Coupling-degree-adjustable bidirectional coupler and adjusting method

Abstract

The invention provides a coupling-degree-adjustable bidirectional coupler which comprises a main microstrip line and an auxiliary microstrip line which are parallel to each other, wherein one end of the main microstrip line is an input end, the other end of the main microstrip line is a straight-through end, the coupling microstrip line is perpendicular to the auxiliary microstrip line, one end of the coupling microstrip line is connected to the midpoint of the auxiliary microstrip line, and the other end of the coupling microstrip line forms a coupling end; two resistors a and b are arranged in the coupling microstrip line; and one side of the coupling microstrip line is provided with an impedance open-circuit line. Compared with a traditional structure, the symmetrical structure ensures that the same coupling degree can be realized at a coupling end regardless of the flow direction of signals; meanwhile, the coupling degree can be conveniently adjusted within a certain range through the design mode of the adjusting resistor, so that the requirements of different users are met, the coupler can be widely applied to transmitting and receiving circuits, meanwhile, flexible adjustment can be carried out, and the application range of the coupler is widened.

Description

technical field [0001] The invention relates to the field of microwave circuits, in particular to an adjustable coupling degree bidirectional coupler and an adjustment method. Background technique [0002] As a microwave passive device, the coupler can perform power distribution and signal isolation of microwave signals in a certain proportion, and is widely used in microwave circuits. The traditional coupler has four ports, which are the input end, the through end, the coupling end and the isolation end, such as figure 1 As shown, the working principle of the coupler is that the microwave signal is input from port 1, part of the input signal is output through the through port 2, and the remaining input signal is output from the coupling port 3. The isolation port 4 is theoretically isolated from the input port, and the output power is zero. The main technical indicators are directivity, standing wave ratio, coupling degree, and insertion loss. [0003] In the microstrip ...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problem of one-way coupling and non-adjustable coupling degree of the traditional parallel microstrip line coupler in the prior art, a symmetrical adjustable coupling degree bidirectional coupler is provided, which realizes the input terminal and the coupling terminal or the reverse through terminal and the Indiscriminate Coupling

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