JP4477664B2 - H-plane T-branch waveguide - Google Patents

Description

  The present invention relates to an H-plane T-branch waveguide for branching or synthesizing microwaves and millimeter waves.

An H-plane T-branch waveguide is used in a circuit for branching or synthesizing microwaves or millimeter waves (for example, see Patent Document 1).
A base body in which a concave feeding waveguide and a plurality of concave radiating waveguides fed from the feeding waveguide are provided in parallel on one surface of a plate-like conductive member corresponds to each radiating waveguide. A waveguide slot array antenna incorporating a branching waveguide is constructed by closely contacting a slot plate provided with a row of slots for radiation along its longitudinal direction. As the close contact structure at this time, the slot plate is bonded to the base body with an adhesive or an adhesive sheet on the plane of the portion other than the concave portion of the base body, and conductive bumps previously provided at the bonding locations of the slot plate. Penetrates the adhesive layer or the adhesive sheet and is conductively connected to the base body (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 5-160612 JP 2004-015579 A

However, since it is necessary to provide a concave waveguide on one surface of the plate-like conductive member, or to provide a conductive bump on the slot plate provided with the row of slots for radiation, the base plate and the slot plate are There is a problem that it becomes expensive.
Further, when an H-plane T-branch waveguide as in Patent Document 1 is manufactured by a lamination method as in Patent Document 2, a slot plate provided with a radiation slot, a post plate provided with a post, a main waveguide plate, and a branch The waveguide plate must be diffusion bonded, but the post cannot be pressed because it protrudes inside the main waveguide. For this reason, the slot plate and the post plate must be diffusion-bonded first, followed by diffusion-bonding with the other plate, which requires a plurality of diffusion bonding steps, resulting in a high bonding cost.

  An object of the present invention is to provide a low-cost H-plane T-branch waveguide that can be manufactured by a low-cost component and a single diffusion bonding process.

The H-plane T-branch waveguide according to the present invention includes a main waveguide (1) formed by joining a first component (4) and a second component (5), and the second component ( and the main waveguide path provided in 5) (1) one of said first component and having a Semakabe (branch waveguide path connecting the T type 1a) (3) (4) and the second H-plane T-branch including a parallel center lines axial center line of the second part (5) joint surface between the perpendicular to the wide walls (1b) of the main waveguide path (1) and the wide walls (1b) In the waveguide, the first component (4) is formed by laminating a plurality of metal plates by diffusion bonding, and at least one of the metal plates has an opposing surface on the main waveguide (1). is composed of a rectangular connecting the two rectangular and the two rectangular opposing surface parallel to constitute a part of the wide wall (1b) of said two straight Cuboid connecting the opposing surfaces of the body constitutes a T branch matcher over the center line from one Semakabe (1a) of the main waveguide path (1), said first part (4) and the The second part (5) was joined by screw tightening.

  The effect of the H-plane T-branch waveguide according to the present invention includes the center line of the wide wall of the main waveguide path where the joint surface of the first component and the second component does not cross the current flowing through the main waveguide path. Since the transmission loss is small even if a gap is generated on the joint surface between the first part and the second part, it is possible to employ an inexpensive screw joining method for joining the first part and the second part. is there.

Embodiment 1 FIG.
1 is a perspective view of a waveguide slot antenna to which an H-plane T-branch waveguide according to Embodiment 1 of the present invention is applied. 2 is a cross-sectional view taken along a line AA in FIG.
In the waveguide slot antenna to which the H-plane T-branch waveguide according to the first embodiment of the present invention is applied, the radiation slots 2 are arranged in a row on one narrow wall 1a of the main waveguide 1. The H-plane T-branch waveguide is composed of a main waveguide path 1 and a branch waveguide path 3 that branches in a T-shape into the main waveguide path 1 in a direction parallel to the transverse magnetic field of the main waveguide path 1. The
The main waveguide 1 is formed by joining the first component 4 and the second component 5. The branching waveguide 3 is provided in the second component 5, and is branched in a T shape with respect to the main waveguide 1 by joining the first component 4 and the second component 5 with screws (not shown). To do.

