JP2001168656A - Microwave amplifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the problems on the decrease of the gain and output power of a microwave amplifier and father the generation of oscillation caused by the unbalanced operation of a transistor cell because amplitude deviation and phase deviation occur in an electromagnetic wave distributed to each transistor cell when a microwave is transmitted through the bent part of a wave-guide. SOLUTION: This amplifier is provided with N-stage Wilkinson distributors connected in a tournament shape, the transistor cells 1 which respectively perform power amplification of power distributed by the distributors 2 and which are parallelly arranged, matching circuits 8 for establishing matching between the distributors 2 and the cells 1, and synthetic output circuits 9 which synthesize and output the outputs of each of the cells 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave amplifier using a plurality of identical transistor cells.

[0002]

2. Description of the Related Art In a microwave power amplifier using a plurality of identical transistor cells, an impedance transformer and a T-shaped branch line which also serves as a distribution and synthesis circuit have been used for power distribution and synthesis. Was.

FIG. 5 is a circuit diagram of a conventional microwave power amplifier in the IEICE Technical Report, MW96-142, "FET-cell division matched Ku-band high-output HFET amplifier". In the figure, 40 and 41 are the same transistor cells, 42 is an input terminal of an amplifier, 43 is a T-shaped branch circuit made of a microstrip line, and 44 is a bent portion also made of a microstrip line. Note that the output side of the transistor cells 40, 41 is also T
A similar circuit such as a mold branching circuit 43, a bent portion 44 and an output terminal 45 is connected, and a plurality of transistor cells 4 are connected.
A microwave power amplifier that combines output powers from 0 and 41 is configured.

[0004]

Since the conventional microwave amplifier is configured as described above, when the T-type branch circuit 43 is connected after passing through the bent portion 44 of the line, the line is bent at the bent portion 44. When the distance between the bent portion 44 and the branch point P of the T-type branch circuit 43 is short, a transistor cell via the T-type branch circuit 43 is generated. An amplitude deviation and a phase deviation occur in the electromagnetic waves distributed to 40, 41. Therefore, when a similar circuit is used also on the output side of the transistor cells 40 and 41, a distribution loss and a combined loss occur, thereby lowering the gain and output power of the power amplifier, and further causing unbalanced operation of the transistor cells 40 and 41. There is a problem that oscillation caused by this occurs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and includes an amplitude deviation between distributed powers distributed to respective transistor cells, and a synthesized power which is amplified and synthesized by the respective transistor cells. It is an object of the present invention to obtain a microwave amplifier that can suppress the phase deviation to suppress a decrease in gain and output power and an oscillation caused by an unbalanced operation of a transistor cell, and that can easily be adjusted.

[0006]

A microwave amplifier according to the present invention distributes an input microwave power of 2 ^N (N is a natural number) and is connected to an N-stage Wilkinson distributor connected in a tournament manner. identical transistor cells arranged in parallel number 2 ^N of each power amplifying said 2 ^N distributed distributed power by Wilkinson divider, disposed between said Wilkinson divider and the parallel arranged each transistor cell A matching circuit for establishing matching between the Wilkinson distributor and each of the transistor cells, and a combined output circuit for combining and outputting the divided power amplified by each of the transistor cells. It is.

The microwave amplifier according to the present invention comprises an N-stage Wilkinson distributor connected in a tournament form, which synthesizes and outputs the distributed power amplified by each of 2 ^N transistor cells arranged in parallel. A combiner that uses an inverted output, and a matching circuit on the output side that is arranged between each of the transistor cells and the combiner and that establishes a match between each of the transistor cells and the combiner. Is provided in the composite output circuit.

In the microwave amplifier according to the present invention, the Wilkinson distributor and the matching circuit are formed on different substrates.

In the microwave amplifier according to the present invention, the combiner and the matching circuit on the output side are respectively formed on different substrates.

The microwave amplifier according to the present invention suppresses the phase deviation between the microwaves propagating through each branch of the T-type branch circuit by providing a difference in the length of the two branches of the T-type branch circuit. And an amplitude for suppressing an amplitude deviation between microwaves propagating through the branch of the T-type branch circuit by connecting an open-end stub to only one side of the branch of the T-type branch circuit. And a deviation suppressing means.

