A novel band‐notched ultra‐wideband (UWB) planar antenna with a pair of parasitic spiral strips is proposed in this article. The antenna composed of a planar monopole and a plane in the same shape of half circle achieves UWB properties, whereas a pair of parasitic spiral strips with small sizes at the monopole plane can be used to reject certain frequency band. The center frequency and bandwidth of the rejected band are both adjustable by partially changing the shape of the parasitic spiral strips. Numerical examples for the cases without rejection, narrow band or wide band rejection are presented for comparison. Simulated and measured results show that the proposed UWB planar antenna with parasitic spiral strips can be used to obtain band‐notched properties at the desired band.
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Xia et al. (2011) studied this question.
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