JP2001085901A - Waveguide - Google Patents

Abstract

PROBLEM TO BE SOLVED: To freely set input and output directions at low cost even though a cutting direction is restricted by defining one end of a 2nd waveguide whose middle part is connected to one end of a 1st linear waveguide as a short-circuit surface and the other end as an output surface and also inserting a matching element bar. SOLUTION: This waveguide 10 consists of the 1st linear waveguide part 11 and a 2nd linear waveguide 14 which is arranged orthogonally with the part 11 and constitutes a T-junction as a whole. An end of the part 11 which is farther from the part 14 forms an input terminal 12 and has a plane of symmetry 13 that goes through the center of the part 11 and traverses the part 14. One end of the part 14 is closed and forms a short-circuit surface 17, and the other end forms the output terminal 16. A matching element 18 is inserted into the plane 13. Generally, a T-junction equally divides a signal inputted from the terminal 12 and outputs the resultant signals to both ends 16 and 17. However, in the case of the waveguide 10, one end of the T-junction is defined as the surface 17 and the matching element is inserted into the plane 13, and hence an input signal is outputted to the terminal 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveguide, and more particularly, to a waveguide called a bend which changes the traveling direction of an input signal and an output signal.

[0002]

2. Description of the Related Art Waveguides are generally used for microwave transmission. A general waveguide includes, for example, a case 20 formed of a conductive metal in a rectangular block shape as shown in FIG. 3, and a cover 30 of a conductive metal plate fixed to one surface of the case 20 with screws or the like. It consists of.

[0003] On one surface (for example, upper surface) 21 of a case 20, a U-shaped (or U-shaped) groove 2 is formed along its longitudinal direction.
2 are formed. Upper surface 2 of case 20 with such groove 22
By covering 1 with a cover 30, a waveguide having a cavity having a substantially rectangular cross section can be obtained. Such a groove 22 can be obtained relatively easily by processing a metal block constituting the case 20 using a cutting machine.

[0004]

However, an actual waveguide may need to bend not only in the minus direction as shown in FIG. 3 but also in the directions of the input signal and the output signal. Such a bend will be described with reference to FIG. First, the case where the cutting direction is the −Z direction and the cutting is performed only from the − direction will be described.

As shown in FIG. 4A, it is easy to cut the waveguide so that the signal travels in parallel to the XY plane.
Also, as shown in FIG. 4B, a waveguide whose signal changes its path from the XY plane to the Z direction can be cut by using a step bend. Further, as shown in FIG. 4C, a waveguide in which a signal changes its path from the -Z direction to the XY plane and then to the + Z axis direction can be cut by using two step bends.

On the other hand, when cutting is performed in the two-axis direction, as shown in FIG.
Waveguides that change their path in the plane, and in the -Z direction, can be cut using step bends and three-piece construction, one case and two covers. FIG.
Similarly to (D), a waveguide whose signal changes its path from the -Z axis direction to the XY plane and then to the -Z axis direction can be manufactured in a three-part structure including one case, two covers, and two blocks. It is possible.

As shown in FIG. 4D, the conventional bend configuration in which a signal changes its path from the -Z axis direction to the XY plane and then to the -Z axis direction has the following problems.

First, when cutting is performed from the −Z axis direction, FIG.
The bend as shown in (D) cannot be processed. Therefore, -Z
Although machining can be performed by performing cutting from two directions, the axial direction and the + Z axis direction, high machining accuracy is required to maintain the degree of contact between the components. By manufacturing the step portion indicated by hatching in the drawing as a block, each part can be easily manufactured, but there is a problem that it is difficult to obtain the block position and the degree of contact during assembly.

SUMMARY OF THE INVENTION An object of the present invention is to provide a waveguide in which, when a waveguide circuit is formed by cutting, the input and output directions can be freely set at low cost even when the cutting direction is limited. It is.

[0010]

In order to solve the above-mentioned problems, a waveguide according to the present invention employs the following characteristic configuration.

(1) An intermediate portion of a second waveguide portion is connected to the other end of a linear first waveguide portion having an input end formed at one end,
A waveguide in which one end of the second waveguide portion is a short-circuit surface, the other end is an output terminal, and a matching element rod is inserted in a symmetric surface.

(2) The waveguide according to (1), wherein another waveguide is connected to the output end of the second waveguide in an orthogonal relationship to form two T branches.

(3) The waveguide according to the above (2), wherein one end of the another waveguide portion is a short-circuit surface, and the output direction can be selected with respect to the input direction.

(4) A waveguide including a cover having an input end formed thereon, a waveguide having a short-circuited surface at both ends, and a case having an output end communicating with the waveguide.

(5) The waveguide according to (4), wherein the input end and the output end are respectively formed near both ends of the waveguide.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction and operation of a preferred embodiment of a waveguide according to the present invention will be described below in detail with reference to the accompanying drawings.