In the microwave amplifier according to the present invention, the difference between the lengths of the two branches of the T-type branch circuit on the power distribution side to each transistor cell is provided, so that the microwave distribution propagating through each branch is provided. A phase deviation suppressing means for suppressing a phase deviation between components, and an open-end stub connected to only one side of a branch of a T-type branch circuit on the power distribution side to each of the transistor cells, whereby the T-type branch is connected. An amplitude deviation suppressing means for suppressing an amplitude deviation between microwave distribution components distributed by a circuit and propagating through the branching branch.

In the microwave amplifier according to the present invention, a difference is provided in the lengths of the two branches of the T-type branch circuit on the power combining side that combines the power of the microwaves amplified by the respective transistor cells. Phase deviation suppressing means for suppressing a phase deviation between microwave components propagating through each branch,
By connecting an open-end stub to only one side of a branch of a T-type branch circuit on the power combining side that performs power combining of microwaves power-amplified in each of the transistor cells,
And an amplitude deviation suppressing means for suppressing an amplitude deviation between microwave components which are power-combined by the type branch circuit.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a circuit diagram showing the configuration of a microwave amplifier according to the first embodiment. In the figure, reference numeral 1 denotes a number of 2 ^N (N is a natural number), transistor cells having the same characteristics arranged in parallel, and 2 Wilkinson divider constituted by N-stage tournament-connected microstrip line lines, 3 is a dielectric substrate on which the Wilkinson divider 2 is mounted, 4 is a dielectric substrate including a matching circuit 8, 5 is an input of the amplifier. Terminals, 6 are isolation resistors constituting a Wilkinson distributor, and 7 is a bonding wire connecting between the substrates. It is assumed that the bias voltage to the transistor cell 1 is supplied from the outside in FIG.

The output side of each transistor cell 1
Is a combination of the output of each transistor cell 1 and the output.
A generation output circuit is provided. This composite output circuit
Number 2 ^N Out of each of the transistor cells 1 arranged in parallel.
Combine and output force, connected in N-stage tournament
The input and output of the Wilkinson distributor 2
The synthesizer (synthesis output circuit) 20 used and each of the transistors
It is arranged between the stacell 1 and the synthesizer 20, and
Check the matching between the transistor cell 1 and the combiner 20.
Output side matching circuit (combined output circuit) 9
Have.

The matching circuit 9 on the output side of each of the transistor cells 1 and the combiner 20 are provided on different dielectric substrates, similarly to the Wilkinson distributor 2 and the matching circuit 8 on the input side of the transistor cell 1. Is configured.

In FIG. 1, 9 is a matching circuit on the output side, 10 is a dielectric substrate on which the matching circuit 9 on the output side is formed, and 11 is a combiner 20 for combining and outputting the output of each transistor cell 1. Is a dielectric substrate configured.

Next, the operation will be described. The high frequency power incident from the input terminal 5 is distributed by the Wilkinson distributor 2 composed of microstrip lines and connected in an N-stage tournament form to 2 ^N. Wilkinson divider 2, after the high-frequency power is branched entered from the input terminal 5, line length lambda / 4: between branches at a position of (lambda wave wavelength of the input microwave power), 2 1 ^{/ 2} Z ₀
(Z ₀ is the characteristic impedance of the microstrip line constituting the input end of the Wilkinson distributor 2)
And the characteristic impedance of the microstrip line after that is returned to Z ₀ , so that the microwave power supplied from the input end side without reflection from the input is returned. Microwave power (reflected wave from the transistor cell 1) input from the output end side is distributed to each branch by 1/2.
Is absorbed by the isolation resistor 6 and does not affect other transistor cells. In the Wilkinson distributor 2, since such an isolation resistor 6 is connected between the distribution branches, when an amplitude deviation and a phase deviation occur between the distribution terminals, the isolation component is used for the deviation component. 6 is absorbed as a load, the amplitude deviation and the phase deviation at the time of distribution are suppressed, and the high-frequency power distributed between the distribution terminals has the same amplitude and the same phase. After suppressing the amplitude deviation and phase deviation during distribution in this way,
Impedance matching with the transistor cell 1 is performed by a matching circuit 8 formed on a separate substrate 4.

Each transistor cell 1 power-amplifies and outputs the high-frequency power 2 ^N distributed by the Wilkinson distributor 2, and the input side of the transistor cell 1 is matched by the matching circuit 8 and the output of the transistor cell 1 is output. The output side is matched by the output-side matching circuit 9, so that a high gain with little loss can be obtained. The output from the transistor cell 1 has an amplitude deviation and a phase deviation between the outputs of the transistor cells 1 by the combiner 20 using the input and output of the Wilkinson distributor 2 connected in an N-stage tournament in an inverted manner. When this occurs, the amplitude deviation and the phase deviation are suppressed and synthesized and output.

