A Compact Triple Band Metamaterial Inspired Antenna using SRR and Hexagonal Stub for UMTS, WLAN, and WiMAX Applications in S/C Bands

A compact triple band metamaterial (MTM) inspired antenna using split ring resonator (SRR) and hexagonal stub acting as a virtual ground for UMTS, extended UMTS, WLAN, and WiMAX applications in S/C Bands is presented here. The physical dimension of the projected antenna is 28 × 20 × 1.6 mm
³
. Due to MTM loading, compactness (ka = 0.79 <; 1) is achieved resulting the electrical dimension as 0.14 λ
₀
× 0.20 λ
₀
× 0.011 λ
₀
, where λ
₀
is calculated at 2.20 GHz. The antenna gives triple band from (2.12-2.31 GHz), (2.54-2.94 GHz), and (5.27-5.71 GHz) with -10 dB impedance bandwidths of 8.68%, 14.50%, and 8.01% respectively. The simulated gain of 2.41 dBi, 2.37 dBi, and 5.50 dBi are obtained at the center frequency of 2.20 GHz, 2.76 GHz, and 5.49 GHz respectively. The designed triple band MTM antenna has the advantages of easy fabrication, miniaturization, and low profile, which is suitable for various wireless mobile communication protocol like 2.2 GHz UMTS, extended UMTS, 5.8 GHz WLAN, and 5.5 GHz WiMAX applications in S/C bands.