JP3208848B2 - High frequency power distribution and synthesis circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power combining circuit in a high frequency range, and more particularly to a plurality of amplifiers using a parallel coupled line type directional coupler using a distributed constant line such as a microstrip line or a coaxial line. The present invention relates to a power distribution / combination circuit for distributing and combining signals in the case of operating in parallel.

[0002]

2. Description of the Related Art In an amplifier having a high output in a high frequency range, a plurality of amplifiers are arranged in parallel and their outputs are combined. FIG. 4 shows a circuit for operating a conventionally well-known amplifier in parallel. The signal from the input terminal 1 is supplied to the first distributor 2
a, and is divided into two by the second and third distributors 2b and 2c, respectively, for a total of four distributions.
Amplifiers 6a, 6b, 6 connected to 3b, 3c, 3d
c, 6d and the input terminals 7a, 7b, 7c, 7
d, and are combined into one by the combiners 2d, 2e, 2f and output to the terminal 8.

[0003] A parallel line type 3 dB directional coupler using a distributed constant line such as a microstrip line or a coaxial line is often used as a two distribution circuit. FIG. 5 shows a circuit configuration of a parallel line type 3 dB directional coupler. The signal from the input terminal 1 is １ ／ λg (λg: propagation wavelength)
Are distributed to the output terminals 3a and 3b by 1/2 each. The phase difference of the signal from the input terminal 1 to the output terminal 3a is 90 degrees, and the phase difference of the signal from the output terminal 3b is
180 degrees. The remaining terminals have a non-reflection terminal 4
Are provided.

FIG. 6 shows a conventional configuration example of a 1: 4 splitter using the parallel line type 3 dB directional coupler. The signal from the input terminal 1 is split into two by the first splitter 2a, and split into two by the second and third splitters 2b and 2c, respectively, for a total of four splits, and to the output terminals 3a, 3b, 3c and 3d. Is output. The phase difference of the signal from the input terminal 1 to the output terminal due to passing through the two dividers is 270 degrees at 3a and 36 at 3b.
It is 270 degrees at 0 degree and 3c, and 180 degrees at 3d.

[0005]

When a plurality of amplifiers are operated in parallel, in order to improve the synthesizing efficiency, the signal input from the input terminal of the distributor must pass through the plurality of amplifiers and reach the output terminal of the synthesizing circuit. Must have the same phase length. When a parallel coupled line type directional coupler using a distributed constant line such as a microstrip line or a coaxial line is used as a power distribution combiner, if the conventional configuration is used, the phase relationship between the input and output is reduced. The distributor and the synthesizer cannot be the same. For example, using two circuits of FIG.
If one of them is used as a distributor and the other is used as a combiner, the distributor 3a and the combiner 3a are opposed to each other. There are two cases where 3d is opposed, but in either case, the phase length of each passage is not the same. Conventionally, the input-side distributor and the output-side combiner have been used separately with different circuit configurations. For this reason, there has been a problem that the entire configuration is complicated and it is difficult to make the phase lengths of the passages uniform.

[0006] An object of the present invention is to use the same circuit configuration as a pair, the phase length of each path is the same,
An object of the present invention is to realize a power divider / combiner that can be used as both a divider on the input side and a combiner on the output side, thereby simplifying the overall configuration and improving the combining efficiency.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention divides a signal from an input terminal into two signals by a first directional coupler, and then separates the signals into second and third directional couplers. In each, the signal is divided into four signals in total, and a transmission line of a certain length is provided between the output terminal of the first directional coupler and the input terminal of the second or third directional coupler, Either the second or third directional coupler is configured such that the position of the output terminal is reversed left and right.

[0008]

In the case where one of the second and third directional couplers is set so that the position of the output terminal is reversed left and right, if the output terminals are 3a, 3b, 3c and 3d from the left, the input terminal The phase difference of the signal to the output terminal is 270 degrees at 3a, 3b
Is 360 degrees, 3c is 180 + k degrees, and 3d is 270 + k degrees. Here, k is the phase length of the transmission line between the output terminal of the first directional coupler and the input terminal of the second or third directional coupler. The phase length of each passage when 3a and 3d are opposed to each other is 540 + k degrees.

For this reason, according to the configuration of the present invention, a power distribution combiner that can be used as an output combiner is realized by opposing the same structure as the distributor on the input side with the right and left reversed. I can do it.

[0010]

Embodiments of the present invention will be described below in detail. FIG. 1 is an explanatory diagram of an embodiment of a power distribution / combiner according to the present invention.

