Guidance and Leakage Properties of Higher-Order Modes in NRD-Guide and H-Guide With Bianisotropic Split Ring Resonator Metamaterials

A rigorous full wave analysis of nonradiative dielectric guide and H-guide with split ring resonator metamaterials is presented to investigate the different dispersion properties. As is shown, some abnormal higher-order longitudinal-section magnetic (LSM) and longitudinal-section electric (LSE) modes with negative slope of the phase constant versus frequency may come into existence when metamaterials are double negative. Such modes will eventually lead to the leakage. However, for other LSM/LSE modes, leakage can be greatly reduced by utilizing the bianisotropic effects. Particularly, when the metamaterials are of single negative parameters, leakage elimination can be achieved.