JPS6238602A - Corrugated antenna with elliptic aperture - Google Patents

Abstract

PURPOSE:To convert the mode of a waveguide into an elliptic corrugated balanced hybrid mode without the change of resonance characteristic and mismatching by providing several-stages of corrugations whose slot depth width and tooth thickness are changed so that the electric field component of an electromagnetic wave in the progressing direction is nearly zero at the tip of the tooth of corrugation. CONSTITUTION:In order to attain smooth conversion from the elliptic waveguide mode (TE mode) into the elliptic corrugated balanced hybrid mode, the depth 3 of the corrugated slot is decided so that the condition of E2=0 is established at the tip 1 of the tooth of the corrugation matching part 7. A conversion corrugation matching part 8 is provided with several stages of conversion parts ranging from the slot depth equal to that of the corrugation matching part 7 to the depth of corrugation slot of an elliptic corrugated waveguide so as to make the depth of slot smoothly coincident with the depth 5 of the corrugation slot. Through the constitution above, in converting the TE11 mode of the waveguide into the HE11, nearly complete matching is taken to eliminate the resonance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an elliptical corrugated antenna that can be used as a primary radiator of an elliptical reflector antenna.

In particular, the present invention relates to a matching device that can convert the waveguide mode of an elliptical waveguide having a smooth tube wall into an elliptical corrugated balanced hybrid mode without causing any resonance phenomenon.

C4!1 Essential] The present invention provides an elliptical corrugated waveguide or an elliptical corrugated horn, in which an electric field is generated between the elliptical corrugated waveguide or elliptical corrugated horn and the elliptical waveguide in the direction of propagation of electromagnetic waves at the tips of the teeth of the corrugation. By providing an elliptical corrugated section with several stages of corrugation with groove depth and width and tooth thickness designed under conditions where the component is close to zero, the waveguide mode of the elliptical waveguide can be changed to an elliptical corrugated waveguide. It is designed to convert to a balanced hybrid mode without resonance characteristics or mismatch.

[Conventional technology]

Conventionally, matching has been performed to convert an elliptical corrugated m-wave tube or an elliptical corrugated horn and an elliptical waveguide section having a smooth tube wall from the TE mode or TM mode of the waveguide mode to the elliptical corrugated balanced hybrid mode without mismatching. There was no clear design method for the equipment. For this reason,
The applicant previously filed a patent application No. 5 in Japanese Patent Application No. 59-281631.
As shown in Fig. 6, an elliptical corrugated section under the condition that the electric field component in the direction of electromagnetic wave propagation becomes almost zero at the tip 1 of the tooth of the corrugation in the vicinity where the depth of the corrugation groove connects with the elliptical waveguide. Combine 7 and gradually make an oval corrugated +-
A design method was proposed in which the depth of the corrugated groove of an i-wave tube 9 or an elliptical corrugated horn is converted through the corrugation section 8.

The applicant's design method is based on the T E + + of an elliptical waveguide.
In order to convert from the mode to the HE + + balanced nobu lift mode of an elliptical corrugated waveguide or an elliptical corrugated horn, the design focuses on the depth of the full gate groove, and the width of the corrugation groove and the teeth of the corrugation. There is no clear condition for the thickness of the corrugation groove, and the width of the corrugation groove is usually about 0.05λ to 0.3λ when normalized by the free space wavelength (λ). The width was set to 0.1 to 1 times the width, and all the corrugated parts in the alignment device were designed to be the same.

[Problem that the invention seeks to solve]

However, even in a well-matched device, resonance characteristics occur within the used frequency band, and at the frequency where the resonance occurs, when circularly polarized waves are excited, the elliptical polarization rate deteriorates extremely to about 3 to 6 dB. For this reason, even when an elliptical corrugated horn designed using the method related to the applicant's earlier application is used as the primary radiator of a reflector antenna mounted on a broadcasting satellite, resonance characteristics often occur in the broadcasting frequency band, and WAI? C-B5'79
There was a problem in that it was difficult to satisfy the cross-polarization standards of the World Radiocommunication Administration Conference (December 1979, G1) for Z-band broadcasting satellites.

