Restoring the orthogonality of two polarizations in Radio communication systems, II

The Poincare sphere has been applied to the analysis of orthogonalizing two polarization ellipses by a differential phase shifter and a differential attenuator. The condition of minimum differential attenuation for removing a given amount of nonorthogonality is determined. A previously reported transformation via two nonorthogonal linear polarizations should be used for two slender ellipses.1 Another transformation via two oppositely rotating ellipses having parallel axes and equal axial ratios should be used for two fat ellipses. System applications of the transformations are discussed.