Accession Number : ADA115187

Title :   Optimal Application of Multilayer Shielding for Maximal EM Field Attenuation.

Descriptive Note : Final rept.,


Personal Author(s) : Yang,F C ; Lee,K S H

PDF Url : ADA115187

Report Date : Apr 1982

Pagination or Media Count : 114

Abstract : A two-surface cable shield periodic bondings and with either discrete or distributed excitation is analyzed. It is found that the bondings improve the overall shielding effectiveness of the cable shield at certain frequencies, but degrade the shielding at others. Certain criteria are established for better shielding. In the case of distributed excitation, the overall effective transfer functions of a two-surface cable shield can be calculated from simple circuits. These circuits can be extended for multisurface cable shields. Part II extends the previous work on a single-surface shielded enclosure of arbitrary shape to a multisurface enclosure with or without electrical bonding between the shields. It is found that the inductive mutual interactions among the shields and the bonding straps reduce the effectiveness of a multisurface shielded enclosure against the penetration of external magnetic fields. (Author)

Descriptors :   *Electromagnetic fields, *Attenuation, *Shielding, Optimization, Layers, Electrical properties, Bonding, Magnetic fields, Cables, Circuits, Transfer functions, Straps, Distribution, Excitation

Subject Categories : Electrical and Electronic Equipment
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE