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

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.