Multilayer filter based on substrate integrated slow wave space waveguide

Abstract

The invention discloses a multilayer filter based on a substrate integrated slow wave space waveguide. The multilayer filter is a five-layer structure filter composed of two layers of air cavities, two layers of slow wave dielectric plates and a coupling window layer. The transmission transition line from the micro-strip to the partially-filled waveguide and then to the completely-empty waveguide realizes the conversion of the fundamental mode under different conditions in a high-quality manner; metalized through holes are formed in the first dielectric plate and the fifth dielectric plate, and a slow wave effect is introduced, so that an electric field is concentrated in air cavities in the second dielectric plate and the fourth dielectric plate. Different coupling holes are formed in the third dielectric plate, electric coupling or magnetic coupling can be achieved, the slow wave effect and the substrate integrated empty waveguide can be smoothly combined, coexistence of a high Q value and miniaturization is achieved, machining is easy, the structure is compact, and in a microwave circuit and a complex system with strict requirements for miniaturization, the high Q value, low loss and the like, the structure is simple, and the cost is low. Wide application prospects are realized.

Description

technical field [0001] The invention relates to the field of microwave technology, in particular to a multi-layer filter based on a substrate integrated slow wave empty waveguide. Background technique [0002] Due to the characteristics of the substrate-integrated empty waveguide to remove the medium, its size is relatively large. The integrated folded empty waveguide on the substrate will greatly increase the profile, and the integrated half-mode empty waveguide on the substrate will greatly reduce the Q value. Therefore, how to reduce the size of microwave devices on the basis of maintaining its high Q value is researchable , the authorized announcement number in the prior art is: CN110718732B, which is called a substrate-integrated slow-wave empty waveguide for improving the performance of microwave passive devices, and discloses a filter with a three-layer structure. Although it can be used to a certain extent Reduce loss, improve Q value, and realize miniaturization, b...

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Problems solved by technology

The integrated folded empty waveguide on the substrate will greatly increase the profile, and the integrated half-mode empty waveguide on the substrate will greatly reduce the Q value. Therefore, how to reduce the size of microwave devices on the basis of maintaining its high Q value is researchable , the authorized announcement number in the prior art is: CN110718732B, which is called a substrate-integrated slow-wave empty waveguide for improving the performance of microwave passive devices, and discloses a filter with a three-layer structure. Although it can be used to a certain extent Reduce loss, improve Q value, and achieve miniaturization, but its size is still relatively large

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