The present invention solves the above problems, and provides an elliptical aperture corrugated antenna that can convert the waveguide mode of an elliptical waveguide with a smooth tube wall into an elliptical corrugated balanced hybrid mode without resonance characteristics or mismatch. The purpose is to provide.

[Means for solving problems]

The present invention provides an elliptical opening surface in which one opening surface is coupled to an elliptical waveguide with a smooth tube wall, the other opening surface is coupled to an antenna, and the tube wall is provided with multiple stages of thin teeth in the elliptical circumferential direction. In the corrugated antenna, several stages of thin teeth in the circumferential direction of the ellipse are provided on the tube wall between the one opening surface and the elliptical waveguide, and the width of the groove of the thin tooth and the thickness of the tooth are equal to the width of the groove of the thin tooth. It is characterized by a structure in which corrugated parts with an elliptical frontage are connected to each other under the condition that the electric field component in the direction of electromagnetic wave propagation is almost zero at the tip.

In the present invention, the elliptical aperture corrugated antenna can be an elliptical corrugated waveguide or an elliptical corrugated horn.

[For production]

The present invention provides a groove designed between an elliptical corrugated waveguide or an elliptical corrugated horn and an elliptical waveguide by applying the condition that the electric field component in the traveling direction of the t-magnetic wave is almost zero at the tips of the corrugation teeth. By creating a structure that combines elliptical corrugated parts with several stages of corrugated thins with different widths and tooth thicknesses, the waveguide mode of the elliptical waveguide with a smooth tube wall can be transformed into an elliptical corrugated balanced hybrid mode with resonance characteristics and vibration characteristics. Can be converted without matching.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

FIG. 7 is a diagram showing an elliptical cylindrical coordinate system used to determine the depth of the corrugation groove of the matching section of the present invention, and shows a cross section of an elliptic corrugated A-wave tube.

Elliptical cylindrical coordinate system (ξ, η, 2) and rectangular coordinate system (x.

y, z), the following relationship holds true.

h is a constant and is 172, which is the distance between the confocal points of the ellipse.

The major axis radius a (, a 6 and the minor axis radius S, , bo of the elliptical corrugate are expressed as follows using equation (1).

Further, if the eccentricity of each ellipse is "I" and eo, the following relationship holds true.

Next, FIG. 1 is a longitudinal sectional view of a matching portion of an elliptical corrugated waveguide according to an embodiment of the present invention. In Fig. 1, 1 is the tip of the corrugation in the matching part, 2 is the deepest part of the corrugation in the matching part, 3 is the depth of the corrugation groove in the matching part, 4 is the depth of the corrugation groove in the conversion corrugation matching part, and 5 is the depth of the corrugation groove in the matching part. The depth of the corrugated groove of the elliptical corrugated I-wave tube, 6 is the elliptical waveguide, 7 is the corrugation matching part near the joint with the elliptical waveguide, and 8 is the conversion corrugation up to the joint with the elliptical corrugate waveguide. The matching part, 9 is an elliptical corrugated waveguide that satisfies the balanced hybrid condition, b is the width of the groove in the matching part, t is the thickness of the corrugation tooth, 2 is the propagation direction, and E2 is the tip 1 of the corrugation tooth. Electric field in Z direction, T E + I is elliptical waveguide mode, HE1
) indicates the elliptic corrugated waveguide mode. FIG. 2 is a cross-sectional view of the matching portion of the elliptical corrugated waveguide of the present invention.

In FIG. 2, the variable value ξ. The part between the ellipses and ξ indicates the depth of the groove of the matching corrugation.

