Metamaterial Loaded Wideband Highly Isolated Compact 2 × 1 MIMO Antenna for mmWave Applications

In this paper, a highly isolated multiband metamaterial loaded MIMO antenna with wide bandwidth, compact structure is proposed for mmWave range applications. The MIMO antenna (referred as E-MIMO) comprises of a metamaterial loaded antenna elements (called as ENGpatch) which are designed by placing an (newly designed) epsilon negative unit cell at the center of a slotted square patch antenna, designed on 0.4mm thick Rogers 5880 substrate. The E-MIMO antenna is optimized such that without using any additional isolation enhancement techniques, it covers a wide range of frequencies from 23.2GHz to 30.64 GHz and 37.5-43.75GHz with a very high isolation of S12>20dB, for the both resonating bandwidths of 7.44 GHz and 6.25GHz, respectively. With a miniaturized area of 10 × 5mm2 E-MIMO antenna shows excellent MIMO performance metrics high gain of 7.03dB, low envelope correlation coefficient (ECC<0.01), high diversitygain (DG=9.999dB). Thus the proposed MIMO antenna is an ideal choice for various 5G use cases operating in mmWave range