JP2003046331A - Polarization diversity antenna device and method of manufacturing diversity antenna - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To enable diversity reception and diversity transmission in an installation space for one antenna, to be small, lightweight, and not to be restricted by the installation place. An input / output plug (12) is provided on one surface of a mounting substrate (11).
a and 12b are provided, and the insulating cylinder 13 is attached to the center of the other surface. Radiation elements 14a and 14b are mounted on the outer peripheral surface near the distal end of the insulating cylinder 13 so that the central axes thereof coincide with the central axis of the insulating cylinder 13 and are orthogonal to each other, and are rotationally symmetric with the radiating elements 14a and 14b. Radiating element 1 at the position
4c and 14d are arranged to form two dipole antennas, which are connected to the input / output connectors 12a and 12b by coaxial cables 15a and 15b. Reflecting elements 16a to 16d are mounted on the insulating cylinder 13 in correspondence with the radiating elements 14a to 14d, and an arm 17 is provided at the tip of the insulating cylinder 13. The arm 17 is connected to the radiating elements 14a to 14d. The wave elements 18a to 18d are arranged in a plurality of stages.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarization diversity antenna device used as an antenna for a communication base station of a mobile body such as a mobile phone and a method for manufacturing a diversity antenna.

[0002]

2. Description of the Related Art Conventionally, an antenna for a mobile communication base station such as a mobile phone normally performs communication by diversity reception using Yagi type antennas of two systems (two branches) or more in order to improve communication quality. There is. Diversity reception using the Yagi antenna (spatial diversity)
When performing the above, it is usually necessary to install two or more antennas at a predetermined interval. However, due to the installation space,
Due to aesthetic issues, it may not be possible to install in an ideal environment.

FIG. 7 shows a conventional installation example in the case of performing diversity reception using a Yagi type antenna. (A) is a plan view and (b) is a side view. In the installation example shown in FIG. 7, two Yagi type antennas 1a and 1b are fixed to a mounting column 3 by a mounting bracket 2. At this time, the two Yagi type antennas 1a and 1b are arranged at a predetermined distance D in the horizontal direction with respect to the ground so that communication by diversity reception is performed.

FIG. 8 shows another example of installation in the case of performing diversity reception. (A) is a plan view, (b) is a plan view.
Is a side view. In the installation example shown in FIG. 8, two Yagi type antennas 1a and 1b are attached to the mounting bracket 2 as in the case of FIG.
It is fixed to the mounting column 3 by a and 2b. At this time 2
The base Yagi type antennas 1a and 1b are arranged at a predetermined distance D in the vertical direction with respect to the ground so that communication by diversity reception is performed.

7 and 8 show the case where the polarizations of the two Yagi antennas 1a and 1b with respect to the ground are vertical, the combination of the polarization of -45 ° and + 45 ° with respect to the ground or It is also possible to perform polarization diversity reception by a combination of horizontal and vertical.

[0006]

However, in the above-mentioned conventional diversity reception method, a plurality of antennas are provided,
There is a problem that diversity reception cannot be performed when the installation space for the number of antennas cannot be secured or when a plurality of antennas cannot be installed due to aesthetic reasons.

Here, the antenna distance D is set to a predetermined distance or more in order to maintain the diversity performance and to suppress the route in which the transmitted wave from one antenna goes around to the receiver via the other antenna. Since it is necessary to suppress the coupling amount between the antennas, the antenna distance D cannot be reduced.

Generally, when the distance between two antennas is reduced, the performance of a single unit is deteriorated and the plane of polarization is significantly disturbed. Especially in the case of polarization diversity system,
There is no reason to spatially separate them other than suppressing this performance deterioration, and it is ideal to combine them into one if possible, and there is a problem.

In addition, since a mobile phone carried by a person does not always have an appropriate antenna angle, it is desirable that a linearly polarized wave having an angle of 45 degrees suitable for a mobile phone can be transmitted and received, especially in a line-of-sight range. ing.

