Serrated electromagnetic absorber
First Claim
1. 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.
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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.
55 Citations
20 Claims
- 1. 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.
- 6. 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.
- 11. 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.
Specification