In this paper, the design, simulation, and fabrication of a novel printed circular slot antenna with a band-notched function suitable for UWB application is presented and investigated. The band-notched characteristic is achieved and adjusted by inserting L-shaped branches into the ground plane. Experimental results show that the proposed antenna meets the requirement of wide working bandwidth of 3.1-10.6 GHz with return loss < -10dB, while avoiding the interference with the 5-GHz WLAN band. The study of transfer function (amplitude of S(21)/group delay) and time domain characteristic (fidelity/power spectrum density (PSD) ) indicate a band-notched function of the antenna. The proposed antenna has a compact size, good radiation characteristics, ultra wide band-width, and good time-domain behaviors to satisfy the requirement of the current wireless communication systems.
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Gao et al. (2009) studied this question.
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