Another problem is that the shorter the distance between the feature that reflects / scatters radio waves and the mobile station, the smaller the antenna distance D in the case of the space diversity system is. Since it becomes difficult to obtain the diversity effect, the antenna distance D must be set very large when communicating with a mobile station located in a narrow space such as in a tunnel, and good communication is realized. It required a large installation space.

Further, a plurality of mounting brackets are required and the size of these mountings becomes large. Therefore, considering the mechanical strength in terms of mass and wind load, the mounting posts must be correspondingly large. Therefore, there is a problem that it is more difficult to secure a space, the appearance is inferior, and the workability is not easy.

The present invention has been made to solve the above problems, and is intended for application to polarization diversity in order to improve the coupling loss in a cross type Yagi antenna. The polarization diversity method that we have focused on utilizes the difference in the polarization planes of the received waves, and the purpose is achieved if there is no correlation between the received polarizations. Therefore, there is no need for spatial correlation between branches as in the spatial diversity scheme. For these reasons, Yagi-type antennas for mobile communication base stations such as mobile phones enable linear polarization diversity reception and diversity transmission in the installation space for one antenna, and they are compact and lightweight, and can be installed in a small space. An object of the present invention is to provide a polarization diversity antenna device which is not easily restricted, is economically and aesthetically excellent, and can be attached to either a vertical column or a horizontal column and has good workability. Another object of the present invention is to provide a method of manufacturing a diversity antenna which is easy to manufacture and can be manufactured at low cost.

[0013]

A polarization diversity antenna device according to the present invention comprises a mounting board, a pair of input / output connectors provided on one surface of the mounting board, and the other surface of the mounting board. A multi-element Yagi antenna of two systems, in which an insulating cylinder attached to the central part of the antenna and antenna elements paired with the insulating cylinder are arranged in a cross shape so as to be orthogonal to each other, and the two-system multi-element Yagi And a coaxial cable for connecting the radiating element of the antenna to the input / output connector.

As described above, the antenna elements that form a pair are orthogonal to each other and are arranged in a cross shape to form a two-system antenna, so that it is possible to perform diversity reception with one antenna in appearance. Further, at the intersection of the central axes of the antenna elements, the area when one antenna element is viewed from the other is only the cross-sectional area of the element, so that the electric field component that couples even when the antenna elements are close to each other Is suppressed, and a good coupling amount characteristic can be obtained between the antennas between the two systems. Therefore, diversity reception and diversity transmission are possible in the installation space for one antenna, linear polarization required for mobile phones can be transmitted and received, and it is small and lightweight, and is not easily restricted by the installation location.
In addition, it can be made economical.

Further, in the method of manufacturing the diversity antenna according to the present invention, four comb-shaped element portions are connected to the side portions of the rectangular element supporting portion with a predetermined width and at a predetermined interval by using one blank plate. And bending the rectangular element supporting portion into a square shape, and bending the four comb-shaped element portions outward at a right angle to form two pairs of antenna elements. Antenna elements are bent into a square shape, and a plurality of square arms are attached to a square arm at a predetermined interval to have a function of a waveguide element. Two square Yagi antennas are provided on one square arm. It is characterized in that it is configured. As described above, the element part and the element support part are integrally formed by bending one punched plate to manufacture an antenna element, thereby eliminating the need for a support base for the element and facilitating incorporation into a square arm. Cost reduction is possible in all aspects, including machining, processing, and assembly.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 shows a configuration example of a polarization diversity antenna device according to a first embodiment of the present invention, where (a) is a front view, (b) is a left side view, and (c). ) Is a rear view. In FIG. 1, reference numeral 11 denotes a mounting board formed of an insulating member in, for example, a circular shape. Input / output connectors 12a and 12b are provided on one surface of the mounting board 11, and an insulating cylinder 13 is provided at the center of the other surface. Is installed. Input / output plug 1
2a and 12b are the mounting substrate 11 as shown in FIG.
It is provided by being displaced laterally from the central part of the. The input / output connectors 12a and 12b are silver-plated or gold-plated on the center conductor of the antenna and the center conductor of the feeder-side connector to prevent intermodulation noise. And the insulating cylinder 1
3, radiators 14a and 14b each having a length of about ¼ wavelength are mounted on the outer peripheral surface near the tip such that the central axes thereof coincide with the central axis of the insulating cylinder 13 and are orthogonal to each other. In this case, the radiating elements 14a and 14b are arranged at positions of ± 45 ° with respect to the ground, for example.

