Prototype Verification of Self-Interference Suppression for Constant-Amplitude Full-Duplex Phased Array with Finite Phase Shift

In view of the strong self-interference problem when practical phased array system is simultaneously applied for transmission and reception, under constraints including limited quantization number, constant envelope amplitude, scanning mode, wideband signal etc., this work studies it proposes amplitude-phase joint adjustment method phase-only beamforming optimization. Through digital simulation design, electromagnetic evaluation principle test verification, actual conditions, 6-bit phase or step size 5.625° amplitude 0.5 dB step, transmitting beam pointing (0°, 0°), research has achieved a performance 11.9~14.4 suppression; at same time, optimized shape maintained well, ratio main lobe to side lobes does not change significantly, but gain loss about 2~3 dB. addition, we studied interference suppression feature retention weights in case broadband signals, analyzed influence changes mutual coupling characteristics between elements caused by frequency on cancellation performance. This provides reference application simultaneous receiving technology state.