Abstract
This paper discusses an analysis of the radiation from a parallel-plate waveguide to determine the effects of loading the waveguide with dielectric plugs near the aperture. We devote special attention to the situation in which the higher order modes, generated by the aperture discontinuity, propagate inside the dielectric plug but are evanescent in the unloaded waveguide region. We show that the dielectric plug may function as a resonant cavity for this type of wave mode. When one of these modes is at resonance, it is strongly excited by the incident wave; the presence of this resonance is manifested by the appearance of sharp spikes in the reflection coefficient either as a function of the frequency or the plug thickness. We also discuss the relation between the resonances in a single waveguide and in array configuration.
Published Version
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