In this paper, an elliptical-shaped aperture UWB antenna with triple frequency band-rejection characteristics is proposed. The antenna has a compact volume of 22.5 × 24 × 1.5 mm~3. Matching between a sector-disk shaped radiating patch and the 50 Ohm microstrip line is manipulated through a proximity-feed technique. Double shunt stubs are used to enhance the impedance bandwidth of the antenna. The band notches at WiMAX of 3.3-3.9 GHz, lower WLAN of 5.15-5.35 GHz and upper WLAN of 5.725-5.825 GHz are realized by embedding three resonating elements; a reversed F-shaped slot etched in the patch, a reversed U-shaped slot etched in the feed line, and a parasitic flipped C-shaped strip around the patch, respectively. The antenna is fabricated and an electrical equivalent lumped-circuit is obtained. The experimental data show good agreement with the simulation results along with the equivalent circuit results which obtained using Vector Fitting (VF) technique. The antenna provides almost omnidirectional patterns, relatively flat gain and high radiation efficiency over the entire UWB frequency band excluding the rejected ones.
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