UWB-MIMO DGS loaded patch antenna with low profile for millimeter-wave applications

A multiple-input multiple-output (MIMO) antenna with a defective ground surface (DGS) is proposed for next-generation millimeter-wave communication. The designed antenna consists of a pair of mushroom shape radiating units with two square ring-loaded defected common ground plane. The antenna is printed on duroid-5880 high-frequency laminates (loss tangent 0.0009, relative permittivity 2.2). Significant bandwidth ranges from 31.6 GHz to 48.8 GHz (impedance bandwidth of 43.17%) is obtained during the investigation of the antenna. The introduced MIMO antenna exhibits a low mutual coupling (|S21|, |S12| < −20) dB with the incorporation of DGS. The antenna performance parameters defined as return loss, radiation pattern, gain, the radiation efficiency is examined. Many diversity parameters are also discussed in terms of mutual coupling, envelop correlation coefficient (ECC < 0.002), diversity gain (DG > 9.995), and channel capacity loss (CCL < 0.3 bits/sec/Hz) across the ultra-wide band (UWB) frequencies. Simulated results are verified by the measured results, and good agreement is observed between them. These distinguishable attributes with the simple configuration model the propound MIMO antenna suitable for millimeter-wave applications.