Degeneration of quasi-static resonances in an impedance circular cylinder covered by a metamaterial layer

摘要

An impedance cylinder covered by a metamaterial layer is considered. The 2D problem of excitation of the cylinder by a magnetic-current filament is analyzed. High-Q surface-wave resonances formed in cylinders of small (as compared to the wavelength) dimensions are investigated. The effect of degeneration of oscillations with different indices m in the law cos(m phi), which describes the azimuthal dependence of resonance fields, is discovered. The spatial and frequency characteristics of degenerate oscillations are numerically investigated on the basis of rigorous methods.