JPH01147903A - High frequency power synthesizer - Google Patents

Abstract

PURPOSE:To adjust the bend characteristic by varying the height of a resonator in a ring shape between a feeding terminal provided on the middle in a single cavity resonator and plural coupling terminals provided the surrounding so as to form a double resonance circuit whose resonance points are two. CONSTITUTION:A radial mode cavity part 3 is formed by metal cavity outer walls 1,2 and a ring recessed part 7 is provided in the cavity 3. The signal to be synthesized is led into the cavity 3 from 6 coaxial input terminals 8 and synthesized and extracted from a center coaxial output terminal 5. The signal from the input terminal provided on the surrounding of the cavity 3 reaches the center output terminal 5 via a radial line and the recessed part 7 is provided in-between to realize the double resonance characteristic forming a discontinuous line part. The width of the recessed part 7 is varied to regulate the band characteristic.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a power combining device in a high frequency region, and more specifically, to a circuit configuration that uses a cavity resonator to combine the outputs of a plurality of amplifiers or oscillators. In particular, the present invention relates to a device suitable for obtaining broadband synthesis characteristics.

[Conventional technology]

Conventional devices are disclosed in Japanese Patent Application Laid-open Nos. 59-139702 and 5
9-139703, a first cavity resonator having a single coupling terminal and a second cavity resonator having a plurality of coupling terminals.
It had a so-called double cavity structure in which two cavity resonators were coupled together.

[Problem that the invention seeks to solve]

In the above conventional technology, two cavity resonators are electromagnetically coupled to each other in order to obtain broadband characteristics, and the structure is complicated and large, and the method for adjusting the degree of coupling between the two cavity resonators is not comparable. There were problems such as being cumbersome.

An object of the present invention is to provide a wideband power synthesizer that has a simple and compact structure and whose band characteristics can be easily adjusted.

[Means for solving problems]

The above object is achieved by changing the height of the resonator in a ring shape between a coupling terminal provided at the center of the single cavity resonator and a plurality of coupling terminals provided at the periphery.

This is achieved by forming a double resonant circuit with two resonance points.

[Operation] FIG. 3 shows an equivalent circuit of the present invention. The coupling terminal provided in the center of the cavity resonator has a load resistance Rc (-generally 50
Ω) and a susceptance component BC, and the degree of coupling is represented by nc of the transformer.

When n coupling terminals are provided at the periphery, each terminal has a load resistance Rs (generally 50Ω) and a susceptance component BS.
n of these are combined, and the degree of connection is represented by ns. The area between the center terminal and the peripheral terminal is considered to be a radial line, and if there is nothing in particular, it can be considered as one continuous line, but there is a section where the height of the cavity resonator is changed in the middle. By providing this, two types of discontinuous lines are connected. Also, a radial line is similarly connected between the frequency section terminal and the wall surface of the cavity resonator.

By providing two types of discontinuous lines between the central terminal and the peripheral terminals, it is possible to provide double resonance characteristics, thereby realizing broadband characteristics.

[Example] The present invention will be explained below with reference to Examples. FIG. 1 is a longitudinal cross-sectional view of a cavity resonant boat-shaped power combiner according to an embodiment, and FIG. 2 is a cross-sectional view (A-A' cross section) thereof, showing the case of six combinations.

In the figure, a radial mode cavity 3 is formed by metal cavity outer walls 1 and 2, and a ring-shaped recess 7 is provided in it. guided further into the cavity.

The signals are synthesized and taken out from the central coaxial output terminal 5. A dielectric 6 is provided to support the center conductor of the input/output terminal, and an adjustment screw 9 is provided to finely adjust the band characteristics.

In the above configuration, signals from the input terminals provided around the cavity reach the central output terminal via the radial line, but by providing a ring-shaped recess between them, a discontinuous line part is created and two It is possible to realize multiple resonance characteristics, and by changing the width of the ring-shaped recess, it is also possible to adjust the band characteristics.

FIG. 4 shows another embodiment, in which a ring-shaped convex portion 10 is provided between the central coupling terminal and the peripheral coupling terminal.

Figure 5 shows the band characteristics when the width of the ring-shaped recess and the insertion length of the adjustment screw are optimized using the configuration shown in Figure 1. By adding this, it exhibits bimodal double resonance characteristics and achieves a significantly wider band.

Although the above explanation was about a power combiner, the exact same thing can also be used as a power divider.

Since this fact is well known, detailed explanation will be omitted.

〔Effect of the invention〕

According to the present invention, the same double resonance characteristics as having two cavity resonators can be achieved by partially changing the dimensions of the cavity, so the structure is simple and compact.

This is extremely effective in widening the power synthesis characteristics in high frequency bands.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a cavity resonant boat-shaped power combiner according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A' in FIG. 1, and FIG. FIG. 4 is a vertical sectional view of another embodiment of the present invention, and FIG. 5 is a band characteristic diagram of the synthesizer obtained in FIG. 1. 1...Cavity outer wall 1.2...Cavity outer wall u, 3...Cavity part. 4... Coaxial outer conductor, 5... Output terminal, 6... Dielectric, 7... Ring-shaped recess, 8... Input terminal, 9...
-Adjustment screw, 10...Ring-shaped protrusion. Figure 1 q Figure 2 Graduation 3C21 Figure 4 5I21 T@Omoteaki-Chi

Claims (1)

[Claims] 1. In the cavity coupled power combining circuit having a cavity resonator, one coupling terminal coupled to the central part of the cavity resonator by an electromagnetic field, and a plurality of coupling terminals symmetrically provided in the peripheral part, the above-mentioned A high-frequency power synthesizer characterized in that a part between a central terminal and a peripheral terminal has a ring-shaped cavity resonator whose height is changed.