A Novel Face-Like Triple-Band Antenna for WLAN/WiMAX Applications

A novel microstrip antenna for triple-band WLAN/WiMAX applications is presented. Based on a face-shaped slot, the antenna consists of a pair of symmetrical eye-like patches, a smilingmouth-shaped feeding line and a rectangular stub that looks like the fringe. The resonant mode at 3.5GHz is excited by the basic radiation patch with the face-shaped slot. By adding a rectangular fringe-shaped stub on the top of the radiation patch and a pair of symmetrical eye-like patches without increasing the size of the antenna, the antenna can effectively generate three different resonances to cover the WLAN/WiMAX bands. The measured results show that the antenna has three separated impedance bandwidths for S11 < −10 dB of 550MHz (2.36 GHz–2.91 GHz), 790MHz (3.27 GHz–4.06 GHz) and 810MHz (5.07 GHz–5.88 GHz), and the measured gain is above 2.8 dB over the operating band, which can be well applied for both 2.4/5.2/5.8 GHz WLAN bands and 2.5/3.5/5.5 GHz WiMAX bands.