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Electromagnetic scattering by pyramidal and wedge absorberElectromagnetic scattering from pyramidal and wedge absorbers used to line the walls of modern anechoic chambers is measured and compared with theoretically predicted values. The theoretical performance for various angles of incidence is studied. It is shown that a pyramidal absorber scatters electromagnetic energy more as a random rough surface does. The apparent reflection coefficient from an absorber wall illuminated by a plane wave can be much less than the normal absorber specifications quoted by the manufacturer. For angles near grazing incidence, pyramidal absorbers give a large backscattered field from the pyramid side-faces or edges. The wedge absorber was found to give small backscattered fields for near-grazing incidence. Based on this study, some new guidelines for the design of anechoic chambers are advocated because the specular scattering models used at present do not appear valid for pyramids that are large compared to the wavelength.
Document ID
19890023991
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Dewitt, Brian T.
(Antenna Research Associates, Inc. Beltsville, MD, United States)
Burnside, Walter D.
(Ohio State University Columbus, United States)
Date Acquired
August 13, 2013
Publication Date
July 1, 1988
Publication Information
Publication: IEEE Transactions on Antennas and Propagation
Volume: 36
ISSN: 0018-926X
Subject Category
Communications And Radar
Accession Number
89A11362
Funding Number(s)
CONTRACT_GRANT: NSG-1613
Distribution Limits
Public
Copyright
Other

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