A compact planar ultra-wideband ring monopole antenna with a band-notch feature is presented. The band-notch characteristic is achieved by embedding a quarter-wavelength tuning stub in the circular ring monopole. The notched band is controllable by adjusting the length of the tuning stub. The measured antenna radiation patterns show good omnidirectional performance across the operation bandwidth.
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Gao et al. (2005) studied this question.
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