JPH0559902U - Phase adjustment circuit - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] Two short stubs are used for 1/4 of the frequency.
A circuit is miniaturized in the case of connecting multiple stages of circuits for finely adjusting the phase, which are provided with a wavelength distance provided therebetween. [Structure] Two short stubs are 1/4 of the used frequency
One short stub 7 of the pair of short stubs 7 and 9 in the next stage that obtains different phase amount changes is provided between the two short stubs 3 and 5 of the phase adjusting circuit that are provided with a distance of the wavelength.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a microwave signal phase adjustment circuit used when finely adjusting the phase of a microwave signal.

[0002]

[Prior Art]

 FIG. 2 is a diagram showing a conventional phase adjustment circuit, in which 1 is a main line, 2 is a first FET in which a drain is connected to the main line 1, and 3 is a vertical FET of the main line 1 and a first FET 2 The first short stub 4 connected to the source is a second FET 5 whose drain is connected to the main line 1 and which is provided at a position separated from the first FET 2 by a quarter wavelength at the operating frequency. Is connected to the source of the second FET 4 perpendicular to the main line 1, has the same length as the first short stub 3, and is separated from the first short stub 3 by a quarter wavelength at the operating frequency. The second short stub 6 provided is a third FET whose drain is connected to the main line 1 and adjacent to the second FET 4, and 7 is vertical to the main line 1 and connected to the source of the third FET 6. And adjacent to the second short stub 5 A short stub 3 is provided, a drain 8 is connected to the main line 1, and a fourth FET 4 is provided at a position separated from the second FET 4 by a quarter wavelength at a working frequency. 4 is a fourth short stub connected to the source of the FET 8 and having the same length as the third short stub 7 and provided at a position separated from the third short stub 7 by a quarter wavelength at the operating frequency. ..

Next, the operation will be described. A microwave signal that passes through the main line 1 by connecting the main line 1 and the first short stub 3 and the main line 1 and the second short stub 5 by turning on the first FET 2 and the second FET 4 at the same time. Can be changed only by a certain phase, and the reflected wave at the connection point between the main line 1 and the first FET 2 and the reflected wave at the connection point between the main line 1 and the second FET 2 are added in opposite phases. Therefore, the reflection accompanying the phase setting can be mitigated. Further, the main line 1 and the third short stub 7, and the main line 1 and the fourth short stub 9 are connected by turning on the third FET 6 and the fourth FET 8 at the same time, and a phase having a value different from the above phase is connected. And the reflected wave at the connection point between the main line 1 and the first FET 2 and the reflected wave at the connection point between the main line 1 and the second FET 2 are added in opposite phases to each other. It is possible to mitigate the reflection caused by. Therefore, the transmission phase of the microwave signal passing through the main line 1 can be finely adjusted by gradually providing the phase amount obtained by the short stub.

[0004]

[Problems to be solved by the device]

 Since the conventional phase adjustment circuit is configured as described above, when preparing a plurality of phase adjustment circuits, the main line has a length that is equal to the quarter wavelength of the operating frequency multiplied by the number of adjustment circuits. is necessary. Therefore, there is a problem that the circuit becomes large when the number of adjusting circuits is increased.

The present invention has been made to solve the above problems, and an object thereof is to miniaturize a circuit without changing the adjustment method.

[0006]

[Means for Solving the Problems]

 The phase adjusting circuit according to the present invention can obtain the change of different phase amounts between the pair of the FET and the subordinate connection circuit of the short stub which are set at the distance of ¼ wavelength for changing the transmission phase. This is achieved by providing one of a pair of another FET and a cascade connection circuit of short stubs.

[0007]

[Action]

 A phase adjustment circuit according to the present invention is provided between a pair of a FET and a short stub slave connection circuit, which are provided for changing a transmission phase by a certain phase amount and are provided at a distance of ¼ wavelength at a use frequency. The size of the entire adjustment circuit is reduced by providing one of a pair of a cascade connection circuit of a short stub and another FET capable of obtaining a change in different phase amount.

