A Wearable Millimeter Wave MIMO Antenna Design For High Frequency Applications

Abstract

In this paper, we propose an improved methodology for the reduction of mutual coupling within millimeter-wave (mmwave) wearable multiple-input and multiple-output (MIMO) antennas. Such approach is crucial for high frequency applications. The important parameters such as return loss (with best matching having $S_{11}\, \lt -10$ dB with 35 GHz centered frequency), radiation pattern, diversity gain (DG $\gt 9.99)$, envelop correlation coefficient (ECC $\lt 0.05)$, and mutual coupling evaluate the presented antenna. The main issue that arises in MIMO antenna is mutual coupling. We mitigate this problem by introducing slots on either end of the transmission line. We achieve a reduced mutual coupling even less than -36 dB and it works within a high-frequency range, which is its beauty.