LTE/4G Smart Eyewear Antennas

This paper presents a dual antenna structure for LTE/4G smart eyewear. Two 4G loop antennas are printed on the side of the eyewear frame, each with a 2 mm breakpoint at the bottom boundary of the loop. The leg of the eyewear consists of a metal plane perpendicular to the frame. It also acts as the metal ground plane of the loop antenna. The antenna is feed by a microstrip line. The lower edge of the ground has a parasitic branch parallel to the feed strip. In order to adjust the resonant frequency and matching bandwidth of the antenna, the patch capacitor (C_cap) is loaded into the loop antenna. The two loop antennas can cover the dual frequency bands of 4G, which are 0.824–0.960 GHz and 1.710–2.690 GHz, respectively.