A rotated transmission-line metamaterial unit cell for transformation-optics applications

Summary form only given, as follows. We introduce a transmission-line metamaterial unit cell to implement a full, symmetric, material tensor, a key criterion in transformation-optics devices. This is achieved by taking an anisotropic metamaterial unit cell and rotating it. We then show how this unit cell can be used to implement a beam expander. To implement the transmission-line grid for the beam expander, we make some approximations for spatial variation in the rotation angle. Full-wave simulation confirms these results.