High Performance UWB MIMO Antenna by Using Neutralization Line Technique

Abstract

In this work, we propose a compact CoPlanar Waveguide (CPW) fed two-port multipleinput multiple-output (MIMO) antenna with high isolation for Ultra-Wideband (UWB) applications. The proposed antenna consisting of two symmetrical radiators placed side-by-side on an FR-4 substrate with a size of 0.48 0.48 0.01 mm 3 at 3.1 GHz (where = guided wavelength at the lowest frequency of operation). The isolation between the antenna elements is more than 16.5 dB in the entire UWB, which is achieved by introducing in the ground plane a vertical T-shaped neutralization line. The simulation results of the antenna system are in good agreement with the measured one. The proposed antenna covers the entire UWB with an impedance bandwidth 8.6 GHz (from 3.1 to 11.7 GHz), considering the -10 dB standard. The designed UWB MIMO antenna has a low envelope correlation coefficient (less than 0.57), a good efficiency (more than 50%), a low total channel capacity loss (CCL T otal < 0.25 bit/s/Hz), and stable total active reflection coefficient (TARC) attributes, thus meeting the standards applicable to various wireless MIMO applications.