Further, in the insulating cylinder 13, the radiating element 14 is placed at a position rotationally symmetrical to the radiating elements 14a and 14b.
c and 14d are arranged to form a two-system dipole antenna in which radiating elements 14a and 14c and radiating elements 14b and 14d are paired. These two dipole antennas are
The coaxial cables 15a and 15b are connected to the input / output connectors 12a and 12b, respectively. When connecting the dipole antenna and the coaxial cables 15a and 15b, balance and
Insert an unbalanced conversion circuit as appropriate.

Next, in the insulating cylinder 13, the radiating elements 14a ...
14d and the mounting substrate 11 between the radiating element 14a
Reflectors 16a to 16d, which are slightly longer than a quarter wavelength, are mounted at a predetermined distance from .about.

Further, an arm 17 is provided by aligning the central axis with the tip of the insulating cylinder 13, and the arm 17 is ¼ so that the angle about the central axis as a rotation axis is the same as that of the radiating elements 14a to 14d. Waveguide elements 18a to 18 slightly shorter than the wavelength
d is arranged in a plurality of stages, for example, six stages, with a predetermined distance.

In the above embodiment, the angle of each element with the central axis of the insulating cylinder 13 and the arm 17 as the rotation axis is as shown in FIG.
When the upper side of the left side view shown in FIG.
And 135 °, 225 ° and 315 °.

With the above structure, the reflecting element 1
6a, 16c, or the reflecting elements 16b, 16d, respectively, function as a reflector of the Yagi antenna, and the waveguide elements 18a, 18c or the waveguide elements 18b,
Each of the 18d acts as a director for the Yagi antenna, and thus has a directional sensitivity in the director direction.
The Yagi antenna of the system can be externally used as one antenna. By providing two systems of Yagi type antennas as described above, it is possible to transmit and receive diversity by using one antenna in appearance.

When a person carries a mobile phone,
Although not necessarily an appropriate antenna angle, installing each element at a position of ± 45 ° with respect to the ground enhances the diversity effect and also increases the probability that the polarization planes will match within the line-of-sight distance. You can

Further, at the intersection of the central axes of the dipoles of the two systems consisting of the radiating elements 14a and 14c and the radiating elements 14b and 14d, the area when one dipole is viewed from the other is only the cross-sectional area of the element. , The electric field component to be coupled is suppressed even when the dipoles are close to each other, and even when the Yagi type antenna is configured, the coupling amount between the two systems is suppressed and the system operates well. As a result, it becomes possible to transmit and receive the linearly polarized wave required for the mobile phone.

FIG. 2 shows a coupling amount characteristic between the two systems of Yagi type antennas according to the first embodiment. In the frequency band of the center frequency fo ± 5%, a good coupling amount of −27 dB or less is obtained. The characteristics are obtained.

Since the good coupling amount characteristic is obtained as described above, it becomes possible to put a transmission wave on one branch of the reception diversity antenna and it can be used as a transmission diversity antenna. Therefore, it is possible to perform transmission diversity even when the specifications, performance, or restrictions of the transmitter are severe, and as a result, for example, W
-Compatible with CDMA transmission diversity and fully compatible with next-generation equipment.

In the first embodiment, the insulating cylinder 13 is used.
The angles of the respective elements having the central axis of the arm 17 as the rotation axis are set to 45 °, 135 °, 225 °, and 315 ° when the upper side of the left side view shown in FIG. 1B is 0 °. Although the case has been shown, other factors such as 0 °, 90 °
It may be set to 180 ° and 270 °, that is, each element may be set horizontally and vertically. Further, the angle of each element with the central axis of the insulating cylinder 13 and the arm 17 as the rotation axis may be any other angle as long as the angle between adjacent elements is 90 °.

