JP4573352B2 - Center-fed waveguide terminated power divider - Google Patents

Description

  The present invention relates to a center-fed waveguide terminal power divider, and more particularly to a center-fed waveguide termination power having a structure that can be effectively used for a center-fed waveguide type planar slot antenna in a high frequency band such as a microwave band and a millimeter wave band. Regarding the distributor.

First, the structure and configuration of the center-fed waveguide planar slot antenna will be described.
As shown in FIG. 3, the conventional general example of the center-fed waveguide type planar slot antenna (hereinafter referred to as a first example) has an antenna base unit 100y and its radio wave radiation side as shown in FIG. The slot plate 200y is disposed and fixed on the surface of the plate.

  This antenna base portion 100y has a quadrangular plate shape, and a power supply waveguide hole 110y formed so as to penetrate the center point portion on the front and back sides, and the power supply guide on the center line of the radio wave radiation side surface. A feed waveguide 120y extending to be connected to the wave hole 110y, and a plurality of radiation waveguides 140y extending to both sides of the feed waveguide 120y are connected to each end. Further, on the bottom surface (123) of the feed waveguide 120y, one dielectric post 124, 125 is formed at a portion corresponding to each radiation waveguide 140y, one at the end portion and four at the other portions. In addition, these dielectric posts have a structure in which power from the feed waveguide 120y is distributed to the radiation waveguide 140y (or vice versa).

On the other hand, a plurality of slots 210y are formed in the slot plate 200y corresponding to the respective radiation waveguides 140y of the antenna base portion 100y (however, they are not formed in the portion of the feed waveguide 120y). ).
In this center-fed waveguide type planar slot antenna, the feeding waveguide 120y and each radiating waveguide 140y have their lower surfaces (123, 142y) as one common plane, and the radio wave radiation plane is also a plane. Therefore, all the waveguides (120y, 140y) have the same vertical and horizontal directions, and the opening surface on the radio wave radiation surface side has the vertical and horizontal dimensions on the wide side. 4A and 4B are layout diagrams of the radiation waveguide termination portion.

  In this first example, the width dimension of the feed waveguide 120y with respect to the radio wave radiation surface is also increased, and the slot 210y is not formed in this portion of the slot plate 200y, so the slot 210y in the slot plate 200y is formed. There is a problem that the antenna directivity is deteriorated, for example, the dimension d of the non-existing portion is increased and the side lobe level is increased.

  In view of this, the inventors of the invention of Japanese Patent Application No. 2004-212909 (hereinafter referred to as a second example) aim to improve the antenna directivity by reducing the dimension d of the portion where the slot 210y is not formed. Then, we proposed a center-fed waveguide type planar slot antenna with a structure in which the orientation of the feed waveguide is rotated 90 degrees with respect to the above-mentioned one and the short side in the vertical and horizontal directions is open to the radio wave radiation surface (Fig. 5, see FIG.

  In the second example, since the width dimension of the power supply waveguide 120 on the radio wave emission surface is on the short side thereof, the portion of the slot plate 200 corresponding to the power supply waveguide is a portion where no slot is formed. Therefore, the antenna directivity can be improved accordingly.

  In the present invention, when the power of the feed waveguide 120 is distributed to each radiation waveguide 140, the reflection suppression wall 121 is disposed on the bottom surface 122 of the feed waveguide corresponding to each radiation waveguide 140. A structure in which the coupling adjustment unit 130 is provided in a portion where each radiation waveguide is connected to the feeding waveguide is a main configuration. Furthermore, also in the terminal portion of the feed waveguide 120, as shown in FIG. 6 (the terminal portion of FIG. 5 is enlarged and shown in a perspective view), the reflection suppression wall 121 and the coupling adjustment unit are compared with the radiation waveguide 140. Although 130 is provided, the end wall of the feed waveguide 120 is only formed to be the same wall as the outer side wall of the radiation waveguide 140 (see, for example, Patent Document 1).

Regarding the technology for feeding the power of the feeding waveguide to the radiating waveguide, which corresponds to the first and second examples in the central feeding waveguide type planar slot antenna, the inventors have announced the conference. (For example, see Non-Patent Document 1).
Japanese Patent Application No. 2004-212909 Yasuhiro Tsunemitsu and two others, “E-plane direction cross-branch for centrally fed waveguide slot array antenna”, IEICE 2004 Communication Society Conference Proceedings 1

  In the first example in the background art described above, in the antenna base unit 100y, the feed waveguide 120y and the radiation waveguides 140y have the same radio wave radiation surface with the bottom surface being the same surface and the vertical and horizontal directions being the same direction. A dielectric post 124, 125 is provided on the bottom surface of the feed waveguide 120y, and the power of the feed waveguide 120y is transferred to each radiation waveguide by the posts (124, 125). The slot plate 200y has a slot 210y corresponding to each of the radiation waveguides 140y, but no slot is formed in the portion of the feed waveguide 120y. There is a problem that the antenna directivity deteriorates. In the second example in which this point is improved, the feed waveguide is rotated 90 degrees and arranged. Therefore, although the portion without the slot in the slot plate is reduced and the antenna directivity is improved, the end portion of the feed waveguide is flush with the outer side surface of the outermost radiation waveguide 140y. And, the position of the reflection suppression wall 121 only considers power distribution from the power supply side, and does not consider the reflection component from the outermost wall surface of the feed waveguide 120. Due to this reflection component, there is a problem that power supply to each radiation waveguide becomes insufficient. Also, the post technique in the first example cannot be used because the bottom surface between the feed waveguide and each radiation waveguide is different.

