A New Millimeter Wave Geometric Phase Demonstration

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In this paper we compare two ways of achieving geometrical phase changes in millimeter-wave systems. The first involves the conversion between linear and circular polarizations in a waveguide; the second the conversion between Hermite-Gaussian and Laguerre-Gaussian modes in a quasioptical arrangement. The two ways are demonstrated using a minimum number of specialized waveguide and quasioptical components.