FIG. 3 is a perspective view of the slot plate and the post plate according to Embodiment 1 of the present invention.
The first component 4 is composed of a flat slot plate 7 in which the radiation slots 2 are arranged in a row, and a flat post plate 8 in the shape of a Chinese character in plan view.
As shown in FIG. 3A, the slot plate 7 is manufactured by masking and etching other than a portion penetrating a flat plate such as a stainless steel plate as the radiation slot 2. The radiation slot 2 may be formed by a method such as punching.

As shown in FIG. 3B, the post plate 8 connects a flat plate such as a stainless steel plate between the walls 11 a and 11 b on both sides parallel to the axis of the main waveguide 1 and the center of the walls 11 a and 11 b. A T-branch matching unit (hereinafter referred to as a post) 12 is manufactured by masking and etching. In addition, the walls 11a and 11b and the post 12 may be removed by a method such as punching.
Further, the thickness of the post plate 8 is H / 2 of the height H of the wide wall 1 b of the main waveguide 1, that is, half the distance of the narrow walls 1 a on both sides of the main waveguide 1.
Since the post 12 is left as a flat plate, a central line parallel to the axial line of the wide wall 1b of the main waveguide 1 from the surface facing the main waveguide 1 of the slot plate 7 in the main waveguide 1 Protrudes up to.

  The first component 4 is produced by laminating the slot plate 7 and the post plate 8 in the thickness direction and performing diffusion bonding while applying pressure from both sides. In this diffusion bonding, since the post 12 has the same thickness as the walls 11a and 11b, the post 12 and the slot plate 7 are surely diffusion-bonded because the pressure can be uniformly applied to the walls 11a and 11b.

FIG. 4 is a perspective view of a second part according to Embodiment 1 of the present invention.
As shown in FIG. 4, the second component 5 includes walls 13a and 13b extending in the axial direction of the main waveguide 1 constituting a part of the wide wall 1b of the main waveguide 1, and the main waveguide. It is manufactured by an aluminum die-casting method using a mold in which a branched waveguide 3 having a direction parallel to the transverse magnetic field of the path 1 is formed.
The height of the walls 13a and 13b is H / 2 which is half the height H of the wide wall 1b of the main waveguide 1.

By tightening the first component 4 and the second component 5 with screws (not shown), the main waveguide 1 in which the radiation slot 2 is provided in the narrow wall 1a and the T-shaped parallel to the transverse magnetic field of the main waveguide 1 An H-plane T-branch waveguide having a branching waveguide path 3 that branches at a line is formed.
Ports P 1 and P 2 are formed at both ends of the main waveguide 1, and a port P 3 is formed at one end of the branch waveguide 3.

Next, in order to compare with the H-plane T-branch waveguide according to the first embodiment of the present invention, the height of the T-branch matching unit is not half the height H of the wide wall 1b of the main waveguide 1 A waveguide slot antenna to which the H-plane T-branch waveguide is applied will be described.
FIG. 5 is a perspective view of a waveguide slot antenna to which an H-plane T-branch waveguide of a comparative example for comparison with the H-plane T-branch waveguide according to the first embodiment of the present invention is applied. 6 is a cross-sectional view taken along line BB in FIG.
Also in the waveguide slot antenna to which the H-plane T-branch waveguide of this comparative example is applied, the radiation slots 2 are arranged in a row on one narrow wall 1a of the main waveguide 1. The H-plane T-branch waveguide of the comparative example is also the main waveguide path 1 and the branched waveguide path 3 that branches in a T-shape to the main waveguide path 1 in a direction parallel to the transverse magnetic field of the main waveguide path 1. Consists of
However, the main waveguide 1 of the comparative example is formed by diffusion bonding the first component 4B, the two main waveguide plates 20, and the branch waveguide plate 21. Further, the branching waveguide 3 of the comparative example is provided on the branching waveguide plate 21 by diffusion bonding the first component 4B, the two main waveguide plates 20, and the branching waveguide plate 21. The main waveguide 1 branches off in a T shape.