In addition, in the first embodiment, the insulating cylinder 13 is used.
Although the case where the arm for mounting the antenna element is configured by the arm 17 and the arm 17 has been described, it goes without saying that all the antenna elements may be mounted on one insulating cylinder or arm.

(Second Embodiment) Next, a second embodiment of the present invention will be described. 3A is a plan view of the polarization diversity antenna device according to the second embodiment of the present invention, and FIG. 3B is a front view thereof. The second embodiment shows an example of a configuration in which the polarization diversity antenna shown in the first embodiment is mounted on a support by a mounting bracket.

First, the length of the input / output connector 12a, 12b from the mounting surface to the mounting substrate 11 and the input / output connector 12a, 1b.
The interval between the two 2b is set to approximately 2.5 times or more the outer diameter of the input / output connector 12a, 12b. Then, the antenna mounting bracket 31 is mounted on the one surface of the mounting substrate 11, that is, the central portion of the surface on which the input / output connection plugs 12a and 12b are provided, through the angle variable bracket 20. Attach to 32. In this case, the antenna mounting bracket 3
1 is, as shown in FIG.
The input and output connectors 12a and 12b are arranged on the opposite side to be offset so as to improve workability.

In the angle variable fitting 20, the two fixed substrates 21a and 21b are arranged at a predetermined interval, and
Movable substrates 22a and 22b are provided on the inner side of the movable substrates 22a and 22b.
It is rotatably attached to a and 21b. In addition, the fixed substrate 2
1a and 21b are provided with arcuate elongated holes 24 on the tip side, and the movable substrates 22a and 22b are attached to the bolts 2 at the elongated holes 24.
5 and nut 26. That is, bolt 2
5 and the nut 26 are loosened, the movable substrates 22a and 22b can be moved within the elongated hole 24. By tightening the bolt 25 and the nut 26, the movable substrates 22a and 22b can be moved.
22b is fixed to the fixed substrates 21a and 21b.

The fixed substrates 21a and 21b are provided with screws 27.
The movable substrates 22a and 22b are attached to the mounting substrate 11 by screws 28, and the movable substrates 22a and 22b have their tips protruding from the fixed substrates 21a and 21b.

In the angle variable metal fitting 20, the movable substrates 22a and 22b can be rotated within the range of the elongated holes 24 by loosening the bolts 25 and the nuts 26, so that the antenna can be vertically moved as shown in FIG. 3 (b). It is possible to move and adjust the direction considering the desired service area. After adjusting the direction of the antenna, the bolt 25 and the nut 26 are tightened and fixed.

By providing the angle variable metal fitting 20 between the mounting board 11 and the antenna mounting metal fitting 31 as described above, the direction of the antenna can be arbitrarily adjusted. Further, the length of the input / output connector 12a, 12b from the mounting surface of the mounting substrate 11 and the distance between the input / output connector 12a, 12b are about 2.5 times or more the outer diameter of the input / output connector 12a, 12b. And the antenna mounting bracket 31 is arranged offset to the side opposite to the input / output connection plugs 12a and 12b with respect to the center axis of the antenna, thereby improving workability such as connection of external cables and waterproof taping work. be able to.

Furthermore, the antenna element according to the present embodiment is
Since the antenna is 90 ° rotationally symmetric with respect to the central axis of the antenna, the entire antenna including the antenna mounting bracket 31 is rotated by 90 ° or −90 ° with respect to the central axis of the antenna to set the installation angle of the antenna element with respect to the ground. It can be mounted, without modification, on either a vertical column 32 or a horizontal column relative to the ground.

(Third Embodiment) Next, a third embodiment of the present invention will be described. FIG. 4A is a plan view of the polarization diversity antenna device according to the third embodiment of the present invention, and FIG. 4B is a front view thereof. The third embodiment is the same as the second embodiment except that the entire antenna element portion is covered with, for example, a cylindrical insulating cover 35. Both ends of the insulating cover 35 are preliminarily provided with water drain holes 36 at the lowermost portion and one side portion, but are plugged (not shown) at the time of manufacturing. This plug can be freely attached and detached. Then, when the completed polarization diversity antenna device is actually mounted on a vertical or horizontal column, of the drainage holes 36 in the above-mentioned connected state, the plugs for the two drainage holes 36 located on the lower side are plugged. To remove water to give it the effect of draining water.

