Abstract
In this paper, a compact ultra-wideband (UWB) slot antenna with two stepped slots is presented. The overall dimension of the antenna is as small as 15 × 25 × 0.8 mm3. The measured impedance bandwidth defined by voltage-standing wave ratios (VWSR) < 2 is from 3.1 to more than 11 GHz. The proposed antenna exhibits a nearly omni-directional radiation pattern, stable gain and constant group delay in the UWB band. Due to the advantages of compact size and simple structure, the proposed antenna is very suitable for various portable UWB systems.
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