
Each of the first tapered conductor and the second tapered conductor is composed of a polyhedron.
The wide-structured tapered slot antenna according to any one of Supplementary note 1 to 11.
(Appendix 13)
Each of the first tapered conductor and the second tapered conductor is composed of a three-dimensional shape including a plurality of curved surfaces.
The wide-structured tapered slot antenna according to any one of Supplementary note 1 to 11.
(Appendix 14)
Each of the first tapered conductor and the second tapered conductor is composed of a combination of a polyhedron and a three-dimensional shape including a plurality of curved surfaces.
The wide-structured tapered slot antenna according to any one of Supplementary note 1 to 11.
(Appendix 15)
The thickness in the direction perpendicular to the central conductor has a predetermined thickness.
The wide-structured tapered slot antenna according to any one of Appendix 1 to 14.
(Appendix 16)
The slit further extends in the direction toward the short-circuited portion.
The extended portion of the slit has a circular shape, an elliptical shape, or a fan shape when viewed from the second portion toward the first portion.
The wide-structured tapered slot antenna according to Appendix 15.
(Appendix 17)
Power is supplied to the self-tapered slot antenna by connecting the first portion and the central conductor of the coaxial cable and electrically connecting the second portion and the outer conductor of the coaxial cable.
The wide-structured tapered slot antenna according to any one of Appendix 1 to 16.
(Appendix 18)
The angle formed by the first side surface of the first tapered conductor and the second side surface of the first tapered conductor when viewed from the second portion toward the first portion is 29 degrees or more and 35 degrees or less. ,
The wide-structured tapered slot antenna according to any one of Appendix 1 to 17.
(Appendix 19)
It has a short-circuited portion, a first portion to be coupled to a part of the short-circuited portion, and a second portion to be coupled to another part of the short-circuited portion, and is between the first portion and the second portion. With a substantially U-shaped central conductor with a slit formed in
It extends from the first portion, has a first side surface in a direction intersecting the extending direction, has a second side surface in a direction opposite to the intersecting direction, and is substantially perpendicular to the central conductor. The first tapered conductor in the shape of a triangle,
A second tapered conductor extending from the second portion and having a substantially triangular shape when viewed from a direction perpendicular to the central conductor,
With
The distance between the extended tip of the first tapered conductor and the extended tip of the second tapered conductor is the distance between the end of the first tapered conductor near the slit and the second tapered conductor. Longer than the distance to the end near the slit,
The distance between the first side surface and the second side surface at the extended tip of the first tapered conductor is greater than the distance between the first side surface and the second side surface at the end close to the slit. Long,
The first tapered conductor has a third side surface that intersects the direction from the second portion to the first portion.
The distance between the coupling point that couples with the first portion of the third side surface and the side facing the coupling point is the first that is close to the coupling point and the first side surface of the first tapered conductor. Shorter than the distance between the tip and
The distance between the coupling point and the side facing the coupling point is shorter than the distance between the coupling point and the second tip near the second side surface of the first tapered conductor.
Power is supplied to the first part and the second part.
The self-tapered slot antenna is covered with a wall formed of a conductor, a dielectric, or a conductive material containing the conductor and the dielectric in a direction other than the main beam direction of the radio wave radiated by the self-tapered slot antenna.
Wide structure taper slot antenna.
(Appendix 20)
It is equipped with a first taper slot antenna and a second taper slot antenna.
The first taper slot antenna is
A first antenna short-circuited portion, a first antenna first portion coupled with a part of the first antenna short-circuited portion, and a first antenna second portion coupled with another part of the first antenna short-circuited portion. A substantially U-shaped first antenna central conductor having a first antenna slit formed between the first portion of the first antenna and the second portion of the first antenna.
The first antenna extends from the first portion of the first antenna, has a first side surface of the first antenna in a direction intersecting the extending direction, and has a second side surface of the first antenna in a direction opposite to the intersecting direction. 1 The first antenna first taper conductor, which has a substantially triangular shape when viewed from the direction perpendicular to the center conductor of the antenna,
A first antenna second tapered conductor extending from the second portion of the first antenna and having a substantially triangular shape when viewed from a direction perpendicular to the center conductor of the first antenna.
With
The distance between the extended tip of the first antenna first tapered conductor and the extended tip of the first antenna second tapered conductor is determined by the first of the first antenna first tapered conductors. Longer than the distance between the end close to the antenna slit and the end of the first antenna second tapered conductor near the first antenna slit,
The distance between the first side surface of the first antenna and the second side surface of the first antenna at the extended tip of the first taper conductor of the first antenna is the first at the end close to the slit of the first antenna. Longer than the distance between the first side surface of the antenna and the second side surface of the first antenna,
The first antenna first tapered conductor has a third side surface of the first antenna that intersects the direction from the second portion of the first antenna toward the first portion of the first antenna.
