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US 6,642,881 B1Granted
Low frequency electromagnetic absorption surface
AssigneeQinetiq Limited
InventorsChristopher R Lawrence, John R Sambles, Alistair P Hibbins
Life of this patent
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Abstract
A radiation absorber comprising a substrate having free charges capable of being driven to form resonance charge density oscillators and a dielectric layer coated onto said surface wherein the dielectric layer has a textured/patterned surface. The substrate is preferably metallic and the dielectric layer is waveform.
Claims9
A microwave or radar radiation absorber comprising:
- a substrate having a surface layer, said surface layer having free charges;
- and
- a dielectric layer coated onto said substrate surface, said dielectric layer having a profiled surface for absorbing incident microwave or radar radiation, said free charges forming resonance charge density oscillators.
A method of reducing microwave or radar radiation from an object comprising the steps of:
- arranging for the radiation to be incident on an article when said article includes a profiled dielectric coated on a substrate having free charges;
- boosting the momentum of incident photons of said radiation to form surface plasmon polaritons at the substrate/dielectric interface;
- and
- absorbing the energy of the incident photons by damping mechanisms.
1 more element
Dependencies are inferred from the claim text.