[0008]

【Example】

 An embodiment according to this invention is shown in FIG. In FIG. 1, reference numerals 1, 2, 3, 4, and 5 are the same as those in the conventional embodiment, and 6 is a third drain which is connected to the main line 1 and which is provided between the first FET 2 and the second FET 4. Is a third open stub 8 which is perpendicular to the main line 1 and is connected to the source of the third FET 6 and which is provided between the first short stub 5 and the second short stub 7, A drain is connected to the main line 1 and a fourth FET, 9 is provided at a position separated from the second FET 4 by a quarter wavelength at the operating frequency. The fourth FET 9 is perpendicular to the main line 1 and the source of the fourth FET 8. Is a fourth short stub that is connected to the third short stub 7 and has the same length as the third short stub 7 and is provided at a position separated from the third short stub 7 by a quarter wavelength at the operating frequency.

Next, the operation of the embodiment will be described. A microwave that passes through the main line 1 by connecting the main line 1 and the first short stub 3 and the main line 1 and the second short stub 5 by turning on the first FET 2 and the second FET 4 at the same time. The transmission phase of the signal can be changed only by a certain phase, and the reflected wave at the connection point between the main line 1 and the first FET 2 and the reflected wave at the connection point between the main line 1 and the second FET 2 have opposite phases to each other. Therefore, the reflection due to the phase setting can be mitigated. In addition, the main line 1 and the third short stub 7 and the main line 1 and the fourth short stub 9 are connected by turning on the third FET 6 and the fourth FET 8 at the same time, and a value different from the phase is connected. Phase change can be obtained, and the reflected wave at the connection point between the main line 1 and the third FET 6 and the reflected wave at the connection point between the main line 1 and the fourth FET 8 are added in opposite phases to each other. It is possible to mitigate the reflection caused by the setting. Therefore, the transmission phase of the microwave signal passing through the main line 1 can be finely adjusted by gradually providing the phase amount obtained by the short stub.

[0010]

[Effect of the device]

 Since the present invention is configured as described above, it has an effect of downsizing when connecting the phase adjustment circuits in multiple stages.

[Brief description of drawings]

FIG. 1 is a diagram showing a phase adjustment circuit according to an embodiment of the present invention.

FIG. 2 is a diagram showing a conventional phase adjustment circuit.

[Explanation of symbols]

 1 Main Line Passing Microwave Signal 2 First FET 3 First Short Stub 4 Second FET 5 Second Short Stub 6 Third FET 7 Third Short Stub 8 Fourth FET 9 Fourth Short stub

Claims (1)

[Scope of utility model registration request] 1. A main line through which a microwave signal is passed, a first FET having a drain connected to the main line, and a first FET provided perpendicular to the main line and not connected to the main line and having one end at the first FET.
First stub connected to the source of the other and grounded at the other end, and the first FET having the drain connected to the main line
And a second FET provided at a position separated by a quarter wavelength at the used frequency, and a second FET provided perpendicular to the main line and not connected to the main line, and one end connected to the source of the second FET and the other end It is grounded and has the same length as the first short stub and is 1/4 of the first short stub at the operating frequency.
A second short stub provided at a position separated by a wavelength;
A drain connected to the main line, a third FET provided between the first FET and the second FET, and a third FE provided perpendicular to the main line and not connected to the main line and having one end
A third short stub connected to the source of T and grounded at the other end and provided between the first short stub and the second short stub, and a drain connected to the main line and used as a third FET A fourth FET provided at a position separated by a quarter wavelength in frequency, and a fourth FET which is provided perpendicular to the main line, is not connected to the main line, and has one end connected to the source of the fourth FET and the other end grounded. A phase adjusting circuit having the same length as the third short stub and comprising a third short stub and a fourth short stub provided at a position separated by ¼ wavelength at the operating frequency.