A dual-polarized transmission-line metamaterial unit cell

Volumetric metamaterials are usually designed to work with an incident wave of a single polarization. In this paper we propose a new volumetric transmission-line metamaterial unit cell which supports two different polarizations. The unit cell is designed by combining the layers of two different volumetric unit cells into a single unit cell. Each layer couples to a different polarization, creating a dual-polarized unit cell. The proposed metamaterial is amenable to standard planar fabrication. We verify our unit cell through full-wave simulations by finding the one-dimensional dispersion relation of the unit cell. We also use a multiconductor transmission-line model to further verify our results.