The signal from the input terminal 1 first enters the first directional coupler 2a and is divided into a passing output that undergoes a 90-degree phase change and a combined output that undergoes a 180-degree phase change. The passing output that has undergone a 90-degree phase change in the first directional coupler 2a passes through the transmission line 5, and the second directional coupling is arranged such that the position of the output terminal is reversed left and right from the normal case. The phase shifter 2b is again divided into a passing output appearing at an output terminal 3c after a phase change of 90 degrees and a combined output appearing at an output terminal 3d receiving a phase change of 180 degrees.
The combined output having undergone a 180-degree phase change in the first directional coupler 2a enters the third directional coupler 2c, where it undergoes a 90-degree phase change and appears at the output end 3a. The output and the combined output appearing at the output end 3b after receiving a phase change of 180 degrees.

In such a configuration, the phase difference between the signal between the input terminal 1 and the output terminal is 270 degrees in 3a, 360 degrees in 3b,
3c is 180 + k degrees, and 3d is 270 + k degrees. Here, k is the phase length of the transmission line provided between the directional couplers 2a and 2b.

FIG. 2 is an explanatory diagram of another embodiment of the power distribution / combiner according to the present invention. The transmission line 5 is provided between the first directional coupler 2a and the third directional coupler 2c, and the position of the output terminal of the third directional coupler 2c is reversed left and right as compared with the normal case. The arrangement is such that With such a configuration, the phase difference between the signal between the input terminal 1 and the output terminal is 360 + k degrees for 3a, 270 + k degrees for 3b, 270 degrees for 3c, and 180 degrees for 3d. In the configuration of FIGS. 1 and 2, the phase length of each passage when 3a and 3d face each other is as follows:
In any case, the angle is 540 + k degrees.

FIG. 3 is an explanatory diagram of another embodiment of the power distribution / combiner according to the present invention. The signal from the input terminal 1 enters the first directional coupler 2 and is divided into a passing output and a combined output. The signals pass through splitters 9 and 10 each having a ratio of 1: 4 and eight output terminals 3a to 3d (× 2). Output from When the configuration shown in FIG. 1 or FIG. 2 is used as the 1: 4 distributors 9 and 10 in this circuit, the phase lengths of the respective paths when the left and right sides are reversed and 3a and 3d face each other are all the same. .

According to the present invention, when one signal is returned to one signal through a plurality of paths, for example, when a plurality of amplifiers are operated in parallel, the same structure as that used as the input side divider is used. Is used as an output-side combiner, and the output terminals of the distributor and the input terminals of the combiner are connected so that the left and right sides are reversed, so that the phase lengths of the plurality of paths are all the same. As a result, it is possible to realize a power divider / combiner in which the same structure can be used for both the input side divider and the output side combiner, and there is no need to separately design and manufacture the divider and the combiner. You only need to prepare two things. Therefore, the configuration can be simplified and the characteristics can be made uniform.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment of a high-frequency power distribution / synthesizer according to the present invention.

FIG. 2 is an explanatory diagram of another embodiment of the high frequency power distribution / synthesizer according to the present invention.

FIG. 3 is an explanatory diagram of another embodiment of the high frequency power distribution / combiner according to the present invention.

FIG. 4 is a system diagram of a conventional power combining type high output amplifier.

FIG. 5 is an explanatory diagram of a parallel line type 3 dB directional coupler.

FIG. 6 is an explanatory diagram of a conventional 1: 4 high-frequency power distribution / combiner using a 3 dB directional coupler.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... input terminal, 2 ... directional coupler, 3 ... output terminal of distributor, 4 ... non-reflection termination, 5 ... transmission line.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01P 5/16 H03F 3/60 H03F 3/68

Claims (3)

(57) [Claims] The present invention uses a plurality of parallel coupled line type directional couplers made of a microstrip line or a coaxial line, and distributes a signal from one input signal terminal to a plurality of output signal terminals or a plurality of output signal terminals. In the high frequency power distribution combining circuit that combines the input signal from the input terminal into one output signal, the output terminal and the main line that are output through one input terminal and the main line directly connected to the input terminal It has first, second, and third directional couplers having two output terminals, and an output terminal that is output through a coupling line that is electromagnetically coupled, and two output terminals of the first directional coupler. The second and third directional couplers are connected to two output terminals, and the position of the output terminal connected to the main line of the second or third directional coupler and the position of the output terminal connected to the coupling line In the second and third directional couplers RF power divider combining circuit, characterized in that arranged as comprising the left and right sides the same to have. 2. An output terminal of the high-frequency power distribution / synthesis circuit according to claim 1, wherein the output terminal is output through one input terminal and a main line directly connected to the input terminal. The configuration of connecting a directional coupler having two output terminals to an output terminal output through a coupling line for electromagnetic coupling is repeated, and 1: 2 n (n: 2, 3, 4, 5,...)
...), the positions of the output terminal from the main line and the output terminal from the coupling line of each of the couplers are the same in the left and right in the second and third directional couplers. A high-frequency power distribution / synthesis circuit characterized in that: 3. A high-frequency amplifier using the high-frequency power distribution / synthesis circuit according to claim 2.