Electromagnetic branch coupling filter with high out-of-band rejection

Abstract

The invention discloses an electromagnetic branch coupling filter with high out-of-band rejection. The electromagnetic branch coupling filter with high out-of-band rejection comprises a top-layer metal plate, a bottom-layer metal plate, an intermediate dielectric layer and a metal through hole array, wherein the metal through hole array is embedded into the intermediate dielectric layer, the top-layer metal layer, the bottom-layer metal plate and the intermediate dielectric layer are sequentially arranged from top to bottom, the filter also comprises two resonant units, the resonant units areof symmetric structures, and electromagnetic energy transmission is achieved between the resonant units by magnetic coupling. The electromagnetic branch coupling filter has the beneficial effects thatan electrical coupling path and a magnetic coupling path are simultaneously introduced between adjacent resonators by an electromagnetic branch coupling method, and the electrical coupling path and the magnetic coupling path are independent to each other; and compared with cross coupling and electromagnetic hybrid coupling, the electromagnetic branch coupling design is more flexible, and the electromagnetic branch coupling filter has smaller size.

Description

technical field [0001] The invention relates to the field of filters, in particular to an electromagnetic shunt coupling filter with high out-of-band suppression. Background technique [0002] With the rapid development of contemporary mobile communication technology, radio communication frequency resources are becoming increasingly tight, and the frequency intervals allocated to various communication systems are becoming denser. The requirements for multi-channel work are becoming more and more common, and the requirements for separating frequencies are also increasing. High, the number of filters in communication equipment is also increasing. In order to improve the performance index of the communication system, suppress external signals and high-order harmonics generated by mixers, oscillators and other devices, and improve the sensitivity of the receiver, the filter is required to have good frequency selectivity and out-of-band noise suppression capabilities. [0003] M...

AI Technical Summary

Problems solved by technology

This design method is commonly used in the design of waveguide filters or hairpin filters, but it needs to increase the order of the filter, resulting in an increase in size and loss

Unlike cross-coupling, electromagnetic hybrid coupling does not require a complex topology, and can introduce independently controllable transmission zeros in linear topology filters, but can only introduce zeros on one side of the passband, and the electromagnetic between the resonators Hybrid coupling is not easy to adjust independently

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