JP2011199353A - H plane t branch waveguide - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems with a conventional method for matching an H plane T branch waveguide, wherein design is complicated because of many matching elements and cost reduction is difficult because of the complicatedness of a structure.SOLUTION: By taking a simple structure including a metal partition on one E plane of a main waveguide near a connection between the main waveguide and a branch waveguide of the H plane T branch waveguide, impedance matching from an input terminal side of the main waveguide is achieved and an H plane T branch waveguide of which a manufacturing process can be simplified (manufacturing cost reduction) is obtained.

Description

  The present invention relates to an H-plane T-branch waveguide used for power distribution and synthesis in the microwave and millimeter wave bands.

  In an H-plane T-branch waveguide in which one end of the main waveguide is used as an input terminal, the other end is joined to the H-plane of the branching waveguide, and two ends of the branching waveguide are used as output terminals. For example, an H-plane T-branch waveguide structure as shown in Patent Document 1 is known as one that performs impedance matching from the input terminal side of the main waveguide.

JP 2005-167879 A

  However, in the conventional H-plane T-branch waveguide as shown in Patent Document 1, there are two locations on the main waveguide-side H-plane in the vicinity of the junction between the main waveguide and the branch waveguide, and the junction is led. It is necessary to provide matching elements on the H-plane of the branching waveguide facing the wave tube. The design is complicated due to the large number of matching elements, and the manufacturing cost is difficult to reduce because the structure is complicated. There was a problem.

  The present invention has been made to solve the above-described problems, and an object thereof is to obtain an H-plane T-branch capable of impedance matching from the input terminal side of the main waveguide with a simple structure. .

  The H-plane T-branch waveguide according to the present invention has one end as a first terminal and the other end as a connection terminal, and a main waveguide having a pair of E surfaces and a pair of H surfaces, and one end as a second terminal. And the other end is a third terminal, the periphery is composed of a pair of E surfaces and a pair of H surfaces, and a connection port is formed in a part of one of the H surfaces to connect the connection terminal of the main waveguide. A branch waveguide connected to the connection port, and the main waveguide has a step shape in which one of the E surfaces is bent inside the main waveguide around the connection terminal, An interval between the pair of E surfaces around the connection terminal is smaller than an interval between the pair of E surfaces around the first terminal.

  According to the present invention, impedance matching from the input terminal side of the main waveguide can be achieved with a simple structure including a metal partition wall on one E surface on the main waveguide side in the vicinity of the junction between the main waveguide and the branch waveguide. Can be realized.

3 is a perspective view showing a configuration of an H-plane T-branch waveguide in the first embodiment. FIG. It is sectional drawing along the AA line (FIG. 1) for demonstrating the metal partition for an alignment in Embodiment 1. FIG. 6 is a diagram illustrating an example of reflection characteristics of the H-plane T-branch waveguide in the first embodiment. FIG. 6 is a perspective view showing a configuration of an H-plane T-branch waveguide in a second embodiment. FIG. It is sectional drawing along the AA line (FIG. 4) for demonstrating the metal partition for an alignment in Embodiment 2. FIG.

  The H-plane T-branch waveguide according to the present invention can be used as a distributor or a combiner by switching the input / output direction. Hereinafter, a case where the H-plane T branch waveguide is applied as a distributor will be described.

Embodiment 1 FIG.
1 is a perspective view showing a configuration of an H-plane T-branch waveguide according to Embodiment 1 of the present invention, and FIG. 2 is taken along line AA in the H-plane T-branch waveguide of FIG. FIG.
1 and 2, reference numeral 1 denotes a main waveguide having a pair of wide surfaces (E surface) and a pair of narrow surfaces (H surface) and having a rectangular section perpendicular to the longitudinal direction, and 2 is also a pair of wide surfaces. A branch waveguide having a plane (E plane) and a pair of narrow planes (H plane) and having a rectangular cross section perpendicular to the longitudinal direction, 3 is one narrow plane (H plane) of the branch waveguide 2 The provided connection port 4 is a connection terminal connected to the connection port 3 provided in the branching waveguide 2 at one end of the main waveguide 1, and thus the connection terminal 4 of the main waveguide 1. And the connection port 3 of the branching waveguide 2 are connected to form an H-plane T-branching waveguide 9.
The main waveguide 1 is provided with an input terminal 5 (first terminal) on the side opposite to the connection terminal 4, and the branch waveguide 2 has a first output terminal 6 (second terminal) at one end. The second output terminal 7 (third terminal) is provided at the other end.

