Compact MIMO antenna for application to smart glasses using T-shaped ground plane

Abstract

A compact multiple-input multiple-output (MIMO) antenna design for application to smart glasses is proposed in this letter. The proposed MIMO antenna system is comprised of two symmetrical meander antennas operating in the 2.4-GHz wireless local area network band and a T-shaped ground for high isolation. The operation mechanism of the proposed MIMO antennas can be explained using the analysis of a three-port network. Accordingly, the T-shaped ground plane operates as a decoupling structure such that the isolation between antennas can be controlled by tuning the T-shaped ground plane. The reflection coefficient characteristic was measured to be less than -7.5 dB, whereas the isolation obtained was higher than 15 dB. The diversity performance was evaluated using the measured three-dimensional radiation patterns, and the envelope correlation coefficients in the target band were less than 0.1.