JPH059001U - Microwave phase adjustment circuit - Google Patents

Abstract

(57) [Summary] [Purpose] Two open stubs are used for 1/4 of the frequency.
The size of the circuit is miniaturized when the phase adjusting circuits provided at a distance of the wavelength are connected in multiple stages. [Composition] Two open stubs are used for 1/4 of the frequency
2 of the phase adjusting circuit provided with a wavelength distance
One open stub of the next-stage phase adjustment circuit is provided between two open stubs.

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. 1 is a main line, 2 is a first FET in which a drain is connected to the main line 1, and a source is grounded in direct current. 3 is a main line 1 Is connected to the source of the first FET2 and is connected to the source of the first FET2, the drain is connected to the main line 1, the source is grounded in direct current, and the first FET2 and the operating frequency are The second FET 5 provided at a position 1/4 wavelength apart in is perpendicular to the main line 1 and connected to the source of the second FET 4 and has the same length as the first open stub 3. The second open stub 6, which is provided at a position separated from the first open stub 3 by a quarter wavelength at the frequency used, has its drain connected to the main line 1 and its source grounded in direct current. And adjacent to the second FET 4 FET 7 is perpendicular to the main line 1 and is connected to the source of the third FET 6, and is a third open stub adjacent to the second open stub 5, and 8 is a drain connected to the main line 1. , A source is grounded in a direct current manner, and a fourth FET, 9 provided at a position separated from the second FET 4 by a quarter wavelength at a working frequency is perpendicular to the main line 1 and a fourth FET 8 is provided. Connected to the source of the third open stub 7 and having the same length as the third open stub 7 and provided at a position separated from the third open stub 7 by a quarter wavelength at the operating frequency. Is a first inductor having the source of the first FET 2 grounded in a direct current and having a sufficiently high impedance with respect to the used frequency, 11 is a source of the second FET 4 is grounded in a direct current, and versus A second inductor 12 having a sufficiently high impedance, a source 12 of the third FET 6 is grounded in a direct current manner, and a third inductor 12 having a sufficiently high impedance with respect to the frequency used, and a fourth FET 8 This is the fourth inductor that grounds the source of DC in a DC manner and has sufficiently high impedance with respect to the used frequency.

Next, the operation will be described. The main line 1 and the first open stub 3 and the main line 1 and the second open stub 5 are connected by simultaneously turning on the first FET 2 and the second FET 4, and a microwave signal passing through the main line 1 is connected. 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 first and third open stubs 7 and the main line 1 and fourth open stubs 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 above phase is connected. It is possible to obtain a change in the phase of, 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. 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 open stub.

[0004]

[Problems to be solved by the device]

 Since the conventional phase adjustment circuit is configured as described above, when multiple phase adjustment circuits are prepared, the main battlefield is a length that is equal to the quarter wavelength of the used frequency and the number of adjustment circuits. Is necessary. Therefore, increasing the number of adjustment circuits causes the circuit to become larger.

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.

[Means for Solving the Problems]

The phase adjustment circuit according to the present invention obtains different phase shifts between the pair of the FET and the open stub cascade connection circuit, which are provided at a quarter wavelength distance that changes the transmission phase. This is aimed at downsizing by providing one of a pair of another FET and an open stub cascade connection circuit that can be used.

[0007]

[Action]

 The phase adjusting circuit according to the present invention is provided for changing the transmission phase by a certain phase amount, and is provided between a pair of an FET and an open-slave sub-connection circuit provided at a distance of ¼ wavelength at a working frequency. The entire adjustment circuit is miniaturized by providing one of a pair of another FET and an open stub cascade connection circuit that can obtain different changes in the phase amount.

[0008]

【Example】

 An embodiment according to this invention is shown in FIG. In FIG. 1, reference numerals 1, 2, 3, 4, 5 are the same as those in the conventional embodiment, 6 is a drain connected to the main line 1, a source is grounded in direct current, and a first FET 2 and a second FET 2. The third FET, 7 provided in the middle of the FET 4 of is perpendicular to the main line 1 and connected to the source of the third FET 6, and is between the first open stub 5 and the second open stub 7. The third open stub 8 provided in the is connected to the main line 1 at the drain, is grounded at the source in direct current, and 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, connected to the source of the fourth FET 8, has the same length as the third open stub 7, and at the frequency used with the third open stub 7 Provided at a position 1/4 wavelength apart The fourth open stub has, 10, 11, 12, 13 is the same as the conventional example.

Next, the operation of the embodiment will be described. A microwave passing through the main line 1 by connecting the main line 1 and the first open stub 3 and the main line 1 and the second open 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. Further, the main line 1 and the third open stub 7 and the main line 1 and the fourth open 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 above 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 providing the phase amount obtained by the open stub in a stepwise manner.

[0010]

[Effect of the device]

 Since the present invention is configured as described above, there is an effect that the size can be reduced 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 Open Stub 4 Second FET 5 Second Open Stub 6 Third FET 7 Third Open Stub 8 Fourth FET 9 Fourth Open stub 10 First inductor 11 Second inductor 12 Third inductor 13 Fourth inductor

Claims (1)

[Claims for utility model registration] [Claim 1] A main line through which a microwave signal is passed, a first FET whose drain is connected to the main line, and whose source is grounded in direct current, and perpendicular to the main line. A first open stub that is provided and is not connected to the main line and has one end connected to the source of the first FET and the other end open; and the drain is connected to the main line and the source is DC A second FET that is grounded and that is separated from the first FET by a quarter wavelength at the operating frequency, and a second FET that is provided perpendicularly to the main line, is not connected to the main line, and has one end being the second Of the second open circuit connected to the source of the FET of the first open stub, having the same length as the first open stub and being separated from the first open stub by a quarter wavelength at the operating frequency. Open stub and drain on main line Emissions is connected and the source is grounded galvanically, and the first F
A third FET provided between the ET and the second FET
Is provided perpendicular to the main line, is not connected to the main line, has one end connected to the source of the third FET, has the other end open, and is between the first open stub and the second open stub. A third open stub provided in the third open stub, a drain connected to the main line, a source grounded in direct current, and a fourth FET provided at a position separated from the third FET by a quarter wavelength at a working frequency. Of the F and the main line are not connected to the main line, and one end is the fourth F
A fourth open which is connected to the source of ET, has the other end open, has the same length as the third open stub, and is provided at a position 1/4 wavelength away from the third open stub at the used frequency. A microwave phase adjustment circuit that consists of stubs and adjusts the transmission phase of the microwave signal that passes through the main line.