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A freestanding planar NIM comprised of two Au metallic screens sandwiched between three layers of polyimide was optimized to have low loss and an impedance match to free space. Constraints were incorporated into the optimization so that the result is compatible with our fabrication scheme. Measured material properties were included in the full- wave electromagnetic simulation to ensure that the predicted...
Two planar multilayer metallo-dielectric metamaterials with two and four metallic screens, respectively, were optimized by a genetic algorithm to have a zero refractive index and an impedance matched to free space in the mid-IR. The structure geometries were constrained to make fabrication easier and a freestanding device possible. The full- wave simulation predicts excellent performance at the design...
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...
Planar multilayer dual polarized zero index metamaterials using cascaded frequency selective surface screens were presented. Two structures with three and four screens, respectively, were optimized by a genetic algorithm to have a very low effective refractive index and an effective impedance matched to free space. Fabrication constraints on the screen geometry and the dielectric layers were included...
Two planar multilayer negative index metamaterials comprised of cascaded fishnet metal screens were presented. The structures were optimized by a GA in order to gain an effective refractive index of-1 and an effective impedance equal to the impedance of free space. The dielectric layers were constrained for fabrication to be commercially available high performance materials. High figures of merit...
In this work, the low-loss negative index metamaterial (NIM) design methodology that uses two cascaded frequency selective surface (FCC) screens are extended to design multilayer FSS metamaterial that can be fabricated without the need for alignment between fabrication layers. A metamaterial structure using five cascaded FSS screens was proposed and optimized by a genetic algorithm (GA) to have an...
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