As a result, amplitude deviation and phase deviation during distribution and synthesis are suppressed, good matching can be established on the input side and output side of each transistor cell 1, and a decrease in gain and output power can be prevented. Oscillation caused by unbalanced operation of the transistor cell can be suppressed.

As described above, according to the first embodiment, after the equal amplitude and the same phase are distributed by the Wilkinson distributor 2, the matching with the transistor cell 1 is performed by the matching circuit 8, and the output side of the transistor cell 1 is output. In the above, after matching was performed by the matching circuit 9 on the output side, the amplitude deviation and the phase deviation were suppressed by the synthesizer 20 using the input and output of the Wilkinson distributor 2 connected in an N-stage tournament inverted. Since the outputs of the transistor cells 1 are combined in this state, oscillation due to unequal distribution and combination can be suppressed, gain and output power can be prevented from decreasing, and a microwave amplifier that operates stably can be obtained.

The Wilkinson distributor 2 is provided on the dielectric substrate 3, the matching circuit 8 is provided on the dielectric substrate 4, the output matching circuit 9 is provided on the dielectric substrate 10, and the combiner 20 is provided on the dielectric substrate 3. 11, it is possible to remove only the substrate on which the matching circuit 8 and the output-side matching circuit 9 are formed, and perform the adjustment work after circuit assembly.
There is an effect that a microwave amplifier that can be easily adjusted is obtained.

Embodiment 2 FIG. FIG. 2 is a circuit diagram showing the configuration of the microwave amplifier according to the second embodiment. In the figure, reference numeral 12 denotes a transistor cell having the same characteristics;
13 is a T-shaped branch circuit composed of a microstrip line on the power distribution side to each transistor cell 12, and 14 is a bent portion of the line. 15 and 16 are T-type branch circuits 13
Are different in length (phase deviation suppressing means), and the lengths of the two branches 15, 16 of the T-type branch circuit 13 on the power distribution side to each transistor cell 12 are different (in this case, For the purpose of suppressing the phase deviation between the microwave distribution components propagating through each branch, the branch 16 is replaced with the branch 15.
Longer). Reference numeral 17 denotes an open-end stub (amplitude deviation suppressing means) connected only to the branch 16, and in this case, the branch 1 of the T-type branch circuit 13.
It is connected only to the branch 16 for the purpose of suppressing the amplitude deviation between the microwave distribution components propagating through the channels 5 and 16. 18
Is the input terminal of the amplifier.

Reference numeral 21 denotes a T-shaped branch circuit composed of a microstrip line on the power combining side which is the output side of each transistor cell 12, and reference numeral 22 denotes a bent portion of the line. 23
And 24 denote two branch branches (phase deviation suppressing means) of the T-type branch circuit 21 having different lengths, and the two branch branches 2 of the T-type branch circuit 21 on the power combining side of each transistor cell 12.
A difference is provided between the lengths of the branches 3 and 24 (in this case, the branch 24 is longer than the branch 23 for the purpose of suppressing a phase deviation between the microwave distribution components propagating through the respective branches). Reference numeral 25 denotes an open-end stub (amplitude deviation suppressing means) connected only to the branch branch 24. In this case, the amplitude deviation between the microwave distribution components propagating through the branch branches 23 and 24 of the T-shaped branch circuit 21 is determined. It is connected only to the branch 24 for the purpose of suppressing. 26 is an output terminal of the amplifier.

Next, the operation will be described. Input terminal 1
When the distance between the bent portion 14 and the distribution point P of the T-shaped branch circuit 13 is short, the microwaves incident from the line 8 are distributed to the branch branches 15 and 16 via the bent portion 14 of the line, so that the microwaves are distributed. An amplitude deviation and a phase deviation occur in the wave distribution component. At this time, by making the lengths of the branching branches 15 and 16 different, mainly the phase deviation generated between the microwave distribution components is suppressed, and the phase deviation of both the distribution components is made as small as possible.

