JPH0420002A - Waveguide power combiner - Google Patents

Abstract

PURPOSE:To attain miniaturization and low loss, and to improve the matching with a microwave integrated circuit by integrating a directional coupler and a mode converter via a corner waveguide, dividing the waveguide into two in the middle of the H plane, implanting each to two metallic plates and arranging the assembly symmetrically in terms of a mirror image. CONSTITUTION:A 90 deg. corner is provided to input waveguides 4-7, and directional couplers 1-3 and mode converters are integrated via the corner waveguides, and each waveguide is divided into two in the middle of the H plane and each is implanted to two metallic plates and the assembly is stacked symmetrically in terms of a mirror image. Thus, the direction of a coaxial or strip line input and a waveguide output is arranged. Then the matching performance with the microwave integrated circuit is improved, the waveguide power combiner with small size, low loss and offering ease of use is realized, in which the integrated processing with a case is attained as required.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a waveguide power combiner using a directional coupler, which is designed to be compact and have low loss.

[Conventional technology]

Figure 3 is a cross-sectional view of a conventional waveguide power combiner using a directional coupler. In,
1 to 3 are directional couplers, 4 to 7 are input waveguides, 8 is an output waveguide, and 9 to 11 are non-reflection terminations. Moreover, FIG. 5 shows a cross section taken along the line BB' in FIG. 3. In addition, λg in the figure
indicates the tube wavelength at the center frequency.

Next, the operation in the case of simple two-composition will be explained using FIG.

A microwave signal of equal amplitude is input from the input waveguide 4.5,
If the phase of the signal from the input waveguide 5 is delayed by 90° than the phase of the signal from the input waveguide 4, the signals to the output waveguide 8 are combined in phase with each other, and the non-reflection termination is applied. Since the signals to the output waveguide 9 are combined in opposite phases, all of the combined t magnetic field propagates to the output waveguide 8 and does not propagate to the non-reflection termination 9.

By combining this in n stages in a tournament method, it becomes possible to synthesize 2' (n=1.2. . . ).

What is shown in FIG. 3 above is the case of 4 combinations, in which the combined outputs of the two directional couplers 1 and 3 on the input side are folded back using a 180" corner, and the two directional couplers 1 and 3 are , 3 on the output side, four-way combining is performed without changing the length in the propagation direction.

[Problems to be Solved by the Invention] The conventional waveguide power combiner is configured as described above, and when the waveguide power combiner is used with coaxial input or strip line input, a mode converter is input. Waveguide 4-7
However, in this case, the overall size of the device becomes large, and as shown in FIG. There was a problem in that the degree of freedom of configuration was restricted.

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to obtain a waveguide power combiner that is small in size, has low loss, and is capable of coaxial or strip line input.

[Means to solve the problem]

The waveguide power combiner according to the present invention integrates a directional coupler and a mode converter via a corner waveguide, and also divides the waveguide in half at the center of its H-plane to form two metal sheets. It has a structure in which the plates are drilled mirror-symmetrically and stacked one on top of the other.

[Effect]

According to this invention, the input waveguide is provided with a 90° corner, the directional coupler and the mode converter are integrally configured via the corner waveguide, and the waveguide is divided in half at the center of the H plane. By creating a structure in which two metal plates are dug mirror-symmetrically and overlapped, the directions of the coaxial or strip line input and the waveguide output can be aligned, ensuring compatibility with microwave integrated circuits. It is possible to obtain an easy-to-use waveguide power combiner that is small in size, has low loss, and can be integrated with a housing if necessary.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of a waveguide power combiner according to an embodiment of the present invention, in which the same reference numerals as in FIGS. 3 to 5 indicate the same or corresponding parts, 12 to 15 are coaxial probes, 16 to
19 is an input coaxial line.

Next, the effects will be explained.

As is clear from the figure, the coaxial waveguide converter is formed by bending the input waveguides 4 to 7 using 90° corners and short-circuiting their tips, without increasing the length in the propagation direction. , it is possible to use the present power combiner with a coaxial input. In addition, the coaxial waveguide converter and the waveguide power combiner are integrally formed using the above-mentioned half-split structure, and the current flowing across the cut plane of the half-split in both the waveguide section and the coaxial section is Since there is no contact resistance, the problem of attenuation due to contact resistance does not occur, and power synthesis with low loss is possible.

Next, another embodiment of the present invention is shown in FIG. In the figure,
20 to 23 are MIC substrates, and 24 to 27 are probes formed in patterns on the MIC boards 20 to 23. Further, a cross section taken along line AA' is shown in FIG.

By forming it in this way, it is possible to use a strip line input, and it can be easily applied to a power combining circuit of a high-output solid-state power amplifier using a microwave integrated circuit.

In the above embodiment, each combining circuit is a two-branch directional coupler, but the configuration of the combining circuit used is not limited to this. For example, each combining circuit has a three-branch directional coupler. Of course, it can also be used in the case of a modified circuit such as a coupler.

〔effect〕

As described above, according to the waveguide N1 force combiner according to the present invention, a coaxial or stripline waveguide converter and a directional coupler are integrally configured via a corner waveguide, and two Since it is integrally formed with a half-split structure that is mirror-symmetrically dug into a metal plate and overlapped, it has the advantage of being small, low loss, and good compatibility with microwave integrated circuits.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a waveguide power combiner according to an embodiment of the present invention, FIG. 2 is a sectional view showing a waveguide power combiner according to another embodiment of the invention, FIG. 4 is a sectional view showing a conventional waveguide power combiner, FIG. 5 is a sectional view taken along line BB' in FIG. 3, and FIG. 6 is a sectional view taken along line AA' in FIG. 2. 1-3 are directional couplers, 4-7 are input waveguides, 8 is output waveguides, 9-11 are non-reflection terminations, 12-15 are coaxial probes, 16-19 are input coaxial lines, 20- 23 is MIC
The substrates 24 to 27 are probes. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (3)

[Claims] (1) In a waveguide power combiner consisting of three directional couplers with 4 inputs and 1 output, the four input waveguides of the two directional couplers on the input side are aligned at a predetermined angle. A groove is formed in the vertical direction on the H-plane of the waveguide between the short-circuited end and the corner, and a coaxial waveguide converter is constructed using the probe. A waveguide power combiner characterized by having a structure in which a waveguide converter and a waveguide converter are integrally formed and divided in half at the center of the H plane, and the two metal plates are dug in mirror symmetry and overlapped with each other. . (2) The waveguide power combiner according to claim 1, characterized in that a strip line input is used instead of a coaxial input. (3) The waveguide power combiner according to claim 1, wherein a branch coupler is used as the directional coupler.