Abstract
Electromagnetic transmission through an annular aperture surrounded with corrugations in a PEC plane is investigated based on the mode-matching method. The eigenfunction expansion and Hankel transform are utilized to represent the scattered field in the discrete and continuous modes. We demonstrate that a new type of extraordinary electromagnetic transmission can occur due to the strong excitation of ${\rm TM}_{11}$ mode even if the corrugation is wide, as well as finding the optimal dimensions based on the three-dimensional parametric study.
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