Design of High Isolated 2 to 8 Ports MIMO Antenna for High Data Rate UWB Applications

Abstract

With the purpose of exploring novel techniques of reducing mutual coupling between adjacent elements of a MIMO antenna assembly. This research expose the study of four compact MIMO antennas that are dedicated to UWB applications. The study of these UWB MIMO antennas focuses mainly on improving the isolation between radiating elements with remaining a compact structures as well as maintaining a good impedance matching over the whole UWB operating frequency band. The presented MIMO antennas consist of two, four, six, and eight radiating elements. So, with the aim of reducing the inter-elements mutual coupling of each MIMO antenna system, different decoupling techniques are employed, including: diversity techniques which include spatial diversity, polarization diversity, as well as pattern diversity. We find also a ground branch decoupling structure, a circular ripple-shaped decoupling mechanism, and a port-shift based mechanisms. Moreover, to maintain a good impedance matching on each MIMO antenna array, diverse techniques are used, including: stubs integration, slots employment at the radiating elements level, DGS (defected ground structures) employment, and DMS (defected microstrip structure) utilization. In addition, channel capacity loss is discussed in order to deduce channel capacity of each studied UWB MIMO antenna assembly. Experimental results prove the studied antennas diversity performance efficiency, which make them potential candidates for UWB applications.