JPH052404U - Microwave phase adjustment circuit - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] Two short 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. [Structure] Two short stubs are 1/4 of the used frequency
One short stub 4 of the phase adjusting circuit of the next stage is provided between the two short stubs 2 and 3 of the phase adjusting circuit which are provided with a distance of 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 parallel to the main line 1, and a first short stub that is not connected to the main line 1 and 3 is a parallel line to the main line 1. A second short stub 4 having the same length as the first short stub 2 and provided at a position separated from the first short stub 2 by a quarter wavelength at a used frequency is parallel to the main line 1 and is a main line. The third short stub 5, which is not connected to the line 1 and is adjacent to the second short stub 3, is parallel to the main line 1 and has the same length as the third short stub 4 and the third short stub 4 And a fourth short stub provided at a position separated by 1/4 wavelength at the used frequency. Reference numeral 6 is a connection line that connects the main line 1 and the short stub.

Next, the operation will be described. When the main line 1 and the first short stub 2 and the second short stub 3 are connected by the connection line 6, the phase of the microwave signal passing through the main line 1 can be changed only by a certain phase amount. The reflected waves from the first short stub 2 and the second short stub 3 are added in opposite phase at the microwave signal input end, so the amount of reflection can be reduced. Further, when the main line 1, the third short stub 4 and the fourth short stub 5 are connected by the connection line 6, it is possible to obtain a change in the phase amount different from the above-mentioned phase amount. 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 multiple phase adjustment circuits are prepared, the main line has a length equal to the quarter wavelength of the used frequency multiplied by 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 adjusting method.

[0006]

[Means for Solving the Problems]

 The phase adjusting circuit according to the present invention has another set of short stubs that can obtain different phase amount changes between a set of short stubs that are set at a distance of ¼ wavelength that changes the transmission phase. By providing one short stub, the size is reduced.

[0007]

[Action]

 The phase adjustment circuit according to the present invention is configured to change the transmission phase between a pair of short stubs provided at a distance of ¼ wavelength at a working frequency in order to change the transmission phase by a certain phase amount. By providing one short stub of a pair of short stubs provided to change only the different phase amount, the entire adjustment circuit can be miniaturized.

[0008]

【Example】

 An embodiment according to this invention is shown in FIG. In FIG. 1, 1 is a main line through which a microwave signal is passed, 2 is a first short stub parallel to main line 1 and not connected to main line 1, and 3 is parallel to main line 1 and a first short. A second short stub 4 having the same length as the stub 2 and provided at a position separated from the first short stub 2 by a quarter wavelength at the operating frequency, is parallel to the main line 1 and is connected to the main line 1. And the third short stub 5 provided between the first short stub 2 and the second short stub 3 is parallel to the main line 1 and has the same length as the third short stub 4. It is a fourth short stub which is not connected to the main line and is provided at a position separated from the third short stub 4 by a quarter wavelength at the operating frequency. Reference numeral 6 is a connection line 6 that connects the main line 1 and the short stub.

Next, the operation of the embodiment will be described. When the main line 1 and the first short stub 2 and the second short stub 3 are connected by the connection line 6, the transmission phase of the microwave signal passing through the main line 1 can be changed by a certain phase amount. The reflected waves from the first short stub 2 and the second short stub 3 are added in opposite phase at the input end of the microwave signal, so that the amount of reflection can be reduced. Further, when the main line 1 is connected to the third short stub 4 and the fourth short stub 5, it is possible to obtain a change in the phase amount different from the above-mentioned phase amount. 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, 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 through which microwave signal passes 2 first short stub 3 second short stub 4 third short stub 5 fourth short stub 6 connection line

Claims (1)

[Claims for utility model registration] [Claim 1] A main line for passing a microwave signal and a main line are provided in parallel with each other and are not connected to the main line, and one end is close to the main line and the other end is open. The first short stub is provided in parallel with the main line, is not connected to the main line, has one end close to the main line, has the other end open, and has the same length as the first short stub; The second short stub provided at a position separated from the short stub by 1/4 wavelength at the used frequency, and the second short stub provided in parallel with the main line and not connected to the main line, and one end of which is close to the main line, A third short stub having an open end and provided between the first short stub and the second short stub is provided in parallel with the main line, is not connected to the main line, and has one end as the main line. Same as the third short stub with close proximity to the other end open It has a length, and the third short stub and use frequency 1
/ 4 wavelength stubs provided at a distance of / 4 wavelength and the main line is passed by connecting the main line with the first and second short stubs or the third and fourth short stubs with a connection line. A microwave phase adjustment circuit that adjusts the transmission phase of the microwave signal.