Here, in order to smoothly convert from the elliptical waveguide mode (TE mode) to the elliptical corrugated waveguide mode, it is necessary to
The depth 3 of the corrugated groove is determined so that the condition 2=0 holds true. Under the conditions of Ez -〇, (1), (2), (
The depth 3 of the corrugated groove can be found by expanding Ma-Tuxwell's electromagnetic equation using equation 3) and finding the characteristic equation at the boundary of the tip 1 of the tooth using the Matthiou function.

Next, after determining the depth 3 of the corrugated groove under the above conditions,
Determine the width of the corrugated groove and the thickness t of the corrugated teeth. The width of this groove is set to 0.05λ or less (0.04λ in this example) in the range of the corrugation matching part 7 near the coupling part with the elliptical waveguide, and the tooth thickness t is In the area of the matching portion 7, the width is 0.1 to 1 times the width of the groove. Next, the conversion corrugation matching section 8
Then, several stages of conversion parts are provided from the depth of the groove in the corrugation matching part 7 to the depth of the corrugation groove of the elliptical corrugated waveguide, so that the depth of the corrugation groove is smoothly matched with the depth 5 of the corrugation groove. In this case, the width of the corrugation groove and the tooth thickness t of the conversion corrugation matching part 8 are the same as in the conventional corrugation, b = 0.05λ to 0.3
Let λ, t =O0lb~1b.

With the above configuration, from the TE1) mode of the waveguide to the HE,
, mode, it has conventionally been difficult to obtain good matching characteristics due to resonance phenomena caused by higher-order modes, but according to the present invention, almost perfect matching can be achieved and resonance phenomena can be eliminated.

Figures 8 and 9 show the results of measuring the reflection transmission characteristics of the conventional elliptical corrugated horn antenna and the elliptical corrugated horn antenna using the matching section of the present invention in the elliptic short axis excitation mode and the elliptic long axis excitation mode. show. While the conventional elliptical corrugated horn antenna causes a resonance phenomenon as shown by the circle in the figure, the elliptical corrugated horn antenna using the matching section of the present invention eliminates the resonance phenomenon and provides good frequency characteristics. It is being

FIG. 3 is a longitudinal sectional view of an elliptical corrugated horn according to another embodiment of the present invention. In the drawing, 6 elliptical waveguides, 7
8 is a corrugation matching portion coupled to the elliptical waveguide, 8 is a conversion corrugation portion, and 1o is a portion opened in a horn shape to serve as an antenna. The depth of the corrugated grooves, the width of the grooves, and the thickness of the teeth in the matching section of this embodiment are determined in the same manner as in the case of the elliptical corrugated waveguide shown in FIG.