The distance between the first antenna coupling point that couples with the first antenna first portion on the third side surface of the first antenna and the side that faces the first antenna coupling point is the same as the first antenna coupling point. , Shorter than the distance between the first tip of the first antenna near the first side surface of the first antenna of the first tapered conductor of the first antenna.
The distance between the first antenna coupling point and the side facing the first antenna coupling point is the distance between the first antenna coupling point and the first antenna second side surface of the first antenna first tapered conductor. Shorter than the distance between the second tip of the first antenna, which is close to
Power is supplied to the first portion of the first antenna and the second portion of the first antenna.
The second taper slot antenna is
A second antenna short-circuited portion, a second antenna first portion coupled to a part of the second antenna short-circuited portion, and a second antenna second portion coupled to another part of the second antenna short-circuited portion. A substantially U-shaped second antenna central conductor having a second antenna slit formed between the first portion of the second antenna and the second portion of the second antenna.
The second antenna extends from the first portion of the second antenna, has a first side surface of the second antenna in a direction intersecting the extending direction, and has a second side surface of the second antenna in a direction opposite to the intersecting direction. 2 The 2nd antenna 1st taper conductor, which has a substantially triangular shape when viewed from the direction perpendicular to the center conductor of the 2 antennas,
A second antenna second tapered conductor extending from the second portion of the second antenna and having a substantially triangular shape when viewed from a direction perpendicular to the center conductor of the second antenna.
With
The distance between the extended tip of the second antenna first tapered conductor and the extended tip of the second antenna second tapered conductor is determined by the distance between the extended tip of the second antenna first tapered conductor. Longer than the distance between the end near the antenna slit and the end of the second antenna second taper conductor near the second antenna slit,
The distance between the first side surface of the second antenna and the second side surface of the second antenna at the extended tip of the first taper conductor of the second antenna is the second at the end close to the slit of the second antenna. Longer than the distance between the first side surface of the antenna and the second side surface of the second antenna,
The second antenna first tapered conductor has a third side surface of the second antenna that intersects the direction from the second portion of the second antenna toward the first portion of the second antenna.
The distance between the second antenna coupling point that couples with the first portion of the second antenna on the third side surface of the second antenna and the side that faces the second antenna coupling point is the same as the second antenna coupling point. , Shorter than the distance between the first tip of the second antenna near the first side surface of the second antenna of the first tapered conductor of the second antenna.
The distance between the second antenna coupling point and the side facing the second antenna coupling point is the distance between the second antenna coupling point and the second antenna second side surface of the second antenna first tapered conductor. Shorter than the distance between the second tip of the second antenna, which is close to
Power is supplied to the first part of the second antenna and the second part of the front second antenna.
The first antenna so that the direction from the second part of the first antenna toward the first part of the first antenna and the direction from the second part of the second antenna toward the first part of the second antenna are orthogonal to each other. The center conductor and the center conductor of the second antenna intersect.
Wide structure orthogonal taper slot antenna.
(Appendix 21)
The self-tapered slot antenna is covered with a wall formed of a conductor, a dielectric, or a conductive material containing the conductor and the dielectric in a direction other than the main beam direction of the radio wave radiated by the self-tapered slot antenna.
The wide-structured orthogonal taper slot antenna according to Appendix 20.

