Substrate integrated waveguide directional filter

Abstract

The invention relates to a substrate integrated waveguide directional filter, in particular to a combining filter which can be applied to the design of microwave and millimeter wave monolithic circuits and microwave and millimeter wave integrated circuits. The filter is widely applied in microwave and millimeter wave wireless communication systems, satellite communication systems, test instrumentation systems and the like. An upper layer metal copper-clad surface (1) and a lower layer metal copper-clad surface (2) of the filter are respectively arranged at the front side and the reverse side of a medium substrate (3); a plated-though-hole (4) is connected with the upper layer metal copper-clad surface (1) and the lower layer metal copper-clad surface (2) after passing through the medium substrate (3) to form a first substrate integrated waveguide directional coupler (51), a second substrate integrated waveguide directional coupler (52), a third substrate integrated waveguide directional coupler (53), a first substrate integrated waveguide loop (61) and a second substrate integrated waveguide loop (62), thereby enabling the filter to be directly integrated with a radio-frequency circuit. The filter has the characteristics of low insertion loss, high selectivity characteristic, low processing cost, feasible mass production and the like.

Description

Technical field [0001] The invention relates to a multiplex filter that can be applied to the design of microwave and millimeter wave monolithic circuits and microwave and millimeter wave integrated circuits. It has a wide range of applications in microwave and millimeter wave wireless communications, satellite communications, electronic countermeasures, test instruments and other systems . Background technique [0002] A microwave multiplexer filter is a microwave device used to divide the signal spectrum covering a larger frequency range into certain frequency ranges. The main performance indicators of microwave multiplexers are channel isolation and channel loss. The design problem of the multiplexer is a frequently encountered problem in microwave engineering. At first glance, it seems that it is not difficult, just connect several bandpass filters together. But in fact, due to the interaction between the filters, the performance of the device will deteriorate until it cann...

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Problems solved by technology

But in practice, due to the interaction between the filters, the performance of the device will be degraded until it cannot work

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