Method for realizing adjustability of coupling degree of coupler

Abstract

Disclosed is a method for realizing adjustability of the coupling degree of a directional coupler. A concentration element resistor and a capacitor are added at a coupling end of the coupler, and the impedance of a port is changed, so that the coupling degree is changed. According to the method, the strip-line directional coupler with the adjustable coupling degree is designed and mainly comprises a coupler shell 31, two same dielectric plates 41, a 50-ohm chip resistor 53, an adjustable chip capacitor 52 and a capacitance adjusting metal rod 32. The resistor 53 and the capacitor 52 which are parallelly connected in a group are added on the inner side of a microstrip line in front of the coupling end, and an open-circuit node 51 is added on the inner side of a microstrip line in front of an isolation end in order to improve isolation. The impedance of the coupling port is changed by adjusting capacitance through the metal rod 32, and the coupling degree and the isolation of the coupler are changed, so that the coupling degree of the coupler can be adjusted.

Description

technical field [0001] This patent relates to a microwave device directional coupler. Background technique [0002] A directional coupler is a directional power coupling (distribution) element. It is a four-port component that is usually composed of two sections of transmission line called a straight line (primary line) and a coupled line (secondary line). The working principle of a directional coupler is as follows figure 1 As shown, a part (or all) of the power of the through line is coupled into the coupled line through a certain coupling mechanism (such as slots, holes, coupled line segments, etc.) between the straight line and the coupled line, and it is required that the power is only transmitted in the coupled line To one output port, the other port has no power output. If the propagation direction of the wave in the straight-through line becomes opposite to the original direction, the power output port and the non-power output port in the coupled line will also ch...

AI Technical Summary

Problems solved by technology

If it is found that a certain parameter cannot meet the index requirements during the test, the coupler shell must be opened to adjust the internal structure. The debugging process is quite complicated and cumbersome.

Secondly, the versatility of traditional directional couplers is not strong. Due to structural limitations, each coupler can only be used in products with specific coupling requirements

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