Bandwidth enhancement and beam squint reduction of leaky modes in a uniaxially anisotropic meta-substrate

Meta-substrates [1, 2] are artificial dielectric substrates with unusual properties. In [2] an anisotropic meta-substrate was proposed with the same fully-space scanning capability as leaky-wave antennas based on composite right/left-handed (CRLH) patterned transmission line (TL) structures. This meta-substrate is a mushroom type structure [3] with uniaxially anisotropic properties, where the wires perpendicular to the air-substrate interface exhibit a Drude permittivity and the loops between the adjacent mushrooms exhibit a Lorentz permeability. This paper presents a rigorous spectral TL approach analysis [4] of this meta-substrate, which is constituted of the anisotropic medium of Fig.1a, with the constitutive parameter tensors. © 2010 IEEE.