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

In this paper an anisotropic meta-substrate is 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 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 of this meta-substrate, which is constituted of the anisotropic medium with the constitutive parameter tensors.