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A dual band‐notched ultrawideband antenna is proposed in this article. The antenna consists of a U‐shaped radiation patch and a ground plane which is symmetric with the edge of the radiation patch. By attaching two T‐shaped slots on the radiation patch and two rectangular complementary split‐ring resonators on both sides of the microstrip line, two notched bands, 3.3–3.7 GHz for WiMAX and 5.15–5.825 GHz for WLAN are achieved, respectively. The dimension of the proposed antenna is 24.6 mm × 38.1 mm × 1.5 mm. The measured result shows that the antenna has a wide impedance bandwidth and omnidirectional radiation patterns. Moreover, time‐domain characteristics and conceptual circuit model based on the input impedance of the proposed antenna are investigated to verify the dual band‐notched characteristics. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1584–1590, 2015

In this article, a dual band‐notched ultrawideband (UWB) antenna is investigated by the equivalent circuit model and time domain characteristics. Transmission line model and L‐C resonant circuit model of the antenna are presented. Transfer function and pulse waveforms are also studied to evaluate the proposed antenna. Experimental results show that the proposed antenna meets the requirement of wide working bandwidth of 3.1–10.6 GHz with voltage‐standing wave ratio <2, while avoiding the interference from WiMAX and 5‐GHz wireless local area network. Radiation patterns and antenna gain study show that the stable radiation characteristics at different frequencies are obtained. The proposed antenna has a compact size, good radiation characteristics, and UWB behaviors to satisfy the requirement of the current UWB wireless communications systems. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2993–3000, 2013

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