基于CSRR去耦合结构的八单元紧凑型宽带MIMO天线OA

To address the degradation of system performance caused by mutual coupling among antenna elements in multi-input multi-output(MIMO)systems for 5G wireless communications,an eight-element MIMO antenna based improved parallel-combined CSRR decoupling structure design tailored for WiFi applications is proposed.The mutual coupling effect among the MIMO antenna units in a 5G wireless communication system leads to a degradation of the system performance.To address this issue,an improved parallel combined CSRR(complementary split-ring resonator)decoupling structure for an eight-element MIMO antenna design tailored for WiFi application scenarios is proposed.The antenna employs a decoupling technique based on CSRRs,achieving an optimal balance among compact structure,wideband operation,and high isolation performance.Experimental results demonstrate that the antenna achieves a-10 dB impedance bandwidth of 19%,with isolation levels of S21>16.7 dB and S81>13.7 dB within the 5.50 GHz to 6.66 GHz operating band;and the antenna system achieves a radiation efficiency of 50%to 86%,a peak gain of 3.28 dBi,an envelope correlation coefficient(ECC)below 0.1,and a diversity gain exceeding 9.91 dB,meeting the requirements for 5G mobile terminal applications.By analyzing the impact of CSRR geometric configurations and spatial arrangements on system performance,this study reveals that the parallel-combined of CSRR structure enhances the isolation through a triple synergistic mechanism comprising resonance band-stop effect,suppression of surface waves,and near-field electric field reconstruction.The research findings provide theoretical insights and technical pathways for the decoupling design o f high-performance MIMO antennas.