A novel planar antenna with annulus shape for ultra-wideband (UWB) applications is presented in this paper. The element fed by microstrip line consists of an annulus patch and a truncated ground plane which is used to achieve good impedance match over a broad bandwidth. The performance of the antenna is analyzed and optimized with by software Ansoft HFSS. The proposed antenna is much smaller than the conventional antenna, it has been fabricated by etching copper on the FR4 substrate. The simulated and measured results have shown that the designed antenna covers the 3.1-10.6 GHz band allocated to UWB systems. The radiation pattern and gain characteristics are given.
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