Since its introduction, the transformation electromagnetics design method (J. B. Pendry, et. al, Science, 23, 1780–1782, 2006) has been used to devise innovative microwave and optical devices such as beam-benders, beam-shifters, collimators, and invisibility cloaks. Transformation electromagnetics allows an initial field configuration to be transformed to a desired one via a change in material parameters prescribed by a coordinate transformation. The transformed materials are generally anisotropic and inhomogeneous. Along with volumetric designs, planar transformation-based devices using transmission-line networks have also been pursued. In this work, we present a method to implement planar transformation electromagnetics devices using tensor impedance surfaces.
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