JPH066117A - Impedance transformation type high frequency power combiner - Google Patents

Abstract

PURPOSE:To make the impedance transformation type power combiner small in size. CONSTITUTION:A slit 7 dividing the input side into two input terminals is arranged along a center axis to a signal input side of a 1/4 wavelength impedance transformer 3a arranged in a chassis being a ground conductor, and the 1/4 wavelength impedance transformer 3a is fixed to each input terminal 5 by screw fastening through connection line conductor 4a and fixed to an output terminal 6. Thus, the 1/4 wavelength impedance transformer is used in common with a 1/2 wavelength transmission line, the plane area of the transmission line is made remarkably small and the size of the impedance transformation type power combiner is made small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impedance-modifying high-frequency power combiner, and more particularly, as an electric power combiner used for a television broadcaster, an impedance changer used for parallel combining a large power amplifier of several Kw. A molded high frequency power combiner.

[0002]

2. Description of the Related Art When a conventional high-frequency impedance synthesizer of this type is constructed of a microstrip line, as shown in FIG. 2, a quarter-wavelength impedance transformation is performed inside a chassis 1 as a ground conductor. Units 2 and 3,
One end of these impedance transformers and two input terminals 5
Connection line 4 with an impedance of 50Ω for connecting to
And are formed on the same plane.

In general, the electrical length from the tip of the input terminal 5 to the input signal combining point 9 is one half the operating frequency.

This is because, in a power amplification section in which a plurality of power amplifiers are directly connected to the two input terminals 5 of this impedance transformation type power combiner and a plurality of units are operated in parallel, an arbitrary power amplifier may fail or other reasons may occur. Even if the input terminal is removed and the input terminal is left open, consideration should be given to minimizing the sneak current to other normally operating power amplifiers and the reflected power due to mismatch due to the effect of the open line. Done

[0005]

In this conventional impedance transformation high frequency power combiner, the connecting line interposed from the input terminal to the impedance transformer is on the same plane as the impedance transformer and the input signal combining point from the input terminal. Since the electrical lengths up to 1 are connected by a half wavelength, the plane area occupied by the transmission line becomes large, and there is a problem that the size is inevitable.

The object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide an impedance modification high frequency power combiner capable of suppressing the size increase of the shape by compressing the plane area occupied by the transmission line.

[0007]

SUMMARY OF THE INVENTION An impedance transformation high frequency power combiner of the present invention is a chassis as a ground conductor, at least two input terminals and one output terminal attachable to the chassis, and at least two of the above. Impedance modification having a connection line conductor coupled to each of the input terminals and a quarter wavelength impedance transformer formed on the same plane as the connection line conductor as an integrated structure and having one end connected to the output terminal In a high frequency power combiner, an integrated structure including the connection line conductor and the quarter wavelength impedance transformer is divided into two along the central axis of the input side between the input terminals, and an input signal is input from the input terminals. Has a configuration in which the electric length up to the combining point is set to one-half wavelength of the operating frequency.

In the impedance transformation high frequency power combiner of the present invention, the connection line conductor and the quarter wavelength impedance transformer are formed as microstrip transmission lines on the same plane by processing the conductors. Have a configuration.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a vertical cross-sectional view (A) and a perspective view (B) showing the internal structure of an impedance modification type high frequency power combiner according to an embodiment of the present invention.

The embodiment shown in FIG. 1 has a chassis 1, quarter-wavelength impedance transformers 2 and 3a provided in the chassis 1, a connecting line conductor 4a, two input terminals 5 and an output terminal 6. .

The chassis 1 as a ground conductor serves as a ground portion of the transmission line, and has two input terminals 5 and two output terminals 6 mounted on both ends in the longitudinal direction.

Both ends of the microstrip line including the connecting line conductor 4a and the quarter-wavelength impedance transformers 2 and 3a are bent in an L shape, and the input / output terminals 5 and 6 are formed.
Fastened with screws.

Along the central axis of the quarter-wavelength impedance transformer 3a, a slit 7 having a width of several millimeters is cut from the input terminal 5 to the branch point 8 so that the electric length becomes a half wavelength of the operating frequency. It is embedded.

By arranging the slit 7 to share the quarter impedance transformer 3a and the half wavelength transmission line, the area occupied by the transmission line can be significantly reduced.

[0016]

As described above, according to the present invention, the quarter wavelength impedance transformer and the half impedance transformer are divided into two by providing the slit on the input side of the quarter impedance transformer in the output direction. The wavelength transmission line can be used in common, the plane area of the transmission line can be significantly reduced, and the impedance modification high-frequency power combiner can be significantly downsized.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view (A) and a perspective view (B) showing an internal configuration of an impedance modification type power combiner according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view (A) and a perspective view (B) showing an internal configuration of a conventional impedance transformation power combiner.

[Explanation of symbols]

 1 chassis 2 quarter wavelength impedance transformer 3,3a quarter wavelength impedance transformer 4,4a connection line conductor 5 input terminal 6 output terminal 7 slit 8 branch point 9 input signal synthesis point

Claims (2)

[Claims] 1. A chassis as a ground conductor, at least two input terminals and one output terminal attachable to the chassis, a connection line conductor coupled to each of the at least two input terminals, and the connection line conductor. And an impedance transformation high frequency power combiner formed on the same plane as an integrated structure and having a quarter wavelength impedance transformer whose one end is connected to the output terminal,
The integrated structure including the connection line conductor and the quarter-wavelength impedance transformer is divided into two along the central axis on the input side between the input terminals, and the electric power from the input terminal to the composite point of the input signal is divided. An impedance-modifying high-frequency power combiner whose length is half the operating frequency. 2. The connection line conductor and the quarter wavelength impedance transformer are formed as a microstrip transmission line on the same plane by processing the conductor. Impedance modification high frequency power combiner described.