A Wideband Patch Antenna Array with Improved Isolation in Integrated Sensing and Communication

In this paper, a novel wideband patch antenna array with improved isolation and corrected radiation patterns is proposed in integrated sensing and communication (ISAC) at the X band. The relationship between the self-interference signal and emission waveform of ISAC is firstly analyzed to draw a conclusion that the signal-to-noise ratio (SNR) is directly proportional to the degree of self-interference suppression when the emission waveform is determined across a wide bandwidth. Then, a wideband aperture-coupled patch antenna array with the dual-decoupling technique is introduced to improve the isolation from 8 dB to more than 23 dB within a large bandwidth better than 12.7%. To prove the feasibility of the proposed wideband decoupling scheme, the prototype is also fabricated, and measured. The measured results show good agreement with the simulation data, demonstrating the feasibility of the proposed antenna in broadband ISAC applications.