Compact Double-Negative Metamaterials Based on Electric and Magnetic Resonators

Abstract

The efficient design of a double-negative (DNG) medium by combining electric and magnetic resonators on the opposite sides of a dielectric substrate is introduced in this letter. The effective parameters of the structure are extracted from numerical data via the Nicolson-Ross-Weir homogenization technique. Two different approaches are implemented to mitigate the well-known branching problem in the determination of Re{ <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">n</i> }, both revealing the negative-refractive properties of the configuration. Moreover, the negative refraction phenomenon is observed by simulating the wave propagation via a wedge-shaped sample of the material. Finally, a dual-band DNG metamaterial is presented as a direct extension of the proposed method toward the design of devices with enhanced attributes for real-world applications.