In this case, when the microwave is distributed to the branching branches 15 and 16 via the bent portion 14 of the line, the phase deviation generated in the distribution component is equal to the bent portion as shown in FIG. In the case of a circuit configuration, the phase of the microwave distribution component distributed from port 1 to port 2 lags behind the phase of the microwave distribution component distributed from port 1 to port 3, so that this phase deviation is determined by a T-type branch circuit. The length of the branch is adjusted by changing the length of the branch to make it as small as possible. That is, in the configuration shown in FIG. 3, the lengths of the branch branches of the T-type branch circuit are equal to each other, but by increasing the length of the left branch branch, the micros distributed from port 1 to port 3 is increased. By delaying the phase of the wave power, the deviation between the phase of the microwave distribution component distributed from port 1 to port 2 and the phase of the microwave distribution component distributed from port 1 to port 3 is made as small as possible.

Also, by providing an open end stub 17 at one side of the branch branches 15 and 16 shown in FIG. 2, in this case, at an offset position of the branch branch 16, it mainly occurs between the microwave distribution components. The amplitude deviation is suppressed, and the amplitudes of both the distribution components are made equal.

In this case, the open-end stub 17 serves as a capacitor added in parallel to the microstrip line forming the branch 16 when the microstrip line side of the branch 16 is viewed from a point P in the figure. Acts to reduce the impedance of. As a result,
Microwaves pass through the bent part 14 of the line, branch branches 15,
The amplitude deviation generated in the microwave distribution component by being distributed to the port 16 is the distribution of the microwave distributed from the port 1 to the port 2 in the case of the configuration including the bent portion and the T-shaped branch circuit as shown in FIG. Since the amplitude of the component is larger than the amplitude of the microwave distribution component distributed from the port 1 to the port 3, this amplitude deviation is adjusted by forming an open-end stub 17 on the branch 16 of the T-type branch circuit. Make it as small as possible. That is, in order to increase the amplitude of the microwave power distributed from port 1 to port 3 in the configuration shown in FIG. 3, an open-end stub is provided on the branch through which microwave power distributed from port 1 to port 3 passes. To reduce the impedance on the side of the branch,
The amplitude of the microwave power distributed from port 1 to port 3 is increased, and the deviation between the amplitude of microwave power distributed from port 1 to port 2 and the amplitude of microwave power distributed from port 1 to port 3 is increased. Make it as small as possible. As a result, amplitude deviation and phase deviation at the time of distribution by the T-type branch circuit 13 can be suppressed, and distribution loss can be reduced.

On the output side of the transistor cell 12, when the output between the transistor cells 12 has an amplitude deviation, a phase deviation, and an amplitude deviation due to, for example, variations in the characteristics of the transistor cell 12, the T-type branch circuit 13 In the same manner as described above, the lengths of the branch branches 23 and 24 may be different, and the open-end stub 25 may be provided at an offset position in one of the branch branches 23 and 24. As a result, even on the output side of the transistor cell 12, the amplitude deviation at the time of synthesis by the T-type branch circuit 21,
It is possible to suppress the phase deviation and reduce the combined loss.

Also, a configuration is adopted in which the length of the branch of the T-type branch circuit is different on the input side of the transistor cell 12, and a configuration in which an open end stub is provided at an offset position on one of the branches. In the case where the suppression of the amplitude deviation and the phase deviation is not sufficient, the output side of the transistor cell 12 has a difference in the length of the branch of such a T-type branch circuit. A configuration in which an open-end stub is provided at an offset position is employed, and the amplitude deviation and the phase deviation on the input side of the transistor cell 12 and the amplitude deviation and the phase deviation on the output side of the transistor cell 12 are suppressed. Prevention of a decrease in gain and output power as a microwave amplifier,
Operational stability can be realized.

In FIG. 2, a configuration for suppressing an amplitude deviation and a phase deviation due to distribution of the input of each transistor cell 12 by a T-type branch circuit 13 and an output of each transistor cell 12 by a T-type branch circuit 21 are shown. Although the configuration for suppressing the amplitude deviation and the phase deviation at the time of combining is shown, as shown by the broken line in FIG. 2, for example, when there is another pair of transistor cells 12, the input side terminal 18 of the amplifier is configured. If there is an amplitude deviation and a phase deviation between the branch branches, the length of one branch branch of the T-type branch circuit (indicated by reference numeral 27) having the branch branch constituting the input terminal 18 is set to the other. And a configuration in which one of the branches is provided with an open-end stub (indicated by reference numeral 28 as an example).

