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The authors describe a novel concept for reconfigurable frequency selective surfaces based on metallic dipole and cross-dipole elements connected by switches on an exposed silicon substrate. As the conductivity of silicon can be varied over a large dynamic range by photonic excitation, it represents a good candidate substrate material for producing effective switches. The genetic algorithm was used to obtain optimal performance of the switch with respect to variations of the geometric and electrical parameters of the design for desired excitation frequencies. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 109–114, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22041 [ABSTRACT FROM AUTHOR]

A methodology is presented for the design synthesis of metamaterials that act as thin multifrequency artificial magnetic conductors. These structures are realized by placing a frequency-selective surface above a conventional prefect electric conductor, separated by a thin dielectric layer. The frequency-selective surface design is optimized using a micro-genetic algorithm to operate at multiple, narrow frequency bands. Two examples of genetically engineered multiband high-impedance frequency-selective surfaces (that is, artificial magnetic conductors) are presented and discussed. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 400–403, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11073 [ABSTRACT FROM AUTHOR]

We report one possible approach to synthesizing an artificial magnetic medium over a wide frequency band. A magnetic medium exhibits the property that the phase of the backscattered field relative to the incident field is close to 0°. The magnetic medium proposed in this work is composed of lossy elements in the form of folded dipoles. The reported medium could be applied to reduce the overall backscattered field from objects when suitably combined with a dielectric coating. © 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 27: 27–30, 2000. [ABSTRACT FROM AUTHOR]