Design of a Dual Band-Notched Ultra-wideband Antenna

In this paper, a printed ultra-wideband (UWB) antenna with dual band-notched characteristics suitable for UWB applications is presented. The proposed antenna, by inserting a pair of line-shaped slots into the radiating patch and adding a pair of C-shaped strips coupled to the microstrip feed line, is designed to realize the dual band-notched characteristics at 3.5 GHz and 5.5 GHz, respectively. Good agreement between the simulated and measured results is obtained, which shows that the proposed antenna has a broad impedance bandwidth ranging from 2.3 to 12.5 GHz with VSWR less than 2.0, except the frequency bands of 3.2–3.8 GHz for WiMAX and 5.0–5.9 GHz for WLAN. Moreover, the nearly omnidirectional radiation patterns and stable gain over the operating frequency band have been obtained, which meet the UWB system requirements.