CPW-Fed Multiband CRLH Antenna for GPS, ISM and 5G Applications

A coplanar waveguide-fed multiband composite right/left-handed (CRLH) antenna, a class of metamaterials (MTMs) is presented in this paper. It is designed by embedding two unit-cells of CRLH transmission line on the top and bottom surfaces of an FR4 epoxy substrate with the help of metallic vias. The multiband characteristic is obtained by generating four resonances due to CRLH unit-cells, feed-patch and the ground plane. The simulated results show three frequency bands spanning over 1.3 to 1.87 GHz, 2.36 to 2.63 GHz and 3.14 to 4.62 GHz with return loss below – 10 dB. The realized gains have been found as 2.5, 2.56, 4.85 and 4.9 dB at the resonant frequencies of 1.57, 2.4, 3.4 and 4.2 GHz respectively. The radiation efficiency is well above 77% at each resonant frequency with a peak value of 94.76%. The proposed antenna is suitable for Global Positioning System (GPS) (1.57 GHz), Industrial, Scientific and Medical (ISM) (2.4 GHz), and 5G sub-6 GHz infrastructure (3.3-4.2 GHz) applications.