Serrated electromagnetic absorber
AssigneeThe Ohio State University
InventorsRoger C. Rudduck, Walter D. Burnside, Chang-Fa Yang
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Abstract
Electromagnetic absorber having serrations on a surface or surfaces thereof to reduce reflectivity of incident electromagnetic waves thereon. The serrations form a plurality of fins, the height of adjacent fins being spaced by a small distance. Preferably the total absorber wedge height is greater than about 1 wavelength at the lowest design frequency and the height between the serration tips is less than 1/4 wavelength at the lowest design frequency.
Claims20
An electromagnetic absorber having a geometrical configuration comprising a plurality of surfaces, at least one of said surfaces having formed thereon a plurality of serrations defining a plurality of fins projecting from said at least one surface, the difference in height between adjacent fins being less than 1/4 freespace wavelengths at the lowest design frequency for reducing the reflection of incident electromagnetic waves from said absorber.
An anechoic chamber for providing an environment simulating that of freespace, wherein the interior surfaces of said chamber are lined with a plurality of electromagnetic absorbers each having a geometrical configuration comprising a plurality of surfaces, at least one of said surfaces having formed thereon a plurality of serrations defining a plurality of fins projecting from said at least one surface, the difference in height between adjacent fins being less than 1/4 freespace wavelengths at the lowest design frequency for reducing the reflection of incident electromagnetic waves from said absorber.
A method of reducing the reflectivity of incident electromagnetic waves on an electromagnetic absorber, comprising providing a plurality of serrations on at least one surface of said absorber such that said serrations define a plurality of fins projecting from said at least one surface, the difference in height between adjacent fins being less than 1/4 freespace wavelengths at the lowest design frequency.
Dependencies are inferred from the claim text.