Rebecca J Schultz

US Patent:

20140259639, Sep 18, 2014

Filed:

Jun 29, 2012

Appl. No.:

13/539066

Inventors:

Kathleen C. Maloney - Marietta GA, US
James G. Maloney - Marietta GA, US
Rebecca B. Schultz - Alpharetta GA, US
John W. Schultz - Alpharetta GA, US

International Classification:

H05K 9/00

US Classification:

296021

Abstract:

An electromagnetic chamber absorber provided improved absorption across a wideband and both lower diffuse and specular scatter and a method for constructing the same. An exemplary device can compromise a periodic arrangement of disconnected electromagnetically lossy elements where the periodicity of the lattice is adjusted to suppress all or most grating lobe scattering. Because the electromagnetically lossy elements are disconnected, scalable manufacturing approaches are enabled. The lossy elements can be easily fabricated via shaping, which includes rolling, folding and cutting resistive and/or magnetic sheet materials. The lossy elements can be repeatably placed in a periodic lattice using low density scaffolding approaches and/or other alignment mechanisms. The absorption at the lower frequency part of the electromagnetic bands (below 1-2 GHz) can be improved via the addition of parallel lossy sheets into the low-density scaffolding.