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Transmission through a slot in a an infinite metallic shield of finitethickness, inhomogeneously loaded with dielectric material, is modeled using ananalytical approximation based on the slot being small compared to a free spacewavelength. Resonances of relatively broad bandwidth (Fabry-Perot) as well asof very narrow bandwidth (Fano) are found. We show that by introducing a gap ofdifferent dielectric constant within the slot, we can control the separationbetween the broad bandwidth resonances, and the locations and magnitudes of thevery narrow bandwidth resonances. The influence of grooves on both kinds ofresonances is considered using the same analytical model. The effect of lossesin the dielectric slot is also considered, using data for commerciallyavailable dielectrics.

The Effect of Inhomogeneous Dielectric Loading on Transmission Through a Slot in an Infinite Thick Metallic Shield