Articles for electromagnetic wave attenuation
AssigneeHenkel AG & Co. KGaA
InventorCheng Gu
Life of this patent
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Abstract
An interface article for attenuating electromagnetic frequency radiation includes a multiple-layer construction with a first layer having a low index of refraction, and a second layer having a high index of refraction. The article includes ceramic fillers, metallic fillers, graphite fillers, or combinations thereof dispersed in a polymeric matrix. The interface article is tunable to exhibit at least 75% reduction of reflection of incident electromagnetic radiation at a target frequency of between 0.3-100 GHz.
Claims20
An article for attenuating electromagnetic radiation, the article comprising:
- a first layer having a first thickness defined between an incident surface and a transition surface thereof, a first polymer matrix, and a first filler in the first polymer matrix, wherein the first layer exhibits a first index of refraction to the electromagnetic radiation;
- and
- a second layer disposed at the transition surface of the first layer, the second layer having a second polymer matrix and a second filler in the second polymer matrix suitable to absorb at least a portion of the electromagnetic radiation propagating into the second layer, wherein the second layer exhibits a second index of refraction to the electromagnetic radiation, and
- wherein the first index of refraction is less than the second index of refraction by an amount that is effective to reduce emission reflection of the electromagnetic radiation incident upon the incident surface by at least 75%, wherein the incident electromagnetic radiation frequency is between 0.3-100 GHz.
An article for attenuating electromagnetic radiation, the article comprising:
- a first layer having a first thickness defined between an incident surface and a transition surface thereof, a first polymer matrix, and a first filler in the first polymer matrix, wherein the electromagnetic radiation exhibits a first wavelength in the first layer, the first thickness being a product of the first wavelength and a destructive interference frequency factor, wherein the destructive interference frequency factor is between 0.2 and 0.3, and the first thickness being between 0.1 and 20 mm;
- and
- a second layer having a first surface disposed at the transition surface of the first layer, the second layer having a second polymer matrix.
Dependencies are inferred from the claim text.