Higher-order modes and leakage suppression in NRD-waveguide and H-waveguide with bianisotropic split ring resonator metamaterials

A rigorous full wave analysis of nonradiative dielectric waveguide and H-waveguide with split ring resonator metamaterials is presented to investigate the different dispersion properties. Due to the bianisotropic effects of metamaterials, some abnormal higher-order longitudinal-section magnetic(LSM) and longitudinal-section electric(LSE) modes may come into existence when metamaterials have double negative parameters. However, for other LSM/LSE modes, leakage can be reduced by utilizing the bianisotropic effects. In addition, when the metamaterials have negative permittivity, leakage elimination can be achieved.