10, 10a ... Tapered slot antenna 11 ... 1st tapered conductor 12 ... 2nd tapered conductor 19 ... Central conductor 191 ... 1st part 192 ... 2nd part 193 ... Short circuit part 194 ... Feeding part 1211, 1212 ... Side wall plate 1213 ... Above Wall plate 1214 ... Bottom wall plate 1215 ... Back wall plate 130 ... Orthogonal tapered slot antenna 131 ... First tapered slot antenna 132 ... Second tapered slot antenna 133 ... Joint part 1501 ... Coaxial cable 1503 ... Central conductor 1504 ... External conductor 11a, 11b ... Side plate 11c ... Bottom plate 11d ... Radial surface plate 11S1, 12S1 ... First side surface 11S2, 12S2 ... Second side surface 11S3, 12S3 ... Third side surface 11S4, 12S4 ... Fourth side surface P11f1, P11f2, P12f1, P12f2, P61f1 ... , P12n, P61n ... Near ends D1, D2, D1f, D1s, D1n ... Distance L1 ... First predetermined distance L2 ... Second predetermined distance L, Lnf ... Length Lp ... Predetermined length Lcf, L11, L12 ... Distance f12 ... Side St ... Slit Ste ... Hollowed out part t, t1, t2 ... Thickness θ1, θ2 ... Angle

Claims (10)

It has a short-circuited portion, a first portion to be coupled to a part of the short-circuited portion, and a second portion to be coupled to another part of the short-circuited portion, and is between the first portion and the second portion. With a substantially U-shaped central conductor with a slit formed in
It extends from the first portion, has a first side surface in a direction intersecting the extending direction, has a second side surface in a direction opposite to the intersecting direction, and is substantially perpendicular to the central conductor. The first tapered conductor in the shape of a triangle,
A second tapered conductor extending from the second portion and having a substantially triangular shape when viewed from a direction perpendicular to the central conductor,
With
The distance between the extended tip of the first tapered conductor and the extended tip of the second tapered conductor is the distance between the end of the first tapered conductor near the slit and the second tapered conductor. Longer than the distance to the end near the slit,
The distance between the first side surface and the second side surface at the extended tip of the first tapered conductor is greater than the distance between the first side surface and the second side surface at the end close to the slit. Long,
The first tapered conductor has a third side surface that intersects the direction from the second portion to the first portion.
The distance between the coupling point that couples with the first portion of the third side surface and the side facing the coupling point is the first that is close to the coupling point and the first side surface of the first tapered conductor. Shorter than the distance between the tip and
The distance between the coupling point and the side facing the coupling point is shorter than the distance between the coupling point and the second tip near the second side surface of the first tapered conductor.
Power is supplied to the first portion and the second portion.
Wide structure taper slot antenna. The second tapered conductor has a shape symmetrical to that of the first tapered conductor when viewed from a direction perpendicular to the central conductor.
The wide-structured tapered slot antenna according to claim 1. The second tapered conductor has an asymmetrical shape with the first tapered conductor when viewed from a direction perpendicular to the central conductor.
The wide-structured tapered slot antenna according to claim 1. The first portion is further provided with a feeding portion that supplies power by applying a first potential to the first portion and a second potential lower than the first potential to the second portion.
The wide-structured tapered slot antenna according to any one of claims 1 to 3. The distance between the first tapered conductor and the second tapered conductor at the first predetermined distance from the near end of the first tapered conductor is also longer than the first predetermined distance from the near end of the first tapered conductor. It is shorter than the distance between the first tapered conductor and the second tapered conductor at the second predetermined distance.
The wide-structured tapered slot antenna according to any one of claims 1 to 4. The slit further extends in the direction toward the short-circuited portion.
The wide-structured tapered slot antenna according to any one of claims 1 to 5. The thickness in the direction perpendicular to the central conductor has a predetermined thickness.
The wide-structured tapered slot antenna according to any one of claims 1 to 6. The angle formed by the first side surface of the first tapered conductor and the second side surface of the first tapered conductor when viewed from the second portion toward the first portion is 29 degrees or more and 35 degrees or less. ,
The wide-structured tapered slot antenna according to any one of claims 1 to 7. It has a short-circuited portion, a first portion to be coupled to a part of the short-circuited portion, and a second portion to be coupled to another part of the short-circuited portion, and is between the first portion and the second portion. With a substantially U-shaped central conductor with a slit formed in
It extends from the first portion, has a first side surface in a direction intersecting the extending direction, has a second side surface in a direction opposite to the intersecting direction, and is substantially perpendicular to the central conductor. The first tapered conductor in the shape of a triangle,
A second tapered conductor extending from the second portion and having a substantially triangular shape when viewed from a direction perpendicular to the central conductor,
With
The distance between the extended tip of the first tapered conductor and the extended tip of the second tapered conductor is the distance between the end of the first tapered conductor near the slit and the second tapered conductor. Longer than the distance to the end near the slit,
The distance between the first side surface and the second side surface at the extended tip of the first tapered conductor is greater than the distance between the first side surface and the second side surface at the end close to the slit. Long,
The first tapered conductor has a third side surface that intersects the direction from the second portion to the first portion.
The distance between the coupling point that couples with the first portion of the third side surface and the side facing the coupling point is the first that is close to the coupling point and the first side surface of the first tapered conductor. Shorter than the distance between the tip and
The distance between the coupling point and the side facing the coupling point is shorter than the distance between the coupling point and the second tip near the second side surface of the first tapered conductor.
Power is supplied to the first part and the second part.
The self-tapered slot antenna is covered with a wall formed of a conductor, a dielectric, or a conductive material containing the conductor and the dielectric in a direction other than the main beam direction of the radio wave radiated by the self-tapered slot antenna.
