Experimental Verification of the Effective Medium Properties of a Transmission-Line Metamaterial on a Skewed Lattice

In this letter, we demonstrate, for the first time, an experimental verification of the effective medium properties of a transmission-line metamaterial on a skewed lattice first introduced in our other work (IEEE Trans. Microw. Theory Tech., vol. 59, no. 12, pp. 3272-3282, Dec. 2011). The experimental verification is based on observing refraction of a point source in an isotropic transmission-line metamaterial into an anisotropic transmission-line metamaterial. The anisotropic metamaterial is implemented with a skewed transmission-line lattice to achieve a full material tensor. The effective medium properties of the skewed transmission-line metamaterial are confirmed by comparing the corresponding measured fields to those simulated in an ideal full-tensor anisotropic medium. This letter briefly reviews the theory behind a transmission-line metamaterial on a skewed lattice and presents the design, simulation, and measurement of anisotropic refraction in such a metamaterial.