Abstract
Resonance inhomogeneities as cavity-backed apertures are proposedfor the mode selection in open resonators. The suggested cavity-backedapertures inhomogeneities is a perfectly conductive circular cylinderwith a longitudinal slot. A superposition of two plane wavespropagating in opposite directions is considered as an incident fieldin the theoretical research. It is shown that the slotted cylinder canboth be imperceptible for an initial stationary wave field andefficiently scattered it in dependance of the parameters of thecylinder. The experimental results in the 8mm wave band are in goodagreement with numerical data. An rotation of the cylinder or itsshift from the determined position toward the open resonator mirrorslead to the considerable increasing of the scattered field energy andconsequently to decreasing the open resonator Q.
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