Multi-passband high temperature superconducting filter

Abstract

The invention discloses a multi-band high-temperature superconducting filter which comprises a high-temperature superconducting substrate and N sub-filter circuit patterns with different frequency bands, formed on the substrate, wherein the input ends of sub-filters are respectively connected with second ports of corresponding circulators, a first port of the first circulator is used as an input end of the filter, a third port of the nth circulator is connected with a first port of the (n+1)th circulator, and a third port of a (N-1)th circulator is connected with an input port of an Nth sub-filter. Output ends of the sub-filters are connected by adopting a T-type micro-strip matching network or circulators, the circulators are made by adopting low-insertion loss materials working below a liquid nitrogen temperature region and have the advantage of small insertion loss under a low temperature environment. Meanwhile, the problem of difficulty in designing an input coupling network is overcome, and the volume of the filter is greatly reduced due to small size of a resonator. According to the multi-band high-temperature superconducting filter, the requirement of filtering signals of a plurality of bands is met, the out-of-band rejection degree is high, and the problem of difficulty in matching among the sub-filters is solved.

Description

technical field [0001] The invention belongs to the technical field of design of superconducting components and devices, and relates to a high-temperature superconducting filter device, in particular to a high-temperature superconducting filter with a plurality of channels formed by a plurality of sub-filters connected in parallel. Background technique [0002] With the rapid development of the communication industry, the simultaneous existence of various communication standards makes the frequency resources more and more tight, and the requirements for the front-end receiving equipment of the wireless communication system are also getting higher and higher. The specific manifestation is the problem of efficient spectrum utilization, that is, there is an urgent demand for radio frequency filters with high selectivity, small size, low cost, and flexible design. The development of high-temperature superconducting technology has been relatively mature. Filters designed with hig...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the design of the coupling network is difficult and the device volume is large in the existing design scheme of using multiple sub-filters to form a multi-passband filter, and proposes a multi-passband high-temperature superconducting filter

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