Further, even when there is an amplitude deviation and a phase deviation between the branches forming the output terminal 26 of the amplifier, a T-type branch circuit having a branch forming the output terminal 26 (reference numeral 29). ) Can be adopted such that the length of one branch is longer than that of the other branch, and that one end of the branch is provided with an open-end stub (indicated by reference numeral 30 as an example).

Next, the effect of suppressing the amplitude deviation and the phase deviation between the distributed components according to the second embodiment will be described with reference to a specific calculation example. 3 and 4 show microstrip lines formed on a dielectric substrate. FIG. 3 shows a conventional T-shaped branch circuit, and FIG. 4 shows a T-type branch circuit according to the second embodiment.
It is a type branch circuit. When the S parameters of these T-type branch circuits are calculated by electromagnetic field analysis using the moment method, first, in the T-type branch circuit of FIG. 3, S21 (S parameter between port 1 and port 2) at a frequency of 16 GHz =
0.697 ° −128 °, S31 (S parameter between port 1 and port 3) = 0.646 ° −119 °, resulting in an amplitude deviation of 0.66 dB and a phase deviation of 9 °.
On the other hand, in the case of the T-type branch circuit according to the second embodiment shown in FIG. 4, S21 = 0.658∠−128 °, S31 = 0.
661∠-126 °, and the amplitude deviation is 0.04 dB,
Since the phase deviation is 2 °, it is understood that the T-type branch circuit according to the second embodiment can suppress the amplitude deviation and the phase deviation at the time of distribution.

As described above, according to the second embodiment, the length of the distribution branch of the T-type branch circuit is made different, and the stub having an open end is provided at an offset position of one of the branch branches. Thus, an amplitude deviation and a phase deviation generated at the time of distribution can be suppressed, and there is an effect that a microwave amplifier capable of suppressing unnecessary oscillation due to a reduction in amplifier gain and output power and unbalanced operation of a transistor cell can be obtained.

[0034]

As described above, according to the present invention, the Wilkinson distributors connected in an N-stage tournament and the same parallel-arranged power amplifiers respectively amplify the distribution power distributed by the Wilkinson distributors. A matching circuit arranged between the Wilkinson divider and each of the transistor cells for establishing a match between the Wilkinson divider and each of the transistor cells; and a power supply in each of the transistor cells. And a combined output circuit for combining and outputting the amplified distributed power, so that the amplitude deviation and the phase deviation between the distributed powers supplied to the respective transistor cells are suppressed, and the gain and the output power are reduced. And the effect of suppressing oscillation caused by unequal distribution of distribution power supplied to each of the transistor cells.

A microwave amplifier according to the present invention is arranged between a combiner using inverted input and output of a Wilkinson distributor connected in an N-stage tournament and each transistor cell and the combiner. Since the combined output circuit is configured to include a matching circuit on the output side for establishing a match between each of the transistor cells and the combiner, each of the combined signals is combined on the output side of each of the transistor cells. The amplitude deviation and the phase deviation in the output of the transistor cell are suppressed, and there is an effect that a decrease in gain and output power can be suppressed.

In the microwave amplifier according to the present invention, the Wilkinson distributor and the matching circuit are formed on different substrates, respectively, so that the adjustment can be performed with the substrate on which the matching circuit is formed removed. This has the effect of facilitating adjustment work.

In the microwave amplifier according to the present invention, since the combiner and the matching circuit on the output side are respectively formed on different substrates, adjustment is possible with the substrate on which the matching circuit on the output side is removed. For example, there is an effect that the adjustment work becomes easy.

The microwave amplifier according to the present invention suppresses the phase deviation between the microwaves propagating through each branch of the T-type branch circuit by providing a difference in the length of the two branches of the T-type branch circuit. And an amplitude for suppressing an amplitude deviation between microwaves propagating through the branch of the T-type branch circuit by connecting an open-end stub to only one side of the branch of the T-type branch circuit. And a deviation suppression means, so that an amplitude deviation and a phase deviation between microwave powers propagating through each branch of the T-type branch circuit can be suppressed, a decrease in gain and output power, and a reduction in each transistor cell. There is an effect that the oscillation caused by the unbalanced operation can be suppressed.

Since the microwave amplifier according to the present invention is provided with the amplitude deviation suppressing means and the phase deviation suppressing means on the power distribution side to each transistor cell, the T-type on the input side of each transistor cell is provided. It is possible to suppress the amplitude deviation and the phase deviation between the microwave powers propagating through each branch of the branch circuit, and to reduce the gain and the output power and to suppress the oscillation caused by the unbalanced operation of each transistor cell.

