Tunneling and Filtering of Degenerate Microwave Modes in a Polarization-Dependent Waveguide Containing Index Gradient Barriers

Abstract

The drastic difference between complex transmission coefficients for TE 11 and TH 11 GHz modes propagating through subwavelength gradient barriers in a metallic waveguide is examined. Amplitude-phase structures of the transmitted TE 11 and TH 11 modes are described in the framework of an exactly solvable model of these barriers. A sharp contrast in transmission is found between degenerate TE 11 and TH 11 modes distinguished by their polarization structures due to polarization-dependent tunneling and nonlocal energy transport through thin gradient dielectric barriers.