| US 7,492,329 B2 | ||
| Composite material with chirped resonant cells | ||
| Shih-Yuan Wang, Palo Alto, Calif. (US); and Alexandre Bratkovski, Palo Alto, Calif. (US) | ||
| Assigned to Hewlett-Packard Development Company, L.P., Houston, Pa. (US) | ||
| Filed on Oct. 12, 2006, as Appl. No. 11/580,338. | ||
| Prior Publication US 2008/0088524 A1, Apr. 17, 2008 | ||
| Int. Cl. H01Q 15/02 (2006.01) | ||
| U.S. Cl. 343—909 [343/700 MS; 343/756; 343/909; 343/911 R] | 20 Claims |
| 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.
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