Novel dual-passband filter coupler adopting double-layer slotted circular patch

Abstract

The invention discloses a novel dual-passband filter coupler adopting a double-layer slotted circular patch. The coupler comprises an upper dielectric substrate, a metal grounding plate and a lower dielectric substrate which are sequentially arranged in parallel from the top to the bottom, wherein the contours of the upper dielectric substrate, the metal grounding plate and the lower dielectric substrate coincide with one another; a top slotted circular patch, a first port feeder line and a second port feeder line are arranged on the upper surface of the upper dielectric substrate, and a bottom slotted circular patch, a second port feeder line and a third port feeder line are arranged on the lower surface of the lower dielectric substrate. When a signal is input from the first port, a signal output by the second port and a signal output by the third port are equal in amplitude and phase; when a signal is input from the fourth port, a signal output by the second port and a signal outputby the third port are equal in amplitude and opposite in phase. Compared with the prior art, the scheme has the advantages of simple structure, high Q value, high power processing capability and dual-passband performance.

Description

technical field [0001] The invention relates to the technical field of microwave passive devices, in particular to a novel dual-pass band filter coupler using a double-layer slotted circular patch. Background technique [0002] Modern wireless communication systems require compact and high performance filters and couplers. Couplers and bandpass filters play an important role in many RF and microwave applications. In the RF front-end, they are usually used in cascaded form, which is not only bulky but also may degrade performance. In order to reduce the occupied space and improve the performance of the whole circuit, the filter coupler has been explored and received more and more attention as a single multifunctional integrated component, which can provide the function of both a coupler and a band-pass filter. [0003] In document 1 [H.Uchida,N.Yoneda,Y.Konishi and S.Makino,"BandpassDirectional Couplers with Electromagnetically-Coupled Resonators,"2006IEEEMTT-S Internationa...

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Problems solved by technology

[0007] Purpose of the invention: The present invention provides a dual-passband filter coupler using a double-layer slotted circular patch to solve the problems of existing filter couplers with complex structures, low Q value and power tolerance, and incapable of high-power processing It can work in dual frequency, has good circuit performance, and is used in radio frequency front-end circuits of wireless communication systems

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