A compact L-band multi-channel superconducting filter receiver front-end assembly

By combining a low-pass filter, limiter, RF switch, through RF cable, superconducting bandpass filter bank, low-noise amplifier circuit and digitally controlled attenuator, the problems of large in-band insertion loss and high noise figure of RF receiver front-end are solved, and normal operation and high out-of-band rejection performance are achieved in low-temperature environment.

CN118100970BActive Publication Date: 2026-05-01FUJIAN XINGHAI COMM TECH
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Patent Information

Application Number
CN202311840313.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-12-28
Publication Date
2026-05-01
Estimated Expiration
2043-12-28

AI Technical Summary

Technical Problem

Existing RF receiver front-end filters suffer from problems such as large in-band insertion loss, high noise figure, and difficulty in operating normally in low-temperature environments.

Method used

A compact L-band multi-channel superconducting filter receiver front-end assembly is achieved by combining a low-pass filter, limiter, RF switch, through RF cable, superconducting bandpass filter bank, low-noise amplifier circuit and digitally controlled attenuator, and using asymmetric variable-pitch double helix resonant cavity and variable impedance feeder with room temperature components and superconducting filter.

Benefits of technology

The power capacity of the filter was increased, the noise figure was reduced, the receiving link was ensured to work normally in low temperature environments, and the receiving sensitivity and out-of-band rejection performance were improved.

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Abstract

The present application relates to the technical field of microwave circuit, especially to a compact L-band multi-path superconducting filter receiving front-end component, which is composed of a low-pass filter, a limiter, a first radio frequency switch, a straight-through radio frequency cable, a superconducting band-pass filter group, a second radio frequency switch, a low-noise amplification circuit and a digital control attenuator, and forms the compact L-band multi-path superconducting filter receiving front-end component through the connection relationship among them, realizes the combination of normal-temperature devices and superconducting filter components, improves the power capacity of the filter, and ensures the normal work of the receiving link under the failure condition of low-temperature environment.
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