Radiation characteristics of a parallel plate waveguide slot array filled with a transversely magnetized ferrite

Radiation characteristics of a finite periodic slot array in a upper plate of a parallel plate waveguide filled with a transversely magnetized ferrite is analyzed by the method of moments in the case which only the TE₁ mode propagates in the unperturbed parallel plate waveguide. From numerical results, it is found that the frequency dependent characteristic of the radiation efficiency eta_rad is tuned to higher frequency band without significantly changing the maximum radiation efficiency and the radiation frequency bandwidth by varying the applied dc magnetic field. Also, it is explained that the beam scanning of the radiation patterns are caused with the tuning of the frequency dependence of the radiation frequency band by changing the applied dc magnetic field.