When the antenna element portion is covered with the insulating cover 35 as described above, the lengths of the input / output connection plugs 12a and 12b from the mounting surface to the mounting substrate 11 and the input / output connection are as described in the second embodiment. By setting the distance between the plugs 12a and 12b to be approximately 2.5 times or more the outer diameter of the input / output contact plugs 12a and 12b, the work of attaching the insulating cover 35 can be easily performed.

Further, by providing the water drain holes 36 in the lowermost portion and one side portion of the insulating cover 35 in advance, even if the antenna device is rotated by 90 ° in accordance with the installation conditions of the antenna, etc. The function of draining water can be provided only by removing the plug of the drainage hole 36 located on the side.

By covering the entire antenna element portion with the insulating cover 35 as described above, the antenna strength against flying objects from the outside can be improved, the weather resistance can be improved, and the deterioration of performance due to snowfall, rainfall, etc. can be suppressed. Moreover, it can be excellent in terms of aesthetics.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described. 5A and 5B show a method for manufacturing a diversity antenna according to a fourth embodiment of the present invention. FIG. 5A is a front view showing a developed view of the antenna element structure, and FIG. 5B is a bottom view. 6A and 6B show an example of a shape of the antenna element constructed in FIG. 5 after bending and a usage state, wherein FIG. 6A is a plan view, FIG. 6B is a front view, and FIG. Is a left side view. In the fourth embodiment, a case is shown in which the antenna elements such as the waveguide elements 18a to 18d shown in each of the above embodiments are formed by processing one plate.

That is, as shown in FIG. 5 and FIG.
The pair of element portions 41a to 41d and the element support portion 42 are configured to be manufactured as an integrated antenna element 40 by bending one punched plate and attached to the square arm 50.

The element supporting portion 42 comprises four members 42a to 42d as shown in FIG.
Bending is performed at 3. Then, the members 42a, 42
Two pairs of element portions 41a to 41d are connected to one side portion of c in a comb shape at a predetermined interval, and are bent outward at a broken line portion 44. A concave portion 45 is formed at the base of the member 42a, and a convex portion 46 is formed at the tip of the member 42d so that the concave portion 45 and the convex portion 46 engage with each other when bending is performed. Further, the members 42a and 42c are provided with holes 47 for inserting bolts.

In the above structure, the element support portion 42 is formed into a rectangular shape by bending the members 42a to 42d at the broken line portions 43 to the inside by 90 °, and the element portion 4
1a to 41d are bent outward by 90 ° at the broken line portion 44 and positioned in a cross shape on the same plane to complete the antenna element 40.

Next, as shown in FIG. 6, the square arm 50 is inserted into the element support portion 42 of the completed antenna element 40, and the hole 47 of the element support portion 42 is provided at a predetermined position of the square arm 50. The holes are aligned with the holes (not shown) and fixed by bolts 51 and nuts 52. As a result, the two pairs of element portions 41a to 41d are arranged in a cross shape orthogonal to the square arm 50. The antenna element 4
A plurality of 0s are attached to the square arm 50 at a predetermined interval to form a waveguide element, thereby completing the polarization diversity antenna device as shown in each of the above embodiments. Here, only the configuration for the waveguide element has been described, but it may be configured for the reflection element depending on the application.

As described above, the element parts 41a to 41d and the element support part 42 are integrally formed by bending one punched plate to manufacture the antenna element 40, and a square-shaped support structure is formed for the square arm 50. By adopting the antenna element structure that also has a dual function, a support base for the element becomes unnecessary and the square arm 5 is provided.
It is easy to incorporate into 0, cost can be reduced in all aspects such as material, processing and incorporation, and moreover, good yield can be obtained and coupling loss can be improved.