  In view of such problems in the background art, an object of the present invention is to provide each radiation waveguide at the end portion of the feed waveguide even if the bottom surface of the feed waveguide and each radiation waveguide are not coplanar. It is an object of the present invention to provide a centrally fed waveguide terminal power distributor that can sufficiently supply power to the tube.

Central feed waveguide terminating power divider of the present invention, on both sides broad wall of the pipe axial section a rectangular feed waveguide, also the radiation waveguide tube axis direction cross-section rectangular, said radiating waveguide One wide wall surface of the feed waveguide is flush with one narrow wall surface of the feed waveguide and the tube axis direction of the radiation waveguide is perpendicular to the tube axis direction of the feed waveguide. A plurality of sets counted in the tube axis direction are arranged connected to the feeding waveguide, and a reflection suppression wall is arranged on the other narrow wall surface of the feeding waveguide at the connection portion with the radiation waveguide. A centrally fed waveguide terminating power distributor in an apparatus for feeding the power of the feeding waveguide to the radiating waveguide by these reflection suppression walls, the radiation being connected to the terminating portion of the feeding waveguide together arranged reflected suppression wall connecting portion of the waveguide suppresses the reflected waves from the corresponding radiating waveguide Characterized in that it is intended to suppress the reflected wave from the end face of the feed waveguide.

  In addition, the coupling window, which is a connection portion between the radiating waveguide connected to the terminal end portion of the feeding waveguide and the feeding waveguide, has a transverse cross section of the radiating waveguide itself, and the feeding window directly. The center feeding waveguide termination power divider having a structure coupled to a waveguide.

Furthermore, wherein the end face of the feed waveguide, its corners, a spot facing and the center feed waveguide terminating power divider is a corner rounded with structure on the work by die casting.

  In the present invention, the arrangement position and height of the reflection suppression wall corresponding to the radiation waveguide connected to the termination portion of the feed waveguide are set so that the reflected wave from the termination surface of the feed waveguide and the corresponding radiation guide are arranged. Since the position and height are such that the reflected wave from the wave tube is suppressed, these reflected waves can be eliminated, and power can be sufficiently supplied to each radiating waveguide including the terminal portion.

The best mode for carrying out the present invention is that a plurality of radiating waveguides are arranged on both sides of the feeding waveguide with one end connected to the feeding waveguide, A central feeding waveguide in a device in which a reflection suppression wall is disposed at a connection portion of the bottom surface with the radiation waveguide, and the power of the feeding waveguide is fed to the radiation waveguide by the reflection suppression wall. A reflection power suppression wall for supplying power to the radiating waveguide connected to the terminal end portion of the power supply waveguide is a terminal power distributor, and the reflected wave from the terminal surface of the power supply waveguide It has a structure and configuration arranged at a position and height that suppresses the reflected wave from the radiating waveguide.
The arrangement position of the reflection suppression wall of the termination portion with respect to the termination surface of the feeding waveguide is a position separated by a quarter wavelength of the wavelength in the waveguide,
In addition, the coupling window, which is a connection portion between the radiating waveguide connected to the terminal end portion of the feeding waveguide and the feeding waveguide, has a transverse cross section of the radiating waveguide itself, and the feeding window directly. A structure coupled to a waveguide,
Furthermore, the end face of the power supply waveguide has a structure in which a corner is rounded at the corner.

Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a layout view of each part (three-sided view) and a perspective view of each part layout viewed from three directions for explaining an embodiment of the present invention, and FIG. FIG. 5 is a top plan view seen from above when a plane in which one narrow wall surface of the waveguide 10 is the same plane is horizontal, and it is shown on the right side from the S-shaped curve so that the inside of the feed waveguide can be seen. The figure which notched the narrow wall surface, (a) is the side view which looked at (b) from the left, (c) is the side view which looked at (b) from the downward direction. (D) is the perspective view which looked up the thing of (a) from the lower surface side (the side which the paper surface faces). In such an arrangement, one narrow wall surface of the power supply waveguide 10 becomes the top surface, and the other narrow wall surface becomes the bottom surface 11. FIG. 2 is a view similar to the perspective view of FIG. 1 (d), showing reflection in the tube as indicated by a dotted arrow.
In this embodiment, a plurality of radiation waveguides 20 are arranged on both sides of the feed waveguide 10 with one end connected to the feed waveguide 10, The reflection suppression walls 30 are arranged in correspondence with the connection portions with the respective radiation waveguides 20, and the electric power from the feeding waveguide 10 is fed to these radiation waveguides 20 by these reflection suppression walls. The reflection suppression wall 30 for supplying power to the radiating waveguide 20 that is a centrally fed waveguide terminating power distributor and is connected in proximity to the terminating portion of the feeding waveguide 10 The waveguide 10 is disposed at a position and height that suppresses the reflected wave from the end face 12 of the waveguide 10 and the reflected wave from the radiation waveguide 20 at the end portion. In order to suppress such a reflected wave, the arrangement position (dimension L in FIG. 1) of the reflection suppression wall 30 at the end portion is set to a position separated from the end surface 12 by approximately ¼ wavelength of the wavelength in the waveguide. Yes.

