Tunable polarization rotator on a pair of grooved flanges

Abstract

The polarization plane rotators located outside the transmission line volume are presented. Their work is based on the excitation of special (‘dihedral') eigen-oscillations in a waveguide object formed by two corrugated flanges with rotational symmetry. Such a topology provides 3D chirality of the composite object at an azimuthal shift of the flanges and rotation of the polarization plane by an arbitrary angle in the band of a few percent with minimal return loss. In circular and coaxial waveguides, a mechanical or electronic rearrangement of the PP by mutual rotation of the flanges or by the placement of controlled elements (media) into the object cavity is possible.