FIGS. 1A and 1B show a first embodiment of a waveguide according to the present invention. FIG. 1A is a perspective view of the waveguide 10, and FIG. 1B is a plan view. The waveguide 10 includes a linear first waveguide 11 and a second linear waveguide 14 which is orthogonal to the first waveguide and constitutes a T-branch as a whole. Second waveguide section 14 of first waveguide section 11
The far end forms an input end 12. Also, the first waveguide 1
Plane of symmetry 13 passing through the center of 1 and traversing the second waveguide section 14
Having. One end of the second waveguide portion 14 is closed and the short-circuit surface 17 is closed.
, And the other end forms an output end 16. Further, the matching element rod 18 is provided on the above-mentioned symmetry plane 13 of the second waveguide section 14.
Is inserted.

Generally, in the T-branch, a signal input from the input terminal 12, that is, an input signal is equally divided into both ends 16, 17 and output. However, the waveguide 10 shown in FIGS.
In (1), one end of the T-branch is used as a short-circuit plane 17 and a matching element rod 18 is inserted into the symmetry plane 13. Therefore, the input signal input from the input terminal 12 is output to the output terminal 16 and performs the same operation as the bend.

In FIGS. 1A and 1B, although not shown,
As a modified example of the present invention, by providing two T branches, the input direction and the output direction can be the same direction or the opposite directions. That is, the waveguide 10 shown in FIGS.
Another T-branch is connected (connected) to the output end 16 of the same as the waveguide 10. At this time, depending on which of the two ends the short-circuit surface is formed, the output direction can be the same direction as the input direction or the opposite direction.

Next, FIGS. 2A and 2B show a second embodiment of the waveguide according to the present invention. FIG. 2A is a front view of the waveguide 100, and FIG. 2B is a line of FIG. 2A.
It is sectional drawing which follows AA. The waveguide 100 has a two-part configuration in which the input direction, output direction, and cutting direction of a signal are all the same.

That is, the waveguide 100 includes a case 110 and a cover 120 made of conductive metal.
Waveguide 112 is formed in case 110 by cutting, and short-circuit surfaces 114 and 116 are formed at both ends. Furthermore,
The case 110 is provided near the short-circuit surface 116 and the waveguide 11.
An output end 118 communicating with the second end is formed. On the other hand, an input terminal 122 is formed on the cover 120 near the short-circuit surface 114 of the case 110.

In the waveguide 100 shown in FIGS. 2A and 2B, an input signal is transmitted from the input end 122 of the cover 120 through the case 110 and the waveguide 112 formed between the cover 120. The light travels in a direction perpendicular to the input direction, and is output through the output terminal 118 in a direction perpendicular to the input direction, that is, in the same direction as the input direction. Accordingly, the input terminal 122 and the output terminal 118 are offset from each other, but the input direction and the output direction of the signal are the same.

The preferred embodiment of the waveguide according to the present invention has been described above. However, this is merely an example, and it goes without saying that various modifications can be made in accordance with the specific application.

[0024]

As is clear from the above description, the waveguide according to the present invention has the following various effects.

First, it is possible to freely change the input / output direction even when the cutting direction is limited to a specific surface of the waveguide in the cutting process. This is particularly effective when the cutting direction and the input / output direction, which cannot be realized by the step-type bend, are the same (the input direction and the output direction are the same).

Secondly, in the case of the two-part structure of the case and the cover, since cutting can be performed from any surface, there is a degree of freedom in the cutting direction in integrated cutting with another waveguide circuit.

Third, there is no need to use a divided structure, and the structure is simplified, so that it can be manufactured at a low cost.

Fourth, since there is no need for contact between the components in the waveguide and the cover, no special structure is required in terms of the degree of contact.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of a waveguide according to the invention,
(A) is a perspective view, (B) is a top view of (A).

2A and 2B show a second embodiment of a waveguide according to the present invention, wherein FIG. 2A is a front view, and FIG. 2B is a cross-sectional view taken along line AA of FIG.

FIG. 3 is an exploded perspective view of a general waveguide.

FIG. 4 is a configuration diagram of a conventional general bend.

[Explanation of symbols]

 10, 100 Waveguide 11 First waveguide section 14 Second waveguide section 12, 122 Input end 13 Symmetry plane 16, 118 Output end 17, 114, 116 Short circuit plane 18 Matching element rod 110 Case 112 Waveguide 120 cover

Claims (5)

[Claims] An intermediate portion of a second waveguide portion is connected to the other end of a linear first waveguide portion having an input end formed at one end, and one end of the second waveguide portion is short-circuited. A waveguide, wherein the other end is an output end, and a matching element rod is inserted into a symmetric plane. 2. The T-branch according to claim 1, wherein another waveguide section is connected to the output end of the second waveguide section in an orthogonal relationship to form two T branches. Waveguide. 3. The waveguide according to claim 2, wherein one end of said another waveguide portion is a short-circuit surface so that an output direction can be selected with respect to an input direction. 4. A waveguide comprising: a cover having an input end formed therein; a waveguide having a short-circuited surface at both ends; and a case having an output end communicating with the waveguide. 5. The input terminal and the output terminal are formed near both ends of the waveguide, respectively.
The waveguide according to claim 1.