Modal Theory for Waveguides With Anisotropic Surface Impedance Boundaries


The modal theory for propagation in structures with constant anisotropic surface impedances as a boundary condition is developed for cylindrical waveguides and rectangular waveguides with vertical anisotropic surfaces. Dispersion diagrams for these waveguides are computed for various sets of surface impedances. The results are then validated by comparison, using business software. These results ensure a variety of fascinating properties of such waveguides with anisotropic surface impedances: the cutoff frequency will be drastically lowered, and left-handed mode propagation during a given frequency band will be obtained. The development of this theory will open the door to the development of new design tools for various applications using guided structures like tiny waveguides, filters, positive phase shifters, or horns with glorious radiation properties.

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