Design and Implementation of an Adaptive Jamming Cancellation Circuit for a Dual-channel RF Front-end

With the rapid increase in electronic devices and intensive exploitation of radio spectrum, the spatial electromagnetic environment has become increasingly complex, and high-power suppressive jamming threatens radar, communication systems significantly. Existing radio frequency front-end jamming suppression technologies suffer from complex circuitry and poor adaptability, especially for non-cooperative unknown jamming. This paper proposes a dual-channel adaptive jamming suppression technology for radio frequency front-end, realizing analog-domain adaptive phase regulation to cancel jamming signals via equal-amplitude opposite-phase combination while preserving desired signals. Simulation shows an ideal jamming suppression ratio of 53.60 dB at the 3 GHz center frequency with only 1.93 dB desired signal loss. Experiments verify over 36 dB suppression in 2 GHz~4 GHz band and stable performance within ±180° incident angles. This technology offers a novel solution for high-power jamming suppression in RF front-ends, combining simplified structure and adaptive regulation and has practical application value for enhancing electronic equipment′s anti-jamming capability.