JPH03234103A - Microwave power distribution synthesizer - Google Patents

Abstract

PURPOSE:To realize a power distribution synthesizer having a broad band frequency characteristic and a low loss by combining effectively a conical coaxial guide path conversion section and a radial guide path. CONSTITUTION:A 1st coaxial terminal 1 is fitted to a center of a hollow cylinder of a radial guide path 2 comprising thin hollow cylinders being transmission lines between the 1st coaxial terminal 1 and 2nd coaxial terminals 11-18 and the 2nd coaxial terminals 11, 15 are fitted to a position at a prescribed radius from the center. Conical coaxial radial guide path conversion sections 20-28 for impedance matching purpose are provided to the tip of the center conductor of the 1st and 2nd coaxial terminals 1, 11-18. Thus, the microwave distribution synthesizer is realized, in which the circuit loss is small at a broad frequency band.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a microwave power distribution/combiner, and more particularly to a low-loss, broadband microwave power distribution/combiner.

[Conventional technology]

Conventionally, this type of microwave power divider/combiner is a Wilkinson type power divider/combiner or TM. A microwave power distribution combiner using a mode cylindrical cavity resonator is used. Since the Wilkinson type power distribution/combiner is a circuit based on a coaxial circuit, it has a wide band, but it has a large circuit loss and is not suitable for use in a power amplifier or the like that particularly requires low loss characteristics. On the other hand, the latter microwave power distribution combiner using a cylindrical cavity resonator is used as a distributor, as shown in the plan view of Figure 3 and the sectional view of Figure 4 showing the BB cross section of Figure 3. In this case, an electric field coupling probe 30A of the distribution input terminal 30 that inputs microwaves, a TMOIO mode resonator 39 excited by this probe 31A, and a TM with a frequency adjustment screw on the distribution side by a coupling rod 33. The configuration is such that microwaves excited by the mode resonator 40 and distributed from the magnetic field coupling loops 31A and 35A to the distribution output terminals 31 and 35 are taken out. Note that the signals are similarly outputted from the other distribution output terminals 32 to 38. A microwave distributor/combiner using this cavity resonator has low circuit loss, but it has a difficulty in widening the frequency band used, and a power distributor/combiner with two additional stages of 7M mode resonators is also being considered. However, the frequency ratio band is 10%
It was not possible to obtain more than a certain degree of bandwidth.

[Problem to be solved by the invention]

As for the conventional microwave power divider/combiner mentioned above, the Wilkinson type power divider/combiner has a good frequency broadband property, but
There is a lot of loss in the circuit, and a power distribution combiner using a cylindrical cavity resonator with 7M mode resonance has good circuit loss but has a problem with wide frequency band characteristics.Microwave distribution that satisfies both circuit loss and wide frequency band characteristics There was a drawback that a synthesizer could not be obtained.

[Means to solve the problem]

The microwave power distribution combiner of the present invention is a microwave power distribution combiner that inputs (or outputs) a microwave signal from one first coaxial terminal and outputs (or inputs) microwave signals from a plurality of second coaxial terminals. , a radial waveguide forming a transmission path between the first coaxial terminal and the second coaxial terminal with a thin hollow cylindrical part, and the first coaxial terminal located at the center of the circle of the hollow cylindrical part of the radial waveguide. and the second coaxial terminal is attached at a predetermined radius from the center, and a conical coaxial radial conductor is attached to the tips of the center conductors of the first and second coaxial terminals for impedance matching to the radial waveguide. A wave path converter is provided.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a plan view of an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line A-A in FIG. 18 is a distributor output terminal (or combiner input terminal), 2 is a radial waveguide, 2A
3A and 3B are the radial waveguide outer walls, 3A and 3B are the cross-sectional conductor walls of the radial waveguide, and 20 to 28 are conical coaxial waveguide converters.

First, the structure of the microwave power distribution/synthesizer of this embodiment will be explained. The radial waveguide 2 is a hollow, thin cylinder surrounded by a radial waveguide outer wall 2A. The 8-cone-shaped coaxial waveguide converter 20 has the distribution input terminal 1 attached to the center, and when the coaxial center conductor enters the radial waveguide 2, it expands into a conical shape and touches the bottom surface. The eight distributed output terminals 11 to 18 shown are attached with their coaxial centers placed at a distance of 1 from the end conductor walls 3A and 3B on the inner surface of the radial waveguide 2. The conical coaxial waveguide converters 21 to 28 of the eight distribution output terminals have the same structure as the conical coaxial waveguide converter 20.

Next, the operation of the distributor of this embodiment will be explained.
The signal input from the distribution input terminal 1 is converted from coaxial impedance to radial waveguide impedance by the conical coaxial waveguide converting section 20. For example, when the impedance of the coaxial section is 50Ω, the angle θ shown in the figure is about 4
Good conversion characteristics can be obtained by setting the angle to 5° and selecting h to be about 0.2 wavelength of the microwave wavelength. In this way, the signal input from the distribution input terminal 1 is guided into the radial waveguide 2 in the form of radial ripples from the center and spreads out, and some of the ripples are captured by the conical coaxial waveguide converter 25, for example. The signal is then output from the distribution output terminal 15. At this time, a part of the signal passes through the conical conversion part, &=1/
It is reflected by the wavelength end face conductor wall 3A four wavelengths ahead. The distribution input terminal 1 and distribution output terminal 15
If the distance is selected, a distributor with no mismatch from the input terminal to the output terminal can be constructed.Even when used as a 0 combiner, no mismatch will occur since the operation is reversible.

〔Effect of the invention〕

As explained above, in the present invention, by effectively combining a conical coaxial waveguide converter and a radial waveguide, it is possible to realize a power distribution/synthesizer that has broadband frequency characteristics and low loss. There is an effect that can be done. Furthermore, the thin radial waveguide and the conical converting section have the effect of realizing a microwave power distribution/synthesizer that is more compact than the conventional example.

11-18. 31-38... Distribution output terminal (or composite input terminal), 20-28... Conical coaxial waveguide conversion section, 3A, 3B... End face conductor wall of radial waveguide, 3
9...TMo! o mode resonator, 40...TM, a0 mode resonator.

Claims (2)

[Claims] 1. In a microwave power distribution combiner that inputs (or outputs) a microwave signal from one first coaxial terminal and outputs (or inputs) microwave signals from a plurality of second coaxial terminals, the first coaxial terminal and the first coaxial terminal A radial waveguide in which a transmission path between two coaxial terminals is formed by a thin hollow cylindrical part, and the first coaxial terminal is attached to the circular center of the hollow cylindrical part of the radial waveguide, and the first coaxial terminal is attached at a predetermined radius from the center. The second coaxial terminal is attached at a position, and a conical coaxial radial waveguide converting portion for impedance matching to the radial waveguide is provided at the tips of the center conductors of the first and second coaxial terminals. Microwave power distribution combiner. 2. The conical coaxial radial waveguide conversion section attached to the second coaxial terminal is located at a distance of 1/4 wavelength from the side wall of the radial waveguide, and the taper angle of the conical section corresponds to the coaxial impedance. 2. The microwave power distribution combiner according to claim 1, wherein the microwave power distribution combiner has a predetermined angle.