Here, 8 is a matching metal partition wall provided on one wide surface of the main waveguide 1 side of the connection portion (connection port 3 and connection terminal 4) between the main waveguide 1 and the branch waveguide 2. The matching metal partition wall 8 is formed with a step of a bent convex portion formed by bending one wide surface (E surface) of the main waveguide 1 to the inside of the tube, and the height from the wide surface of the main waveguide 1 is high. H, and the length extending from the connection terminal 4 connected to the connection port 3 to the main waveguide 1 side is L.
As described above, the H-plane T-branch waveguide of the first embodiment includes the matching metal partition wall 8 having a structure in which the surface is bent inward on a part of the wide surface of the main waveguide 1.
With regard to the distance between the pair of wide surfaces (E surfaces) constituting the main waveguide 1, the pair of wide surfaces is provided around the connection terminal 4 in comparison with the periphery of the input terminal 5 due to the matching metal partition wall 8. (E surface) It becomes the structure where the space | interval of mutual becomes narrow. In addition, regarding the distance between the pair of narrow surfaces (H surfaces) constituting the main waveguide 1, the periphery of the connection terminal 4 and the periphery of the input terminal 5 are the same.
Further, one wide surface (E surface) constituting the main waveguide 1 and one wide surface (E surface) constituting the branching waveguide 2 are flush with each other and form the same continuous surface. In addition, the main waveguide 1 and the branching waveguide 2 are connected by a connection portion (connection port 3 and connection terminal 4).

Next, the operation will be described.
The millimeter wave or microwave band RF signal input from the input terminal 5 is distributed to the first output terminal 6 and the second output terminal 7 and output.
Here, the matching metal partition 8 in the T-branch waveguide 9 shown in FIGS. 1 and 2 functions as a capacitive reactance connected in parallel, so that the length L extending to the main waveguide 1 side and the main waveguide are increased. Impedance matching from the input terminal 5 side can be performed by appropriately adjusting the height H from the wide surface of the tube 1.

FIG. 3 shows frequency characteristics as seen from the input terminal of the H-plane T-branch waveguide 9 of the present invention shown in FIG. 1 (the horizontal axis is the normalized frequency (normalized by the center frequency), and the vertical axis is the reflection characteristic (dB)). It is an electromagnetic field analysis result. In FIG. 3, the height H is about 0.7 times the interval between the narrow surfaces of the main waveguide 1, and the length L extending toward the main waveguide 1 is 0.06λ with respect to the wavelength λ. Is the result of
From the result of FIG. 3, it can be seen that the H-plane T-branch waveguide 9 of the first embodiment can be impedance matched at the center frequency.

  As described above, the H-plane T-branch waveguide of the first embodiment can achieve impedance matching from the input terminal side of the main waveguide with a simple structure.

  In the above description, an example in which an H-plane T-branch waveguide is used as a distributor has been described. However, an H-plane T-branch waveguide may be used as a synthesizer. can get. In this case, the input terminal 5 is an output terminal, and the first and second output terminals 6 and 7 are first and second input terminals, respectively.

Embodiment 2. FIG.
In the first embodiment, a matching metal partition wall 8 having a structure in which the surface is bent inward is provided on a part of the wide surface of the main waveguide 1. However, in the second embodiment, the main waveguide 1 is provided inside the main waveguide 1. A metal protrusion 80 is provided.