〔Effect of the invention〕

As described above, the present invention has the excellent effect of converting the waveguide mode of an elliptical R-wave tube with a smooth tube wall into an elliptical balanced hybrid mode without mismatch and eliminating resonance phenomena. Therefore, when the elliptical corrugated horn of the present invention is used as the primary radiator of an elliptical reflector antenna, an antenna with excellent efficiency, cross-polarization characteristics, and sidelobe characteristics can be realized.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a matching part of an elliptical corrugated waveguide according to an embodiment of the present invention. Figure 2 is its cross-sectional view. FIG. 3 is a longitudinal cross-sectional view of the matching part of the elliptical Corday 1-horn according to one embodiment of the present invention. Figure 4 is its cross-sectional view. FIG. 5 is a longitudinal sectional view of a matching section of a conventional elliptical corrugated waveguide. Figure 6 is its cross-sectional view. FIG. 7 is a diagram showing an elliptical column coordinate system used to determine the depth of the corrugated groove of the matching part of the present invention. Figure 8 is a reflection transmission characteristic diagram of a conventional elliptical corrugated horn antenna. FIG. 9 is a diagram showing irregular transmission characteristics of an elliptical corrugated horn antenna using the matching section of the present invention. ■... tip of corrugation tooth, 2... deepest part of corrugation groove, 3... depth of corrugation groove, 4... depth of corrugation groove of conversion corrugation matching part, 5... ... Depth of corrugation groove of elliptical corrugated waveguide, 6... Elliptical waveguide, 7... Corrugation In, 8... Conversion corrugation part, 9
...Oval corrugated i-wave tube, 10...Oval aperture corrugated horn. Vertical cross-sectional view of the matching part of the waveguide Cross-sectional view of Figure 6 Cross-sectional view of Figure 6/v) Vertical cross-sectional view of the matching part of the horn, ¥) 5 Conventional 91) 4-wave tube matching part Vertical cross-sectional view of Figure 5 Transverse cross-sectional view Explanatory diagram using an elliptical cylindrical coordinate system Reflection transmission characteristics using the matching part of a conventional trusted corrugated horn antenna Frequency (GHz) Uninvented matching part Gold circle reflection Transmission Characteristics Procedural Amendment 1) Month 12, 1985 1, Case Description 1985 Patent Application No. 178995 2, Title of Invention Elliptical Aperture Corrugated Antenna 3
, Relationship to the case of the person making the amendment Patent applicant address 5-33-1 Shiba, Minato-ku, Tokyo Name (
423) NEC Corporation Representative Tadahiro Sekimoto 4, Agent 5, Date of amendment order (voluntary amendment) 8. Contents of amendment (1) The description will be amended as per the amended description. (2) Replace Figure 3 with the attached drawing. 9. List of attached documents (1) 1 amended specification (2) 1 drawing 1 amended specification 1, title of invention elliptical aperture corrugated antenna 2, claims <1) one aperture surface is smooth In an elliptical aperture corrugated antenna that is coupled to an elliptical waveguide on a tube wall, the other aperture surface is coupled to an antenna, and the tube wall is provided with multiple stages of thin teeth in the circumferential direction of the ellipse, one of the aperture surfaces and the above Between the elliptical waveguide and the tube wall, several stages of thin teeth are provided in the direction of the circumferential direction of the ellipse. An elliptical aperture corrugated antenna characterized by a structure in which elliptical aperture corrugated parts are combined under conditions of approximately zero. (2) The elliptical aperture corrugated antenna according to claim 1, wherein the elliptical aperture corrugated antenna is an elliptical corrugated waveguide. (3) The elliptical aperture corrugated antenna according to claim 1, wherein the elliptical aperture corrugated antenna is an elliptical corrugated horn. (4) When the free space wavelength is λ, the width of the groove on the waveguide side of the smooth tube wall is 0.05λ or less, the thickness of the tooth is 0.1 to 1 times the width of the groove, and the aperture surface is Groove 161 on the antenna side
0.05λ to 0.3λ, the tooth thickness is 0.1 of the groove width.
An elliptical aperture corrugated antenna according to claims (1) to (3), which has an elliptical corrugated portion that is multiplied by 1 to 1 times. 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an elliptical corrugated antenna applied as a primary radiator of an elliptical reflector antenna. In particular, the present invention relates to a matching device capable of converting the waveguide mode of an elliptical waveguide having a smooth tube wall into an elliptical corrugated balanced tone hybrid mode without causing a resonance phenomenon. [Summary] The present invention provides an elliptical corrugated waveguide or an elliptical corrugated horn.
Circle 1: Several stages of corrugations with different groove depths, groove widths, and tooth thicknesses are designed by applying the condition that the electric field component in the direction of electromagnetic wave propagation approaches zero at the tips of the corrugation teeth between the wave tube and the wave tube. By providing the elliptical corrugated portion, the waveguide mode of the elliptical waveguide is converted into the elliptical corrugated balanced hybrid mode without resonance characteristics or mismatch. [Prior Art] Conventionally, an elliptical corrugated waveguide or an elliptical corrugated horn and an elliptical waveguide portion having a smooth tube wall are converted from the TE mode or TM mode of the waveguide mode to an elliptical corrugated balanced hybrid without mismatching. There was no clear design method for the matching device that converts into modes. For this reason,
