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Abstract
In this paper, a planar single layer circular polarized array antenna is proposed using sequential-phased feeding network in V-band frequency range based on gap waveguide technology. The antenna used a 2×2 elements with 45-degree tilted slots to provide proper electrical field distribution in the slots to produce circular polarization. To excite slots, a feeding network based on combination of E-plane groove and ridge gap waveguide is utilized. To realize 90-degree phase rotation between slots, ridge waveguides are inversely shifted. The proposed antenna presents 14% impedance bandwidth below -10 dB and 8% axial ratio bandwidth under 3 dB.
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