A novel circularly polarized (CP) planar aperture antenna that is completely self-designed and manufactured with high gain and wideband is proposed in this paper. The antenna adopts a differential feed network so that the energy is evenly transmitted to the radiation patch. By surface current analysis, the closed loop with linearly polarized (LP) characteristics is changed into two arms of different lengths to generate CP radiation. The uniformity and symmetry of energy improve the wideband and high-gain performance of the antenna. The fabricated antenna prototype has the characteristics of a wideband of 33.3% (28.1-39.3 GHz) and an average gain of 11.4 dBic, which could achieve 3-dB axial ratio bandwidth of 12.4% (35.2-39.6 GHz) and a stable left-handed CP and radiation patterns throughout the operating bandwidth with a peak gain of 15.8 dBic.
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