The applicant previously filed a patent application No. 5 in Japanese Patent Application No. 59-281631.
As shown in Fig. 6, an elliptical corrugated section under the condition that the electric field component in the direction of electromagnetic wave propagation becomes almost zero at the tip 1 of the tooth of the corrugation in the vicinity where the depth of the corrugation groove connects with the elliptical waveguide. A design method was proposed in which the depth of the corrugated groove of the elliptical corrugated waveguide 9 or the elliptical corrugated horn is gradually converted through the corrugated portion 8. The applicant's design method is based on the T E + + of an elliptical waveguide.
In order to convert the mode from the HE I+ balanced hybrid mode of an elliptical corrugated waveguide or an elliptical corrugated horn, the design focuses on the depth of the corrugation groove, and the width of the corrugation groove and the thickness of the corrugation teeth. There are no clear conditions for this, and the width of the corrugation groove is usually expressed as normalized by the free space wavelength (λ).
The thickness of the corrugation teeth was about 0.05λ to 0.3λ, and the thickness of the corrugation teeth was 0.1 to 1 times the width of the groove, and all the corrugation parts in the alignment device were designed to be the same. [Problems to be solved by the invention] However, even when well matched, resonance characteristics occur within the used frequency band, and at the frequency where the resonance occurs, the elliptic polarization becomes extremely worse when circularly polarized waves are excited. It also reached about 3 to 6 dB. For this reason, even when an elliptical corrugated horn designed using the method related to the applicant's earlier application is used as the primary radiator of a reflector antenna mounted on a broadcasting satellite, resonance characteristics often occur in the broadcasting frequency band, and WARC- BS'79
There was a problem in that it was difficult to satisfy the cross-polarization standards of the 1979 World Radiocommunication Administration Conference on Broadcasting Satellites in the 12 GHz Band. The present invention solves the above problems, and provides an elliptical aperture corrugated antenna that can convert the waveguide mode of an elliptical waveguide with a smooth tube wall into an elliptical corrugated balanced hybrid mode without resonance characteristics or mismatch. The purpose is to provide. [Means for Solving the Problems] The present invention is characterized in that one opening surface is coupled to an elliptical waveguide with a smooth tube wall, the other opening surface is coupled to an antenna, and the tube wall has a thin In an elliptical aperture corrugated antenna having multiple stages of teeth, several stages of thin teeth in the circumferential direction of the ellipse are provided on the tube wall between the one aperture surface and the elliptical waveguide, and the tips of the thin teeth It is characterized by a structure in which elliptical corrugated parts are connected under the conditions that the electric field component in the direction of electromagnetic wave propagation is almost zero. This elliptical corrugated part is coupled to the elliptical waveguide on the smooth tube wall side in several steps, and the depth of the groove is gradually made shallower.
, a several-stage elliptical corrugated section that fails to meet the mode conditions, and the width of the corrugation groove is set to 0.
05λ or less, b is 0.05 in the subsequent elliptical corrugated part
Preferably, the tooth thickness t is 0.1 to 1 times b over the entire elliptical corrugated portion. In the present invention, the elliptical aperture corrugated antenna can be an elliptical corrugated waveguide or an elliptical corrugated bone. [Function] The present invention is designed by applying a condition between an elliptical corrugated waveguide or an elliptical corrugated horn and an elliptical waveguide so that the electric field component in the direction of electromagnetic wave propagation becomes almost zero at the tips of the corrugation teeth. The waveguide mode of the elliptical waveguide with a smooth tube wall can be changed to an elliptical corrugated balanced structure by combining the elliptical corrugated section with several stages of corrugated grooves and corrugated thins with variable groove width and tooth thickness. Can be converted to hybrid mode without resonance characteristics and mismatch. [Example] An example of the present invention will be described with reference to the drawings. FIG. 7 is a diagram showing an elliptical cylindrical coordinate system used to determine the depth of the corrugation groove of the matching section of the present invention, and shows a cross section of the elliptical corrugated waveguide. The following relationship holds between the elliptical cylindrical coordinate system (ξ, η, 2) and the rectangular coordinate system (x, y, z). h is a constant and is 172, which is the distance between the confocal points of the ellipse. The major axis radius a1xa6 and minor axis radius S, , bo of the elliptical corrugate are expressed as follows using equation (1). Further, if the eccentricity of each ellipse is e, , eo, the following relationship holds true. Next, FIG. 1 is a longitudinal sectional view of a matching portion of an elliptical corrugated waveguide according to an embodiment of the present invention. In Fig. 1, 1 is the tip of the corrugation in the matching part, 2 is the deepest part of the corrugation in the matching part, 3 is the depth of the corrugation groove in the matching part, 4 is the depth of the corrugation groove in the conversion corrugation matching part, and 5 is the depth of the corrugation groove in the matching part. The depth of the corrugated groove of the elliptical corrugated A-wave tube, 6 is the elliptical waveguide, 7 is the corrugation matching part near the joint with the elliptical waveguide, and 8 is the conversion corrugation up to the joint with the elliptical corrugate waveguide. The matching part, 9 is an elliptical corrugated waveguide that satisfies the balanced hybrid condition, b is the width of the groove in the matching part, t is the thickness of the corrugation tooth, 2 is the propagation direction, and E2 is the tip 1 of the corrugation tooth. Electric field in Z direction, TE. indicates an elliptical waveguide mode, and HE + + indicates an elliptical corrugated waveguide mode. FIG. 2 is a cross-sectional view of the matching portion of the elliptical corrugated waveguide of the present invention. In FIG. 2, the variable value ξ. The part between the ellipses and ξ1 indicates the depth of the groove of the matching part corrugation. Here, in order to smoothly convert from the elliptical waveguide mode (TE mode) to the elliptical corrugated balanced hybrid mode, it is necessary to
