Millimeter-Wave (MMW) Wideband Circularly Polarized Antenna Based on Gap-Waveguide

In this paper, a wideband end-fire circularly polarized (CP) antenna based on gap waveguide (GWG) is proposed for millimeter-wave (MMW) applications. The proposed CP antenna is composed of three layers of groove GWGs with two anti-symmetric triangular septum blades. The groove width is the same with WR-10, and the middle layer is used for feeding energy. The simulation results show that the antenna can achieve a 69.1% bandwidth for both axial ratio (AR)