[0045]

As described in detail above, according to the present invention, 4
By arranging two antenna elements in a cross shape to form two systems of antennas, it is possible to perform diversity reception with one antenna in appearance. Further, at the intersection of the central axes of the antenna elements, the area when one antenna element is viewed from the other is only the cross-sectional area of the element, so that the electric field components that are coupled even when the antenna elements are close to each other Is suppressed, and a good coupling amount characteristic can be obtained between the antennas between the two systems. Therefore, it becomes possible to put a transmission wave on one branch of the reception diversity antenna, and it can be used as a transmission diversity antenna. That is, diversity reception and diversity transmission can be performed in the installation space for one antenna, linear polarization required for mobile phones can be transmitted and received, and it is small and lightweight, is not easily restricted by the installation location, and is economical. There is a great effect that

Further, since each antenna element is formed so as to be rotationally symmetrical with respect to the central axis of the antenna by 90 °, the entire antenna including the antenna mounting bracket is rotated by 90 ° or -90 ° with respect to the central axis of the antenna. As a result, the antenna element can be attached to either a vertical column or a horizontal column without changing the installation angle of the antenna element with respect to the ground.

Further, in the method of manufacturing the diversity antenna according to the present invention, the antenna element and the element supporting portion are integrally formed by bending one punched plate, and the antenna element is formed into a square shape with respect to the square arm. By adopting an antenna element structure that also has a support structure, a support base for the element is not required and it can be easily incorporated into the square arm, and cost reduction can be achieved in all aspects such as material, processing, and incorporation. In addition, the yield can be improved and the coupling loss can be improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a polarization diversity antenna device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a coupling amount characteristic between antennas in the same embodiment.

FIG. 3 is a configuration diagram of a polarization diversity antenna device according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram of a polarization diversity antenna device according to a third embodiment of the present invention.

FIG. 5 is a diagram showing a development view of an antenna element structure according to a fourth embodiment of the present invention.

FIG. 6 is a diagram showing an example of a shape of the antenna element after bending and a usage state in the same embodiment.

FIG. 7 is a diagram showing an installation example when diversity reception is performed using a conventional Yagi antenna.

FIG. 8 is a diagram showing another installation example in the case of performing diversity reception using a conventional Yagi type antenna.

[Explanation of symbols]

11 ... Mounting board 12a, 12b ... Input / output connector 13 ... Insulation cylinder 14a to 14d ... Radiating element 15a, 15b ... Coaxial cable 16a to 16d ... Reflective element 17 ... Arm 18a to 18d ... Waveguide element 20 ... Angle variable bracket 21a, 21b ... Fixed substrate 22a, 22b ... Movable substrate 23 ... Axis 24 ... Slot 25 ... bolt 26 ... Nut 27, 28 ... screw 31 ... Antenna mounting bracket 32 ... Prop 35 ... Insulation cover 36 ... Drainage hole 40 ... Antenna element 41a-41d ... Element part 42 ... Element support 42a-42d ... Member 43, 44 ... Broken line part 45 ... Recess 46 ... Projection 47 ... hole 50 ... Square arm 51 ... bolt 52 ... Nut

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI Theme Coat (Reference) H01Q 19/30 H01Q 19/30 H04B 7/10 H04B 7/10 B (72) Inventor Koichi Takita Nakano, Tokyo 3-14-20 Higashi-Nakano-ku, Hitachi Kokusai Electric Co., Ltd. (72) Inventor Rikuo Fujita 3--14-20 Higashi-Nakano, Nakano-ku, Tokyo Inventor Hitachi Kokusai Electric (72) Shinichi Aoyama Shinano Shinjuku, Tokyo 34th Town JR Shinanomachi Building F-Term in JF East Japan Co., Ltd. (reference) 5J020 AA03 BA02 BC03 BC09 BD03 CA01 CA04 DA03 DA04 5J021 AA02 AA10 AB03 BA01 GA08 HA05 HA06 HA10 JA05 JA07 5J046 AA04 AA07 AB07 AB10 CA08 RA04 5J047 A07 A07A07A. AB07 AB10 BG10 5K059 CC05

Claims (11)

