Bianisotropic Huygens' metasurface leaky-wave antenna with flexible design parameters

Abstract

We propose a novel leaky-wave antenna configuration which consists of a parallel-plate waveguide with the top plate being a bianisotropic Huygens' metasurface of the omega type. By using closed-form expressions for the metasurface design and after a valid stipulation of the fields below and above it, we are able to design a passive and lossless metasurface that achieves the desired field transformation. The theoretical formulation highlights that we have practically all possible degrees of freedom in the stipulation of the input and output fields. In this way, several examples show that we can arbitrarily choose the output angle, the constant leakage factor and the waveguide height.