Operation of the Phase Shifter Using Complex Waves of the Circular Waveguide With Periodical Ferrite-Dielectric Filling

Abstract

A circular guide loaded with a periodical ferrite-dielectric rod transversely magnetized through a four pole magnetic field is modeled, using the coupled mode method. The rod is a cascade of several alternating ferrite and dielectric cylinders. In such a guide, traveling wave appears. It occurs in the frequency range where complex waves and normal waves are excited in the ferrite and dielectric slabs, respectively. The propagation features of the guide are examined numerically by using scattering matrix, defined for a cascade of N ferrite-dielectric sections. The simulated and measured scattering characteristics illustrate the change of the polarization parameters of the wave traveling along the guide. This phenomenon is applied to design an antenna in which the polarization state of radiated wave is controlled by a ferrite-dielectric guide configuration. Moreover, the linear phase shift characteristics are observed in the half-plate section when the pattern of magnetized field is rotated. It is established that in comparison to the configuration with uniform ferrite rod the periodical structure has smaller cross-sectional dimensions of the guide and therefore can be better applied as a phase shifters or polarizer.