Millimeter Wave Antenna Array with Circular Polarization
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Loop radiation elements with circular polarization radiation pattern are investigated. The research includes, also, two-dimensional array with loop elements and feeding network on the same dielectric substrate. Simulation for substrate epsilon(R) = 1 gives appropriate radiation pattern and axial ratio (AR). Simulation for substrate epsilon(R) =2.17 and h=lambda(g)/40 gives large deformations of radiation pattern and AR. The reason is surface waves. The surface waves are suppressed perforating the substrate with holes. Radiation array 8x8=64 is realized in the frequency range around 60 GHz.