Experimental verification of supercoupling and cloaking using mu-near-zero materials based on a waveguide

Abstract

We theoretically analyze and experimentally demonstrate a waveguide supercoupler and invisibility cloak using anisotropic mu-near-zero (AMNZ) material. Generally, when two waveguides are connected by an abrupt transition, the electromagnetic waves will be scattered by propagating through the abruption with significant loss. When the abrupt transition is filled with the designed AMNZ material whose permeability is zero along the propagating direction, however, we show that the scattering loss will vanish and a total transmission is achieved. Based on the above principle, we also realize a directive invisibility cloak in the waveguide. The AMNZ supercoupler and the cloak are designed, fabricated, and measured, showing good performance. © 2013 AIP Publishing LLC.