Title :
Low loss RF modified fishnet metamaterials with optimized negative, zero and unity refractive index behavior
Author :
Jiang, Zhihao ; Bossard, Jeremy A. ; Werner, Douglas H.
Author_Institution :
Dept. of Electr. Eng., Pennsylvania State Univ., University Park, PA, USA
Abstract :
Two planar multilayer negative/zero/unity index metamaterials using cascaded modified fishnet metal screens were considered. The structures were optimized by a GA to have refractive indexes equal to -1, 0, and 1 at predetermined frequencies as well as low absorption loss and an effective impedance matched to free space. The dielectric layers were constrained so that they could be fabricated from existing (commercially available) high performance materials. High figures of merit for both of the refractive indexes and impedances, as well as low transmission losses were achieved. Efforts are currently in progress to fabricate a prototype sample based on our designs and to experimentally validate the predicted neff and Zeff.
Keywords :
genetic algorithms; impedance matching; metamaterials; refractive index; cascaded modified fishnet metal screen; dielectric layers; genetic algorithm; impedance matching; low absorption loss; low loss RF modified fishnet metamaterials; low transmission losses; planar multilayer negative metamaterial; unity index metamaterial; unity refractive index behavior; zero index metamaterial; Metamaterials; Radio frequency; Refractive index;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2009. APSURSI '09. IEEE
Conference_Location :
Charleston, SC
Print_ISBN :
978-1-4244-3647-7
DOI :
10.1109/APS.2009.5172201