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Record Details

Record 6 of 1854
Electromagnetic scattering by pyramidal and wedge absorber
External Online Source: doi:10.1109/8.7202
Author and Affiliation:
Dewitt, Brian T.(Antenna Research Associates, Inc., Beltsville, MD, United States)
Burnside, Walter D.(Ohio State University, Columbus, United States)
Abstract: Electromagnetic 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.
Publication Date: Jul 01, 1988
Document ID:
19890023991
(Acquired Nov 28, 1995)
Accession Number: 89A11362
Subject Category: COMMUNICATIONS AND RADAR
Document Type: Journal Article
Publication Information: IEEE Transactions on Antennas and Propagation (ISSN 0018-926X); 36; 971-984
Publisher Information: United States
Contract/Grant/Task Num: NSG-1613
Financial Sponsor: NASA; United States
Organization Source: Ohio State Univ.; Columbus, OH, United States
Description: 14p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ANECHOIC CHAMBERS; BACKSCATTERING; ELECTROMAGNETIC ABSORPTION; ELECTROMAGNETIC SCATTERING; GRAZING INCIDENCE; POLARIZATION CHARACTERISTICS; WAVE FRONTS; WEDGES
Imprint And Other Notes: IEEE Transactions on Antennas and Propagation (ISSN 0018-926X), vol. 36, July 1988, p. 971-984. Research supported by Ohio State University.
Miscellaneous Notes: Research supported by Ohio State University
Availability Source: Other Sources
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