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Dielectric Metamaterials: Toward Low-Loss, Single Element Backward Wave Metamaterials
Keywords: metamaterial, ceramic, loss
As an alternative to metal-based metamaterials, magnetodielectric metamaterials have recently been developed using resonant dielectric spheres and cubes of high permittivity microwave ceramics. Conventional approaches for obtaining metamaterial properties (±µ, ±) are based on orientation-dependent, lossy metallic structures, such as split ring resonator/wire pairs, fishnet- and omega-shaped structures. This alternative dielectric route, via Mie resonances of magnetodielectric structures, provides a mechanism for engineered electrical and magnetic response. In this presentation, modeling of loss contributions and split-resonator behavior will be presented, demonstrating an approach for achieving double negative (DNG) metamaterial composite at Ku band and optical frequencies. The influence of microwave ceramic resonator properties, including Q, permittivity variation, ceramic microstructure, and dimensional tolerances will be discussed. Microwave ceramic properties and metamaterials comprised of MgTiO3, (Zr,Sn,Ti)O2, SrTiO3 and Ba(Zn,Ta)O3 will be presented as a function of resonator design. It is observed that resonator Q tracks closely with dielectric Q, and that low Q materials may prevent useful metamaterial development. Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000.
Paul G. Clem, Manager
Sandia National Laboratories
Albuquerque, NM

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