Wide structure taper slot antenna. It is equipped with a first taper slot antenna and a second taper slot antenna.
The first taper slot antenna is
A first antenna short-circuited portion, a first antenna first portion coupled with a part of the first antenna short-circuited portion, and a first antenna second portion coupled with another part of the first antenna short-circuited portion. A substantially U-shaped first antenna central conductor having a first antenna slit formed between the first portion of the first antenna and the second portion of the first antenna.
The first antenna extends from the first portion of the first antenna, has a first side surface of the first antenna in a direction intersecting the extending direction, and has a second side surface of the first antenna in a direction opposite to the intersecting direction. 1 The first antenna first taper conductor, which has a substantially triangular shape when viewed from the direction perpendicular to the center conductor of the antenna,
A first antenna second tapered conductor extending from the second portion of the first antenna and having a substantially triangular shape when viewed from a direction perpendicular to the center conductor of the first antenna.
With
The distance between the extended tip of the first antenna first tapered conductor and the extended tip of the first antenna second tapered conductor is determined by the first of the first antenna first tapered conductors. Longer than the distance between the end close to the antenna slit and the end of the first antenna second tapered conductor near the first antenna slit,
The distance between the first side surface of the first antenna and the second side surface of the first antenna at the extended tip of the first taper conductor of the first antenna is the first at the end close to the slit of the first antenna. Longer than the distance between the first side surface of the antenna and the second side surface of the first antenna,
The first antenna first tapered conductor has a third side surface of the first antenna that intersects the direction from the second portion of the first antenna toward the first portion of the first antenna.
The distance between the first antenna coupling point that couples with the first antenna first portion on the third side surface of the first antenna and the side that faces the first antenna coupling point is the same as the first antenna coupling point. , Shorter than the distance between the first tip of the first antenna near the first side surface of the first antenna of the first tapered conductor of the first antenna.
The distance between the first antenna coupling point and the side facing the first antenna coupling point is the distance between the first antenna coupling point and the first antenna second side surface of the first antenna first tapered conductor. Shorter than the distance between the second tip of the first antenna, which is close to
Power is supplied to the first portion of the first antenna and the second portion of the first antenna.
The second taper slot antenna is
A second antenna short-circuited portion, a second antenna first portion coupled to a part of the second antenna short-circuited portion, and a second antenna second portion coupled to another part of the second antenna short-circuited portion. A substantially U-shaped second antenna central conductor having a second antenna slit formed between the first portion of the second antenna and the second portion of the second antenna.
The second antenna extends from the first portion of the second antenna, has a first side surface of the second antenna in a direction intersecting the extending direction, and has a second side surface of the second antenna in a direction opposite to the intersecting direction. 2 The 2nd antenna 1st taper conductor, which has a substantially triangular shape when viewed from the direction perpendicular to the center conductor of the 2 antennas,
A second antenna second tapered conductor extending from the second portion of the second antenna and having a substantially triangular shape when viewed from a direction perpendicular to the center conductor of the second antenna.
With
The distance between the extended tip of the second antenna first tapered conductor and the extended tip of the second antenna second tapered conductor is determined by the distance between the extended tip of the second antenna first tapered conductor. Longer than the distance between the end near the antenna slit and the end of the second antenna second taper conductor near the second antenna slit,
The distance between the first side surface of the second antenna and the second side surface of the second antenna at the extended tip of the first taper conductor of the second antenna is the second at the end close to the slit of the second antenna. Longer than the distance between the first side surface of the antenna and the second side surface of the second antenna,
The second antenna first tapered conductor has a third side surface of the second antenna that intersects the direction from the second portion of the second antenna toward the first portion of the second antenna.
The distance between the second antenna coupling point that couples with the first portion of the second antenna on the third side surface of the second antenna and the side that faces the second antenna coupling point is the same as the second antenna coupling point. , Shorter than the distance between the first tip of the second antenna near the first side surface of the second antenna of the first tapered conductor of the second antenna.
The distance between the second antenna coupling point and the side facing the second antenna coupling point is the distance between the second antenna coupling point and the second antenna second side surface of the second antenna first tapered conductor. Shorter than the distance between the second tip of the second antenna, which is close to
Power is supplied to the first part of the second antenna and the second part of the front second antenna.
The first antenna so that the direction from the second part of the first antenna toward the first part of the first antenna and the direction from the second part of the second antenna toward the first part of the second antenna are orthogonal to each other. The center conductor and the center conductor of the second antenna intersect.
Wide structure orthogonal taper slot antenna.

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