An UWB circularly polarised (CP) slot antenna with simple structure is presented in this Letter. By etching a simple C‐shaped slot on the planar ground, adopting an L‐shaped strip as a radiator, and employing an off‐centre‐fed structure, the proposed CP antenna can easily be realised with both wideband impedance bandwidth (IBW) and 3 dB axial‐ratio bandwidth (ARBW). The impedance and ARBWs of this antenna can be further expanded by adding a matching stub and cutting an L‐shaped slit on the lower ground. This antenna can realise a wideband IBW ( S 11 < −10 dB) of about 3.62 GHz (124.4%, 1.10–4.72 GHz) and 3 dB ARBW of about 3.6 GHz (115.2%, 1.26–4.68 GHz).
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Xu et al. (2018) studied this question.
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