FIG. 7 is a perspective view of a slot plate and a post plate constituting a waveguide slot antenna of a comparative example. FIG. 8 is a perspective view of a main waveguide plate and a branched waveguide plate constituting a waveguide slot antenna of a comparative example.
Since the joint surface of each component in the waveguide slot antenna of the comparative example is shifted from the center line of the wide wall 1b of the main waveguide path 1, if there is a gap in the joint surface, transmission loss due to the flowing current increases. The gap is not left on the joint surface by diffusion bonding. Therefore, the parts constituting the waveguide slot antenna of the comparative example use the same type of metal such as stainless steel.
The first component 4B is composed of a flat slot plate 7 in which the radiation slots 2 are arranged in a row and a flat post plate 8B having a Chinese character cross section.
As shown in FIG. 7A, the slot plate 7 is manufactured by masking and etching other than a portion penetrating a flat plate such as a stainless steel plate as the radiation slot 2.

As shown in FIG. 7B, the post plate 8B connects a flat plate such as a stainless steel plate between the walls 22a and 22b on both sides parallel to the axis of the main waveguide 1 and the center of the walls 22a and 22b. It is produced by masking and etching other than the post 23.
Further, the thickness of the post plate 8B is less than half the height H of the wide wall 1b of the main waveguide path 1, that is, the distance between the narrow walls 1a on both sides of the main waveguide path 1.
Since the post 23 is left as a flat plate, a center line parallel to the axial center line of the wide wall 1b of the main waveguide 1 from the surface facing the main waveguide 1 of the slot plate 7 in the main waveguide 1 It projects over the foreground.
As shown in FIG. 8A, the main waveguide plate 20 is produced by etching a flat plate such as a stainless plate, and the height of the main waveguide plate 20 is wider than that of the main waveguide path 1. It exceeds one half of the height H of the wall 1b.
As shown in FIG. 8B, the branch waveguide plate 21 is manufactured by masking and etching a flat plate such as a stainless steel plate except for a portion where the branch waveguide path 3 is formed.

When the components constituting the waveguide slot antenna of the comparative example are diffusion-bonded, there is no component in contact with one surface of the post 23 provided on the post plate 8B, so the slot plate 7 and the post plate 8B are first attached. The first component 4B is integrated by diffusion bonding, and then the first component 4B, the main waveguide plate 20 and the branch waveguide plate 21 are stacked and diffusion bonded.

Since the height of the post 23 is different from half of the height of the wide wall 1b of the main waveguide 1 in the H-plane T-branch waveguide of this comparative example, the constituent parts are diffused and joined in multiple times. This increases the joining cost.
In addition, since all must be diffusion-bonded, many parts must be manufactured by a time-consuming method such as etching, which increases the material cost.

  On the other hand, in the H-plane T-branch waveguide according to the first embodiment of the present invention, the height of the post 12 is half that of the wide wall 1b of the main waveguide 1, so that the slot plate 7 and the post plate 8 are diffused. Since the joining surface of the joined first component 4 and second component 5 includes the center line of the wide wall 1b of the main waveguide 1, there is a gap between the joining surfaces of the first component 4 and the second component 5. Even if there is, there is no current crossing the center line, and transmission loss due to current hardly occurs. Therefore, a simple joining method such as screw tightening can be employed instead of the time-consuming joining method such as diffusion joining of the first component 4 and the second component 5.

Moreover, since the 1st component 4 and the 2nd component 5 should just be joined by screwing etc., die cast products, such as aluminum, can be used for the 2nd component 5, for example, and a low price component is used. it can.
From these facts, it is possible to use a low-priced component and a simple joining method, and therefore it is possible to provide a low-cost H-plane T-branch waveguide.

