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Abstract
A novel circinal slot antenna with band-notched function suitable for UWB applications is presented and investigated in this paper. This antenna is designed to be used in frequency band of 3.1–10.6 GHz. Band-notched characteristic of antenna to reject the frequency band of 5.15–5.825 GHz, which is limited by IEEE 802.11a, is realized by parasitic inverted-U strip attached to the circinal slot plane. Experimental results show that the proposed antenna meets the requirement of wide-working bandwidth of 2.3–10.6 GHz with VSWR < 2, while avoiding the interference with the 5 GHz WLAN band. The parametric studies are performed numerically, and transfer functions of the antenna systems are given experimentally in this article.