MIMO Array Decoupling with SSR Structure in Joint Communication and Sensing System

The weight-beamforming algorithm utilized in the joint communication and sensing (JCAS) system has shown promise in mitigating system coupling. However, the algorithm's tendency to set excessive frequency nulls can lead to signal loss. Consequently, this work examines the decoupling process from the perspective of antenna array design and proposes a MIMO antenna array design scheme that operates in the 28 GHz frequency band. This design scheme effectively addresses the coupling issue between the transmitting and receiving antennas by integrating it with beamforming algorithms. By employing SSR metasurface decoupling structures, this approach significantly reduces coupling by approximately 33 dB, resulting in improved system performance and the preservation of transmission information.