High-temperature superconductive bandwidth-adjustable filter

Abstract

The invention discloses a high-temperature superconductive bandwidth-adjustable filter. The high-temperature superconductive bandwidth-adjustable filter comprises variable capacitors, a high-temperature superconductive substrate and resonators arranged on the high-temperature superconductive substrate. The high-temperature superconductive bandwidth-adjustable filter is characterized in that a microstrip line with the length of 1 is arranged at any position between two adjacent resonators; mutual coupling is led to the two resonators by means of an interdigitated capacitor; one variable capacitor is loaded to the middle part of the microstrip line connecting the adjacent resonators; and a coupling coefficient formed based on the two adjacent resonators is variable. According to the invention, by the control of a program-controlled power supply, the coupling coefficient between adjacent resonators is changed, and the resonant frequency of each resonator is changed by changing the variable capacitors loaded to the resonators, so that the frequency adjustment and the bandwidth adjustment of the filter are realized, and the reconstruction of the filter is realized in the tuning process.

Description

technical field [0001] The patent of the present invention belongs to the technical field of microwave engineering, and in particular relates to a high-performance high-temperature superconducting tuned filter. Background technique [0002] Tunable filters can be used in personal communication systems, frequency hopping receivers, satellite communications, radar systems, etc., and play an increasingly important role in microwave systems. At present, the electronically tuned filter is a relatively common tunable filter because of its simple structure, fast tuning speed, and large tuning range. [0003] Usually, the main structure of an electrically tuned filter resonator is composed of two microstrip lines, one end of the microstrip line is connected with a variable capacitor for tuning the filter frequency, and the other end is connected with a fixed capacitor or another variable capacitor. The capacitors are connected as isolation capacitors for the DC bias of the variable...

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Problems solved by technology

In addition, the series resistance of the capacitor increases with frequency, so at high frequencies, due to the influence of the series resistance of the capacitor, it is difficult for the filter resonator to achieve a high quality factor, so that it is impossible to make a narrow-band tunable filter

[0004] In the design process of electrically tuned filters, the difficulty lies in the change of the coupling coefficient between resonators caused by the change of the relative bandwidth during the frequency adjustment process, and the reconstruction of the coupling coefficient is basically not realized in the traditional tuning method

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