Patent ID: 7492329
Filing Date: 2009-02-17
Classification: H01Q

Abstract:
1. A composite material, comprising: a dielectric material; and a plurality of non-overlapping local resonant cell groups disposed across said dielectric material, each local resonant cell group comprising a plurality of resonant cells that are small relative to a first wavelength of electromagnetic radiation incident upon said composite material, each local resonant cell group having a spatial extent that is not larger than an order of said first wavelength; wherein, for each of said local resonant cell groups, the resonant cells therein are chirped with respect to at least one geometric feature thereof such that a plurality of different subsets of the resonant cells resonate for a respective plurality of wavelengths in a spectral neighborhood of said first wavelength, said composite material exhibiting at least one of a negative effective permeability and a negative effective permittivity for each of said plurality of wavelengths in said spectral neighborhood.