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Matched Impedance Thin Planar Composite Magneto-Dielectric Metasurfaces

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4 Author(s)
Bayraktar, Z. ; Dept. of Electr. Eng., Pennsylvania State Univ. (Penn State), University Park, PA, USA ; Gregory, M.D. ; Wang, Xiande ; Werner, D.H.

A novel methodology is presented for the design synthesis of matched impedance thin planar composite magneto-dielectric metasurfaces. The design synthesis involves optimizing thin, metallo-dielectric metasurfaces comprised of a periodic array of electrically small and rotationally symmetric metallic unit cells which are sandwiched between two thin dielectric layers and backed by a perfectly conducting ground plane. Optimization of the structures is carried out with a genetic algorithm (GA) to obtain a design with electromagnetic properties that are equivalent to a desired matched-impedance homogeneous medium of the same thickness. Optimized design results demonstrate the effectiveness of this new technique in synthesizing thin planar composite matched-impedance magneto-dielectric metasurfaces (MIMDM). To validate the approach, full-wave simulations of the actual metamaterial structure were compared with results obtained by employing an equivalent homogeneous effective medium and found to be in excellent agreement. Several designs are optimized with targeted applications such as substrates for miniaturized patch antennas and electromagnetic absorbing materials.

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Antennas and Propagation, IEEE Transactions on  (Volume:60 ,  Issue: 4 )