High-temperature superconducting filter device with controllable transmission zero

Abstract

The invention discloses a high-temperature superconducting filter device with a controllable transmission zero, which is characterized by comprising a high-temperature superconducting substrate and resonators arranged on the substrate. The resonators are arranged in a CQ (Cascade Quadraplets) structure circuit form. The high-temperature superconducting filter device also comprises a cross-coupled line and a variable capacitor, wherein the cross-coupled line introduces cross coupling between any two resonators; and the variable capacitor is connected onto the middle position of the cross-coupled line. According to the high-temperature superconducting filter device with a controllable transmission zero, the capacitance value of the variable capacitor is changed through program control, the CQ structure is realized, performance of a high out-of-band rejection bandpass filter is realized, and electric tuning of the out-of-band transmission zero is controllable.

Description

technical field [0001] The invention belongs to the technical field of microwave engineering, and in particular relates to a high-temperature superconducting filter with controllable transmission zero point. Background technique [0002] Due to the increasing shortage of radio communication frequency resources, the frequency intervals allocated to various communication systems are getting closer and closer, which puts forward higher performance indicators for passive devices, especially front-end passive devices in microwave and millimeter wave transceivers. Requirements to reduce the attenuation of the signal by the front-end system and suppress various interference signals. This requires high-performance frequency-selective devices, and traditional frequency-selective devices (filters) such as Butterworth and Chebyshev filters can only meet the requirements by increasing the order of the filter. In order to obtain better selectivity, Many orders of filters are needed to m...

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Problems solved by technology

[0003] However, usually affected by the processing accuracy, the strength of the cross-coupling introduced by us will inevitably have some deviations, which makes it impossible to achieve the required suppression at some frequency points that we are particularly concerned about outside the passband of the filter, and cannot meet the requirements. Anti-interference requirements require human tuning

For ordinary conventional substrate materials, we can still make corrections through the existing tuning methods, but it is not convenient for manual tuning methods for high-temperature superconducting filters

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