Abstract
In this paper, a broadband differentially fed circularly polarized (CP) patch antenna is designed. Combined with the field distribution of patch antenna, a double-layer differential microstrip feeding structure is proposed to form a circular polarization. The differential CP antenna works around 28.0 GHz, with a −10 dB impedance bandwidth and 3-dB impedance bandwidth of 13.2% and 7.0%, respectively. Within the achieved bandwidth, the radiation pattern has excellent conformality and symmetry. The height of the antenna is only <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$0.049\lambda_{0}$</tex> ( <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\lambda_{0}$</tex> is the operating wavelength at 29.0 GHz in the free space), achieving a low-profile design.
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