The depth 3 of the corrugated groove is determined so that the condition -0 is satisfied. Under the condition of Ez”0, (1), (2), (3)
The depth 3 of the corrugated groove can be found by expanding Maxwell's electromagnetic equation using the formula and finding the characteristic equation at the boundary of the tooth tip 1 using the Matthew function. This condition is a balanced hybrid condition of the elliptical corrugate in that the characteristic equations in both the X-axis direction and the Y-axis direction of the elliptic corrugate match. Next, after determining the depth 3 of the corrugated groove under the above conditions,
Determine the width of the corrugated groove and the thickness t of the corrugated teeth. The width of this groove is set to 0.05λ or less (0.04λ in this example) in the range of the corrugation matching part 7 near the coupling part with the elliptical waveguide, and the tooth thickness t is In the area of the matching portion 7, the width is 0.1 to 1 times the width of the groove. Next, convert corrugated iron matching part 8
Then, several stages of conversion parts are provided from the depth of the groove in the corrugation matching part 7 to the depth of the corrugation groove of the elliptical corrugated waveguide, so that the depth of the corrugation groove is smoothly matched with the depth 5 of the corrugation groove. In this case, the width of the corrugation groove and the tooth thickness t of the conversion corrugation matching part 8 are the same as in the conventional corrugation, b = 0.05 λ ~ 0
．． 3 λ, t = 0.1b ~ lb. With the above configuration, the TE and HE modes of the waveguide are
When converting to + + mode, it has conventionally been difficult to obtain good matching characteristics due to resonance phenomena caused by higher-order modes, but according to the present invention, almost perfect matching can be achieved and resonance phenomena can be eliminated. Figures 8 and 9 show the results of measuring the reflection transmission characteristics of the conventional elliptical corrugated horn antenna and the elliptical corrugated horn antenna using the matching section of the present invention in the elliptic short axis excitation mode and the elliptic long axis excitation mode. . While the conventional elliptical corrugated horn antenna causes a resonance phenomenon as shown by the circle in the figure, the elliptical corrugated horn antenna using the matching section of the present invention eliminates the resonance phenomenon and provides good frequency characteristics. It is being FIG. 3 is a longitudinal sectional view of an elliptical corrugated horn according to another embodiment of the present invention. In the drawing, 6 elliptical waveguides, 7
8 is a corrugation matching portion coupled to the elliptical waveguide, 8 is a conversion corrugation portion, and 1o is a portion opened in a horn shape to serve as an antenna. The depth of the corrugated grooves, the width of the grooves, and the thickness of the teeth in the matching section of this embodiment are determined in the same manner as in the case of the elliptical corrugated waveguide shown in FIG. [Effect of the invention] This. As described above, the present invention has the excellent effect of converting the waveguide mode of an elliptical waveguide with a smooth tube wall into an elliptical balanced hybrid mode without mismatching and eliminating resonance phenomena. Therefore, when the elliptical corrugated horn of the present invention is used as the primary radiator of an elliptical reflector antenna, the efficiency and
An antenna with excellent cross-polarization characteristics and sidelobe characteristics can be realized. 4. Brief Description of the Drawings FIG. 1 is a longitudinal sectional view of a matching part of an elliptical corrugated waveguide according to an embodiment of the present invention. Figure 2 is its cross-sectional view. FIG. 3 is a longitudinal cross-sectional view of the matching part of the elliptical corrugated bone according to one embodiment of the present invention. Figure 4 is its cross-sectional view. FIG. 5 is a longitudinal sectional view of a matching section of a conventional elliptical corrugated waveguide. Figure 6 is its cross-sectional view. FIG. 7 is a diagram showing an elliptical column coordinate system used to determine the depth of the corrugated groove of the matching part of the present invention. Figure 8 is a reflection transmission characteristic diagram of a conventional elliptical corrugated horn antenna. FIG. 9 is a reflection transmission characteristic diagram of an elliptical corrugated horn antenna using the matching section of the present invention. 1... Tip of the tooth of the corrugation, 2... The deepest part of the groove of the corrugation, 3... Cleanliness of the groove of the corrugation, 4... Depth of the groove of the corrugation of the conversion corrugation matching part, 5... ... Depth of the corrugation groove of the elliptical corrugated waveguide, 6... Elliptical waveguide, 7... Corrugation matching part, 8... Conversion corrugation part,
9... Elliptical corrugated waveguide, 10... Elliptical aperture corrugated horn.

