A two-way coupler with adjustable coupling degree and its adjustment method

Abstract

The invention provides a bidirectional coupler with adjustable coupling degree, which includes parallel main microstrip lines and auxiliary microstrip lines, one end of the main microstrip line is an input end, the other end is a straight-through end, and a coupling microstrip line is also included. The coupling microstrip line is perpendicular to the secondary microstrip line and one end is connected at the midpoint of the secondary microstrip line, and the other end forms a coupling end; two resistors a, b are provided in the coupling microstrip line; the coupling microstrip line one There is an impedance open line on the side. Compared with the traditional structure, this symmetrical structure ensures that the same coupling degree can be achieved at the coupling end regardless of the signal flow direction; at the same time, the design method of adjusting the resistance can easily adjust the coupling degree within a certain range, so as to meet the needs of different users. It can be widely used in transceiver circuits, and can be adjusted flexibly, thereby widening the application range of the coupler.

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 distribute the power and isolate the microwave signal in a certain proportion, and is widely used in microwave circuits. The traditional coupler has four ports, namely input end, through end, coupling end and isolation end, such as figure 1 As shown, the working principle of the coupler is that the microwave signal is input from port 1, a part of the input signal is output through the straight-through port 2, the remaining input signal is output by 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, and insertion loss. [0003] In the design of microstrip couplers, such as figure...

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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