[Claims] 1. The center axes of two multi-element Yagi type antennas are aligned with the center axes of one insulating cylinder, and the center axis of each antenna element forming a pair of the two antennas is the center of each antenna element. Characterized in that two antennas are arranged on one insulating cylinder by arranging the antenna elements orthogonally so that the point where the antenna elements intersect with each other becomes the central axis of the insulating cylinder. Polarization diversity antenna device. 2. A mounting board, a pair of input / output connectors provided on one surface of the mounting board, an insulating cylinder mounted on the other surface of the mounting board at the center, and an insulating cylinder. A two-system multi-element Yagi-type antenna configured by arranging a pair of antenna elements orthogonal to each other in a cross shape, and a coaxial connecting the radiating element of the two-system multi-element Yagi-type antenna to the input / output connector A polarization diversity antenna device comprising a cable. 3. A mounting board, a pair of input / output connectors provided on one surface of the mounting board by being displaced laterally from a central portion, and mounted on the central portion of the other surface of the mounting board. A multi-element Yagi-type antenna of two systems, in which an insulating cylinder and a pair of antenna elements that are paired with the insulating cylinder are arranged orthogonally to each other in a cross shape, and a radiating element of the two-system multi-element Yagi antenna. A polarization diversity antenna device comprising: a coaxial cable connected to the input / output connector; and an antenna mounting bracket mounted on the center of one surface of the mounting substrate. 4. A mounting board, a pair of input / output connectors provided on one surface of the mounting board to be displaced laterally from a central portion, and mounted on the other surface of the mounting board at the central portion. A multi-element Yagi-type antenna of two systems, in which an insulating cylinder and a pair of antenna elements that are paired with the insulating cylinder are arranged orthogonally to each other in a cross shape, and a radiating element of the two-system multi-element Yagi antenna. A coaxial cable to be connected to the input / output connector, an angle variable metal fitting attached to the center of one surface of the mounting board, and an angle variable metal fixture offset to the opposite side of the input / output connector. A polarization diversity antenna device comprising an antenna mounting bracket. 5. The antenna element is arranged at an angle of about 45 ° with respect to the ground.
The polarization diversity antenna device according to 2, 3, or 4. 6. The polarization diversity antenna device according to claim 1, wherein the antenna element is formed so as to be rotationally symmetric with respect to the central axis of the antenna by 90 °. 7. A mounting board, an insulating cylinder to be mounted on the mounting board, and an outer peripheral surface near the tip of the insulating cylinder.
The central axis coincides with the central axis of the insulating cylinder and is orthogonal to each other,
A first radiating element having a length of about ¼ wavelength arranged at an angle of about 45 ° with respect to the ground; and the first radiating element of the insulating cylinder.
A second radiating element arranged in a position rotationally symmetrical to the radiating element of the above, and provided at the same angle as the radiating element with respect to the insulating cylinder, between the first and second radiating elements and the mounting substrate. A reflecting element having a wavelength longer than a quarter wavelength, and 1 provided on the arm at the tip of the insulating cylinder at the same angle as the radiating element.
/ 4 wavelength diversity antenna, and a pair of input / output connectors provided on the mounting substrate and connected to the radiating element via coaxial cables, respectively. apparatus. 8. The pair of input / output connectors have a length from a mounting surface to a mounting board and a distance between the input / output connectors are approximately 2.5 times or more the outer diameter of the input / output connectors. 8. The polarization diversity antenna device according to claim 2, wherein the polarization diversity antenna device is set. 9. The polarization diversity antenna device according to claim 2, wherein the entire antenna element part is covered with an insulating cover. 10. The polarization diversity antenna device according to claim 9, wherein the insulating cover is provided with a drainage hole that is detachably plugged in advance in a lower portion and one side portion. 11. A rectangular element support portion is provided with four comb-shaped element portions connected to each other on a side portion of a rectangular element support portion with a predetermined width and a predetermined interval by one punching plate. Is bent into a square shape, and the four comb-shaped element portions are bent outward at right angles to form two pairs of antenna elements, and the antenna elements are bent into a square shape. A diversity antenna, characterized in that a plurality of Yagi-type antennas are mounted on one square arm by mounting a plurality of square arms at predetermined intervals on the square arm so as to function as a waveguide element. Method.