A compact dual‐square‐ring‐shaped slot antenna using a microstrip feed line is proposed for wideband circularly polarized (CP) radiation. The antenna consists of a combined dual‐square‐ring‐shaped slot along the diagonal direction and a microstrip feed‐line along with stub in the orthogonal direction. The slot and feeding structures are fabricated on the opposite planes of a low cost FR4 substrate. The stub width and a dual‐square‐ring‐shaped slot are optimized for wideband CP radiation with good impedance matching. The measured 3‐dB axial ratio and 10‐dB return loss bandwidths of the proposed antenna are 47% (2.1–3.4 GHz) and 75% (1.92–4.25 GHz), respectively. The measured gain is more than 2.0 dBic over the 3‐dB axial ratio bandwidth.
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Nasimuddin et al. (2014) studied this question.
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