Abstract
A coplanar wave guide fed (CPW) UWB antenna with provision for rejecting WiMAX band is proposed. The antenna consists of a circular disc which is truncated at the top and a rectangular ground plane with semi-elliptically shaped upper edge. Overall size of the antenna is 25 mm x 20 mm x 1.6 mm. Folded U-slot etched on the radiating patch produces the band rejection characteristics at WiMAX. The S11 (< -10 dB) bandwidth of the antenna varies from 3.1 GHz to greater than 12 GHz with satisfactory band rejection over the range of 3.35 GHz to 3.8 GHz. The extent of pulse distortions due to the antenna is analysed by the antenna transfer functions and group delay measurements. Effects of folded U-slot on the antenna characteristics both in frequency domain and time domain are presented.
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