  Further, in the diffusion bonding process of the first component 4, since the tops of both of the posts 12 of the post plate 8 are located on the same plane as the tops of both the walls 11 a and 11 b, the slot plate 7 and the post plate 8 When the pressure is applied from both sides so as to eliminate the gap in order to ensure diffusion bonding, the post 12 and the slot plate 7 can be reliably diffusion bonded by applying the same pressure as the walls 11a and 11b to the post 12 as well.

Embodiment 2. FIG.
FIG. 8 is a perspective view separated by a part of a waveguide slot antenna to which an H-plane T-branch waveguide according to Embodiment 2 of the present invention is applied.
The H-plane T-branch waveguide according to the second embodiment of the present invention is different from the H-plane T-branch waveguide according to the first embodiment except for the second component 5B. The same reference numerals are given and description thereof is omitted.
The second component 5B according to the second embodiment of the present invention is different from the second component 5B according to the first embodiment of the present invention in that a choke groove 25 is added to the top of the walls 13a and 13b of the second component 5 according to the first embodiment of the present invention. Are the same, the same parts are denoted by the same reference numerals, and description thereof is omitted.

  Thus, by providing the choke groove 25 on the top of the walls 13a and 13b of the second component 5B, transmission loss due to the gap generated in the joint surface between the first component 4 and the second component 5B can be further reduced. Can do.

  In the above-described embodiment, the example in which the H-plane T-branch waveguide is applied to the waveguide slot antenna has been described. However, the present invention is not limited to this.

1 is a perspective view of a waveguide slot antenna to which an H-plane T-branch waveguide according to Embodiment 1 of the present invention is applied. It is sectional drawing in the AA cross section of FIG. It is a perspective view of the slot board and post board which comprise the H surface T branching waveguide which concerns on Embodiment 1 of this invention. It is a perspective view of the 2nd component which comprises the H surface T branching waveguide which concerns on Embodiment 1 of this invention. It is a perspective view of the waveguide slot antenna to which the H surface T branching waveguide of a comparative example is applied. It is sectional drawing in the BB cross section of FIG. It is a perspective view of the slot board and post board which comprise the H surface T branching waveguide of a comparative example. It is a perspective view of the main waveguide board and branching waveguide board which comprise the H surface T branching waveguide of a comparative example. It is a perspective view of the 2nd component which comprises the H surface T branching waveguide which concerns on Embodiment 2 of this invention.

Explanation of symbols

  1 Main waveguide path, 1a Narrow wall (of main waveguide path), 1b Wide wall (of main waveguide path), 2 Radiation slot, 3 Branch waveguide path, 4, 4B First part, 5, 5B Second part, 7 slot plate, 8, 8B post plate, 11a, 11b wall, 12 post, 13a, 13b wall, 20 main waveguide plate, 21 branch waveguide plate, 22a, 22b wall, 23 post, 25 Choke groove, P1, P2, P3 ports.

Claims (2)

The first component (4) and the second part (5) main waveguide path is formed by joining a (1) and the provided second part (5) and the main waveguide path (1 ) Has a branched waveguide (3) coupled to the narrow wall (1a) in a T-shape, and the joint surface between the first component (4) and the second component (5) is the main in the H-plane T-branch waveguide comprising parallel center lines axial center line of the orthogonal and the wide wall wide wall (1b) (1b) of Namikanro (1),
The first component (4) is formed by laminating a plurality of metal plates by diffusion bonding.
At least one of the metal plates connects two parallel rectangular parallelepipeds whose opposing surfaces constitute a part of the wide wall (1b) of the main waveguide (1) and opposing surfaces of the two rectangular parallelepipeds. A rectangular parallelepiped
Cuboid connecting the two rectangular opposing surfaces constitute the T branch matcher over the center line from one Semakabe (1a) of the main waveguide path (1),
The H-plane T-branch waveguide, wherein the first part (4) and the second part (5) are joined by screwing.   2. The H according to claim 1, wherein the first part or the second part is provided with a choke on a surface to be joined to the second part or the first part to be joined. Planar T-branch waveguide.

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