Claims (4)

[Claims] (1) One opening surface is connected to an elliptical waveguide with a smooth tube wall, the other opening surface is connected to an antenna, and the tube wall has multiple stages of thin teeth in the circumferential direction of the ellipse. In the antenna, several stages of thin teeth in the circumferential direction of the ellipse are provided on the tube wall between the one opening surface and the elliptical waveguide, and the width of the groove of the thin teeth and the thickness of the teeth are determined by the width of the groove of the thin teeth and the thickness of the teeth. An elliptical aperture corrugated antenna characterized by a structure in which elliptical aperture corrugated parts are combined under the condition that the electric field component in the direction of electromagnetic wave propagation is almost zero at the tip. (2) The elliptical aperture corrugated antenna according to claim 1, wherein the elliptical aperture corrugated antenna is an elliptical corrugated waveguide. (3) The elliptical aperture corrugated antenna according to claim 1, wherein the elliptical aperture corrugated antenna is an elliptical corrugated horn. (4) When the free space wavelength is λ, the width of the groove on the waveguide side of the smooth tube wall is 0.05λ or less, the thickness of the tooth is 0.1 to 1 times the width of the groove, and the aperture surface The groove width on the antenna side is 0.0
5λ to 0.3λ, and an elliptical opening surface corrugate according to claims (1) to (3), having an elliptical corrugate portion with a tooth thickness of 0.1 to 1 times the width of the groove. antenna.