FIG. 4 is a perspective view showing the configuration of the H-plane T-branch waveguide according to the second embodiment. FIG. 5 is a cross-sectional view taken along line AA in the H-plane T-branch waveguide of FIG.
In FIGS. 1 and 2, 21 is a main waveguide having a pair of wide surfaces and a pair of narrow surfaces and having a rectangular cross section perpendicular to the longitudinal direction, and 22 similarly has a pair of wide surfaces and a pair of narrow surfaces. The branch waveguide has a rectangular cross section orthogonal to the longitudinal direction, 23 is a connection port provided on one narrow surface (H surface) of the branch waveguide 2, and 24 is one end of the main waveguide 1. This is a connection terminal that is connected to the connection port 23 provided in the branching waveguide 2 at the portion, and the connection terminal 24 of the main waveguide 21 and the connection port 23 of the branching waveguide 22 are thus connected. , An H-plane T-branch waveguide 29 is formed. The components having the same functions as those of the first embodiment, such as the input terminal 5 and the output terminals 6 and 7, are denoted by the same reference numerals and description thereof is omitted.

Here, reference numeral 28 denotes a metal protrusion provided on the inner tube wall of the main waveguide 1 at a connection portion (connection port 23 and connection terminal 24) between the main waveguide 21 and the branch waveguide 22. The metal protrusion 28 is provided on one wide surface of the main waveguide 1 and has a rectangular parallelepiped shape. The height of the metal protrusion 28 from the wide surface of the main waveguide 1 is H, the length extending from the connection terminal 24 connected to the connection port 23 toward the main waveguide 1 is L, and the width is the width T of the main waveguide 21. Is the same. One surface of the metal protrusion 28 is provided in contact with the connection port. In other words, the metal projection 28 is set so that the H surface provided with the connection port and one surface of the metal projection 28 form the same continuous surface. By installing, the area becomes smaller than the area of the cross section of the main waveguide 11 on the input terminal 5 (first terminal) side.
As described above, in the H-plane T-branch waveguide of the second embodiment, the metal protrusion 28 is provided on the inner tube wall of the main waveguide 1.

  Next, the operation will be described. The H-plane T-branch waveguide according to the second embodiment has the same configuration as the H-plane T-branch waveguide according to the first embodiment, and the H-plane T-branch waveguide described in FIG. Impedance matching can be achieved similarly to the example of the reflection characteristics of the wave tube.

  As described above, the H-plane T-branch waveguide of the second embodiment can achieve impedance matching from the input terminal side of the main waveguide with a simple structure.

1 main waveguide, 2 branch waveguide, 3 connection port, 4 connection terminal, 5 input terminal (input / output terminal), 6 first output terminal (first input / output terminal), 7 second output terminal ( (Second input / output terminal), 8 matching metal partition wall, 9 H-plane T branch waveguide, 21 main waveguide, 22 branch waveguide, 23 connection port, 24 connection terminal, 28 metal protrusion, 29 H plane T Branched waveguide.

Claims (3)

A main waveguide having one end as a first terminal and the other end as a connection terminal, and the periphery is composed of a pair of E surfaces and a pair of H surfaces;
The main waveguide has one end as a second terminal and the other end as a third terminal. The periphery is composed of a pair of E surfaces and a pair of H surfaces, and a connection port is formed in a part of one of the H surfaces. And a branch waveguide connected to the connection port,
The main waveguide has a stepped shape in which one of the E surfaces is bent inside the main waveguide around the connection terminal, and the distance between the pair of E surfaces around the connection terminal is An H-plane T-branch waveguide characterized by being narrower than the distance between the pair of E-planes around the first terminal. A main waveguide having one end as a first terminal and the other end as a connection terminal, and the periphery is composed of a pair of E surfaces and a pair of H surfaces;
The main waveguide has one end as a second terminal and the other end as a third terminal. The periphery is composed of a pair of E surfaces and a pair of H surfaces, and a connection port is formed in a part of one of the H surfaces. And a branch waveguide connected to the connection port,
The width of the main waveguide is substantially the same as the width of the E surface of the main waveguide on one E surface of the main waveguide in the periphery of the contact terminal, and the connection port is formed on one side surface. An H-plane T-branch waveguide, wherein a rectangular parallelepiped-shaped metal protrusion that forms a surface continuous with the H-plane is provided. 3. The H-plane T-branch waveguide according to claim 1 or 2, wherein one E-plane of the main waveguide and one E-plane of the branch waveguide are the same plane.

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