DGS and metamaterial incorporated highly isolated wideband MIMO antenna

This research proposes a two-port, highly isolated, wideband multiple-input multiple-output (MIMO) antenna for shared X/Ku band application. The motivation emanates from the growing demand for a compact MIMO antenna that concurrently provide wide bandwidth and high isolation. It measures 31 × 16.6 mm2 (1.3 λ0 × 0.69 λ0). To achieve wide bandwidth, triangular and rectangular slots are inserted in the patch. Two analogous patch antennas are kept 10 mm (0.42 λ0) apart, creating low isolation among the radiators. The design embodies a modified ground plane (DGS) along with a metamaterial (MTM) structure to boost the isolation. The fabricated antenna operating in the 8.39–13.5 GHz (48% impedance bandwidth) range achieves isolation of more than 30 dB. The measured MIMO parameters are as follows: ECC <0.0005, DG ≃ 10 dB, TARC <−8 dB, CCL <0.4 bits/sec/Hz and MEG in between −6 and −8 dB. It achieves a peak gain of 5.57 dBi and a radiation efficiency of >77%. The proposed design efficiently overcomes the challenges associated with narrow bandwidth and mutual coupling, contributing a robust solution for MIMO systems. With its wide bandwidth, strong isolation, high gain, efficiency, and adequate MIMO parameters, the suggested antenna is a good fit for wireless applications in the X and Ku bands.