Space-time modulated frequency-tunable non-magnetic non-reciprocal bandpass filter

By loading a DC-biased, gradually phase-shifted, low-frequency time-varying modulation signal onto a time-controlled resonator, a non-reciprocal bandpass filter with a continuously adjustable center frequency is realized. This solves the problems of device size and complexity in the prior art and achieves miniaturized and easily integrated non-reciprocal performance.

CN116111969BActive Publication Date: 2026-07-07BEIJING UNIV OF POSTS & TELECOMM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING UNIV OF POSTS & TELECOMM
Filing Date
2023-01-13
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Existing non-reciprocal bandpass filters are large in size, high in cost, difficult to integrate, and have no adjustable frequency. Existing non-magnetic non-reciprocal devices are also complex and large in size, making it difficult to achieve miniaturization and multifunctionality.

Method used

A non-reciprocal bandpass filter with a continuously adjustable center frequency is achieved by loading a gradually phase-shifted low-frequency time-varying modulation signal with DC bias onto two time-controlled resonators. This is achieved by integrating RF input, output, modulation port, coupling line, and variable capacitor on a single-layer circuit board.

Benefits of technology

A non-reciprocal bandpass filter with continuously adjustable center frequency has been realized. It features miniaturization, low complexity, and easy integration, reduces circuit loss, and improves the non-reciprocity of signal transmission. It is suitable for wireless communication systems and sensing systems.

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Abstract

The application provides a kind of space-time modulation type frequency adjustable non-magnetic non-reciprocal band-pass filter, the filter includes: the radio frequency input port is connected with the one end of the transmission line in the first coupling line, and the other end is connected with the first short-circuit stub;The one end of the other transmission line of the first coupling line is connected with the anode of the first variable capacitor, and the other end is connected with the first short-circuit stub;The one end of the transmission line in the open circuit coupling line is simultaneously connected with the cathode of the first variable capacitor and the first modulation port, and the other end is open;The one end of the other transmission line is simultaneously connected with the cathode of the second variable capacitor and the second modulation port, and the other end is open;The radio frequency output port is connected with the one end of the transmission line in the second coupling line, and the other end is connected with the second short-circuit stub;The one end of the other transmission line of the second coupling line is connected with the anode of the second variable capacitor, and the other end is connected with the second short-circuit stub.
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