In addition, the radiation waveguide 20 connected in the vicinity of the terminal end portion of the feed waveguide 10 and the coupling window 40 that is a connection portion between the feed waveguide 10 are connected to the feed waveguide 10 and the radiation waveguide. In order to maximize the coupling with the radiating waveguide 20, there is no coupling adjustment unit 130 as in the second example of the background art (FIG. 6) , and the cross sectional opening of the radiating waveguide 20 itself is directly fed by itself. The structure is combined with the tube 10.
Further, the end face 12 of the power supply waveguide 10 is provided with a corner roundness 50 by counterbore processing or die casting at the corner portion. It works even when the corner is not rounded.

As described above, when the reflection suppression wall 30 closest to the terminal end portion is disposed at a position that is approximately ¼ wavelength away from the terminal end surface 12 of the feed waveguide 10 and the height thereof is adjusted, Since the reflected wave a is in reverse phase with respect to the wave from the power supply side, it cancels out in reverse phase and is suppressed and the reflected wave does not return to the power supply side or decreases. Note that the reflected wave b from the radiation waveguide 20 is reflected by the reflection suppression wall 30 and reflected by the end face 12 of the feed waveguide 10, and can be canceled in the same manner. Therefore, the power from the feeding waveguide 10 can be sufficiently supplied to each radiation waveguide 20.

In this embodiment, since the position of the reflection suppression wall at the end portion is L = 1/4 · λ, the end surface 12 portion of the feed waveguide 10 protrudes from the narrow wall surface outside the radiation waveguide 20. It is made.
The portion corresponding to the antenna base portion 100 in the second example of the background art including the feeding waveguide 10 and the radiation waveguide 20 can be manufactured in a single layer structure by counterboring or the like.

It is each part arrangement | positioning figure (three face drawing) seen from three directions for describing one Example of this invention, and each part arrangement | positioning perspective view. It is each part arrangement | positioning perspective view for demonstrating the effect in one Example of this invention. It is a top view of the antenna base part and slot plate for demonstrating the 1st example of background art. It is the top view and perspective view of the electric power feeding waveguide termination | terminus part in the 1st example of background art. It is a top view of the antenna base part and slot plate for demonstrating the 2nd example of background art. It is a perspective view of the electric power feeding waveguide termination part in the 2nd example of background art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Feed waveguide 11 Bottom 12 End surface 20 Radiation waveguide 30 Reflection suppression wall 40 Joint window 50 Corner round 100,100y Antenna base part 110,110y Power supply waveguide hole 120,120y Feed waveguide 121 Reflection suppression wall 122 , 123 Feed waveguide bottom surface 124, 125 Dielectric post 130 Coupling adjustment unit 140, 140y Radiation waveguide

Claims (3)

On either side wide wall of the pipe axial section a rectangular feed waveguide, also axial direction of the tube cross-section a rectangular radiating waveguides, wide wall of said radiating waveguide and one narrow wall of the feed waveguide A plurality of sets are connected to the feed waveguide so that they are on the same plane and the tube axis direction of the radiation waveguide is orthogonal to the tube axis direction of the feed waveguide. A reflection suppression wall is disposed on the other narrow wall surface of the feed waveguide at the connection portion with the radiation waveguide, and the power of the feed waveguide is guided by the reflection suppression wall by the reflection suppression wall. A centrally-fed waveguide terminating power distributor in a device that feeds the wave tube, and a reflection suppression wall disposed at a connecting portion of the radiating waveguide connected to the terminating portion of the feeding waveguide even while suppressing reflected waves from the radiating waveguide which suppresses the reflected wave from the end face of the feed waveguide Central feed waveguide terminating power divider, characterized in that it. The coupling window, which is a connection portion between the radiating waveguide connected to the terminal end portion of the feeding waveguide and the feeding waveguide, has a cross section of the radiating waveguide itself, and the feeding waveguide directly. The center-fed waveguide terminated power distributor of claim 1, wherein the center-fed waveguide terminated power distributor is a structure coupled to a tube. 3. The central feed guide according to claim 1, wherein the end face of the feed waveguide has a structure in which a corner portion is rounded by counterbore processing or die casting. Wave tube termination power distributor.

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