A new quasi-magnetic-electric circularly polarized (CP) patch antenna with a wide bandwidth is proposed. The proposed antenna has a low-profile structure with a single feed and provides CP radiation with a stable gain. It consists of a shorted bowtie patch antenna that works as an equivalent magnetic current source and a bowtie dipole that acts as an electric current source. With a single feed, the two orthogonal current sources are combined to generate a circular polarization. For the proposed antenna, measurement results show that an impedance bandwidth of 31.7% and a 3 dB axial-ratio bandwidth of 15.3% are achieved. The antenna has a gain of about 7 dBic in the band of interest and a cross-polarization level of about -19 dB at the central frequency.
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Li et al. (2019) studied this question.
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