NONRECIPROCAL COUPLING STRUCTURE OF DIELECTRIC WAVE-GUIDES

M-type hexagonal ferrites have been incorporated in a coupled dielectr ic image guides structure for nonreciprocal microwave circuits design. Two different field configurations have been considered in this paper : for case I the c axis of the ferrite materials was aligned along the direction of propagation; for case II the c axis was aligned in the t ransverse direction. Electromagnetic wave scattering S parameters of t he device were measured for an external biasing magnetic field applied parallel and perpendicular to the c axis of the ferrite slab. We have observed nonreciprocal microwave effects in the ferromagnetic resonan ce regime as a result of a nonuniform external biasing magnetic field along the propagation direction. We believe that ferrite devices opera ting at millimeter-wavelength frequencies, such as isolators, filters, modulators, switches, phase shifter, etc., can be implemented from ou r device design.