Abstract: This invention is a multiple channel microwave polarization rotator with external rotary mechanical energy coupling. It finds application in microwave polarization rotators, resolvers, amplitude modulators, and other devices. The device consists of a plurality of collinear axially spaced waveguide cavities sequentially located inside one another. A rotatable conductor, capable of continuous rotation, located within each waveguide cavity is electrically coupled to a stationary transmission line and mechanically connected to rotational devices outside of the transmission line system. The rotatable conductors are connected by nonconductive drive means enabling successive coupling probes to rotate determining the polarization of electromagnetic waves by the rotational position of the coupling probes within the waveguides. The electrical and mechanical couplings are completely independent.