Integrated substrate waveguide three-passband filter based on complementary open resonant ring

Abstract

The invention discloses an integrated substrate waveguide three-passband filter based on a complementary open resonant ring. The integrated substrate waveguide three-passband filter comprises a triangular resonant cavity, wherein the triangular resonant cavity comprises a top metal layer, a dielectric substrate and a bottom metal layer which are arranged in parallel from top to bottom in order; three rows of metal pillar through holes parallel to three sides are formed in the dielectric substrate; a microstrip transmission line is extended from the middle position between the midpoints of twosides and the top point of the top metal layer respectively; and a complementary open resonant ring structure is arranged at the central position of the top metal layer; through the connection position of the microstrip line and the relevant parameters of the resonant ring, the equivalent resonant frequency of the resonant ring is adjusted between the main mode and the degenerate mode, so as to realize the filter three-pass band performance; the transmission zero point is generated on each of two sides of each passband sides of each pass band, so that out-of-band harmonics can be suppressed effectively and the frequency selectivity is high; and on the basis of single cavity, the filtering effect of three-passband can be realized, and integrated substrate waveguide three-passband filter based on a complementary open resonant ring meets the requirement for miniaturization and high performance of modern wireless communication.

Description

technical field [0001] The invention relates to an integrated substrate waveguide three-pass band filter based on a complementary split resonant ring, which belongs to the field of microwave technology. Background technique [0002] With the development of modern microwave systems, Substrate Integrated Waveguide (SIW: Substrate Integrated Waveguide) has received extensive attention because of its high quality factor, low loss, small size, and high power capacity. A wide variety of substrate-integrated waveguide filters have been studied in the past decades. At the same time, with the development of modern wireless communication systems, dual-passband and multi-passband filters play a vital role in modern microwave frequency band circuits. However, there have been few studies on the design of multi-passband filters in substrate-integrated waveguide technology in recent years. At the same time, in the current research on multi-passband filters, the filters using cascading an...

AI Technical Summary

Problems solved by technology

However, there have been few studies on the design of multi-passband filters in substrate-integrated waveguide technology in recent years

At the same time, in the current research on multi-passband filters, the filters using cascading and folding techniques have high performance, but the size is too large; while the miniaturized filters have poor performance, especially poor out-of-band rejection.

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