Abstract
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 smiling- mouth-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 efiectively generate three difierent resonances to cover the WLAN/WiMAX bands. The measured results show that the antenna has three separated impedance bandwidths for S11 < i10dB of 550MHz (2.36GHz{2.91GHz), 790MHz (3.27GHz{4.06GHz) and 810MHz (5.07GHz{5.88GHz), and the measured gain is above 2.8dB over the operating band, which can be well applied for both 2.4/5.2/5.8GHz WLAN bands and 2.5/3.5/5.5GHz WiMAX bands.
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