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3-Phase Feeding for CP Antenna Elements

This paper is intended to draw attention to underutilized principle of multiphase feeding structures of circular polarized (CP) printed antennas, and especially advantages of using tree phase feeding structures over the more conventional quadrature feeds, like increasing axial ratio (AR) bandwidth. This is done by constructing simple tri-pole radial slot antenna and feeding it by a phasing structure derived from a cross between double-Y baluns and the theory of 3-phase static phase converters.