Three-passband high-temperature superconducting balance filter based on double-loop loading

Abstract

The invention belongs to the technical field of microwave communication equipment, and particularly relates to a three-passband high-temperature superconducting balance filter based on double-loop loading, which comprises two double-loop loading stepped impedance resonators, an interdigital structure, an additional high-impedance microstrip line, a transmission line, an input feeder line and an output feeder line, wherein the two double-loop loading stepped impedance resonators are directly coupled through an interdigital structure, an additional high-impedance microstrip line is loaded between loading lines at the upper ends of the middles of the two double-loop loaded stepped impedance resonators, and a transmission line is loaded on the central symmetry plane of the three-passband high-temperature superconducting balance filter. The input feeder line, the output feeder line and the two double-loop loaded stepped impedance resonators are fed in a gap coupling and lap coupling combined mode. The filter has the advantages that the circuit size is small, the structure is compact, and the center frequencies and bandwidths of the three passbands are flexible and controllable.

Description

technical field [0001] The invention belongs to the technical field of microwave communication equipment, and in particular relates to a three-pass high-temperature superconducting balanced filter based on double-ring loading. Background technique [0002] With the rapid development of wireless communication services, the electromagnetic environment is becoming more and more complex, signal interference is becoming more and more serious, and spectrum resources will become increasingly scarce in the future. To reasonably and effectively solve these problems currently faced in the communication system, it is necessary to greatly improve the performance of the receiver in the communication base station and obtain more communication resources by increasing the available frequency band. Due to the development requirements of multi-network, multi-band, multi-service and anti-interference in modern wireless communication systems, research on miniaturized multi-passband balanced fil...

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Problems solved by technology

At present, there have been literatures using a single square ring loaded resonator to realize a dual-band-band balanced filter based on high-temperature superconducting materials, such as "B.Ren et al.,"Differential Dual-BandSuperconducting Bandpass Filter Using Multimode Square Ring Loaded ResonatorsWith Controllable Bandwidths, "IEEE Transactions on Microwave Theory and Techniques, vol.67, no.2, pp.726-737, Feb.2019." However, there is no public report on the design and production of three-pass high-temperature superconducting balanced filters

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