Since the microwave amplifier according to the present invention is provided with the amplitude deviation suppressing means and the phase deviation suppressing means on the power combining side of each transistor cell, the T-type branch on the power combining side of each transistor cell is provided. It is possible to suppress the amplitude deviation and the phase deviation between the microwave powers amplified by the respective transistor cells, which propagate through the respective branches of the circuit, and to suppress the decrease in the gain and output power of the microwave amplifier.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a configuration of a microwave amplifier according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a configuration of a microwave amplifier according to a second embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a specific example of a microwave amplifier using a conventional T-type branch circuit, in which dimensions are entered.

FIG. 4 is an explanatory diagram illustrating a microwave amplifier using a T-type branch circuit according to a second embodiment of the present invention as a specific example in which dimensions are entered;

FIG. 5 is a circuit diagram showing a configuration of a conventional microwave power amplifier.

[Explanation of symbols]

1,12 transistor cell, 2 Wilkinson distributor, 3,4,10,11 dielectric substrate, 8 matching circuit,
9. Matching circuit on output side (combined output circuit), 13, 21
T-type branch circuits, 15, 16, 23, 24 Branch branches having different lengths (phase deviation suppressing means), 17, 25 open-end stubs (amplitude deviation suppressing means), 20 combiners (combining output circuits).

Continued on the front page (72) Inventor Yasuyuki Ito 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation (72) Inventor Makoto Matsunaga 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Co., Ltd. F-term in the company (reference)

Claims (7)

[Claims] 1. A input microwave power 2 ^N (N is a natural number) distributing a Wilkinson divider, which is connected to a tournament-like N-stage, the distribution power that is the 2 ^N distributed by the Wilkinson divider The same transistor cells each having a power amplification number of 2 ^N and arranged in parallel, are arranged between the Wilkinson divider and each of the transistor cells arranged in parallel, and are arranged between the Wilkinson divider and each of the transistor cells. A microwave amplifier comprising: a matching circuit for establishing the above-mentioned matching; and a combined output circuit for combining and outputting the divided power amplified by the respective transistor cells. 2. A combined output circuit comprising: an input and output of a Wilkinson distributor connected in an N-stage tournament for combining and outputting distributed power amplified by each of 2 ^N transistor cells arranged in parallel; A combiner used in reverse, and an output-side matching circuit arranged between each of the transistor cells and the combiner for establishing a match between each of the transistor cells and the combiner. 2. The microwave amplifier according to claim 1, wherein: 3. The microwave amplifier according to claim 1, wherein the Wilkinson divider and the matching circuit are respectively formed on different substrates. 4. The microwave amplifier according to claim 3, wherein the combiner and the matching circuit on the output side are respectively formed on different substrates. 5. A power amplifier in which a plurality of identical transistor cells are arranged in parallel and power is distributed to each transistor cell using a T-type branch circuit composed of a microstrip line or power is combined, Phase deviation suppressing means for suppressing a phase deviation between microwaves propagating through each branch of the T-type branch circuit by providing a difference in the length of two branch branches of the circuit; and a branch of the T-type branch circuit An amplitude deviation suppressing means for suppressing an amplitude deviation between microwaves propagating through the branch of the T-type branch circuit by connecting an open-end stub to only one side of the microwave. amplifier. 6. The phase deviation suppressing means includes a T-type branch circuit on the power distribution side to each transistor cell.
By providing a difference between the lengths of the two branch branches, the phase deviation between the microwave distribution components propagating through the respective branch branches is suppressed, and the amplitude deviation suppressing means is a T-type on the power distribution side to the respective transistor cells. By connecting an open-end stub to only one side of the branch of the branch circuit, an amplitude deviation between microwave distribution components distributed by the T-type branch circuit and propagated through the branch is suppressed. The microwave amplifier according to claim 5. 7. The phase deviation suppressing means, wherein a difference is provided in the length of two branch branches of a T-type branch circuit on the power combining side that performs power combining of microwaves power-amplified in each transistor cell, The phase deviation between the microwave components propagating through each branch is suppressed, and the amplitude deviation suppressing means is a branch of a T-type branch circuit on the power combining side that performs power combining of the microwaves power-amplified in each of the transistor cells. By connecting an open-end stub to only one side of
7. The microwave amplifier according to claim 5, wherein an amplitude deviation between microwave components that are power-combined by the type branch circuit is suppressed.