The impedance properties of dielectric-covered narrow radiating slots in the broad face of a rectangular waveguide

An extension of Oliner´s theory is used to predict the impedance of slots with dielectric coatings. Theoretical curves are presented which show the change in impedance as a function of dielectric constant, dielectric losses, and dielectric thickness. The effect of a dielectric or plasma upon the resonant frequency is also included. The agreement with experimental dielectric-covered slot data justifies the extension of Oliner´s theory.