Design of an isolation improved MIMO antenna using metasurface based absorber for wireless applications

Abstract

The paper intends to present a design of isolation improved MIMO (multiple-input and multiple output) antenna with two elements achieving operating band from 4.04 GHz to 5.48 GHz for wireless applications. The MIMO configuration is comprised of two antenna elements that are maintained at two extreme edges of substrate having dimension of 100 × 50 × 0.8 mm3. The incorporation of metasurface based isolator between MIMO antenna elements provide exceptional isolation (< −23 dB) for practical mobile and wireless application. The mutual coupling of unwanted field between MIMO antenna elements acts as major deterrent to exploit the optimum performance for MIMO antenna. The work focus on design and development of MIMO elements with metasurface based isolator (acting as absorber) clearly with an intention to provide high order optimum isolation levels between two antenna elements. The surface current distribution mechanism provide insight to the high isolation level achieved through incorporation of metasurface based isolator in MIMO setup. The display of spatial/pattern diversity with the attainment of suitable values of envelope correlation coefficient clearly testify its suitability for MIMO based mobile application in microwave regime.