High Isolation 4-Port UWB MIMO Antenna with Novel Decoupling Structure for High Speed and 5G Communication

Abstract

In this manuscript, CPW fed 4-port multiple-input-multiple-output (MIMO) antenna is designed to cover the ultra-wideband (UWB) range and beyond. The proposed structure has a compact volumetric size of 50x50x1.6 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> . The novel decoupling structure is used to improve the isolation <-20dB across the entire operating band ranging from 3.34 to 14.67 GHz. The realized average gain of the antenna is 3.37 dBi and the corresponding radiation efficiency is more than 70 % throughout the usable frequency band. The radiation patterns at 4.51, 6.91, 8.25 and 10.12 GHz are evaluated and found acceptable for the UWB applications. The diversity parameters envelope correlation coefficient (ECC) and diversity gain (DG) are calculated and found $\lt 0.005$ and $\gt 9.97$ dB, respectively across the operating band. The MIMO design is optimized and results are calculated using CST Microwave studio. The proposed MIMO antenna is suitable for UWB wireless systems, 5G (lower band), and other high-speed communication devices.