High gain multiband circular loop antenna with ring resonators reflectors by using FSS technique

A high gain multiband circular loop antenna with ring resonator reflectors by using FSS technique reaches responsibility in applications for multiband operation and enhanced gain. The applications of multiband operation include WLAN IEEE802.11 b/g (2.4-2.484 GHz), WiMAX (3.3-3.8 GHz), and WLAN IEEE802.11a (5.15-5.35 GHz), consequently. Moreover the presented antenna enhances the gain using the technique of FSS with maximum gains of 9.14 dBi, 11.1 dBi, and 6.64 dBi at the operating frequencies of 2.45 GHz, 3.5 GHz, and 5.25 GHz, respectively. The antenna dimension is about 120 mm × 120 mm × 79.65 mm. The antenna is fed by using the coplanar stripe line. Designed details and results of the proposed antenna are presented and discussed.