Compact Super Wideband Two-element MIMO Antenna for 5G Millimeter-Wave Applications

Abstract

A novel two-element super-wideband (SWB), multiple-input multiple-output (MIMO) antenna for fifthgeneration (5G) millimeter-wave (MMW) applications is presented in this work. The single-element antenna is composed of one circular and one trapezoidal segment to create a new patch shape feeding by a tapered microstrip line with a partial ground plane. A two-element MIMO antenna with dimensions of 22 mm $\times$ 34 mm $\times$ 1.6 mm is proposed. To ensure high isolation between the 2 ports, inverted L-shaped stubs with a rectangular cut are introduced into the common ground plane. The operating frequency band for |SII|$\leq$-10dB is from 3.2 GHz to 50 GHz (bandwidth of 176% and a bandwidth ratio of 15.62:1) with isolation of 19 dB(22dB for most of the operating band from 10 to 50 GHz), a high realized gain of 6.3 dB, and good radiation efficiency of 71.2% over the whole SWB frequencies. The obtained results in terms of performance are compared to other studies reported in the recent literature.