A Compact Audi-Shaped Slotted Multiband Antenna for WiMAX/WLAN/X-band Applications

Abstract

An Audi-shaped slotted triple band antenna for wireless application is presented. The antenna has a very compact dimension of only $0.15 \lambda_{l} \times 0.26 \lambda_{l} \times 0.02 \lambda_{l} \left(12 \times 20 \times 1.6mm^{3}\right)$, at a lower frequency of 3.9 GHz. The antenna shows the resonant behavior at 3.9, 5 and 7.1 GHz with fractional bandwidths of about 4.87% (3.8-3.99 GHz), 4.63% (4.85-5.08 GHz) and 6.88% (6.87-7.36 GHz). Stable radiation pattern, acceptable gain and good impedance matching are observed across the targeted frequencies. The desired antenna can be used for WiMAX (3.9 GHz), WLAN (5 GHz) and X-band (7.1 GHz) applications.