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Variable and broadband differential phase sections in the THz frequency range

In this paper, polarisation scattering matrices are used to investigate the possibility of developing variable differential phase sections (DPS) made of birefringent elements based on the form birefringence effect. The possibility of developing quarter-wave and half-wave differential phase sections variable in a wide frequency range has been shown. Analysis has confirmed the possibility of developing broadband quarter-wave and half-wave DPS. An experimental study in the long-wave part of the THz range has been conducted.