A COMPUTER EXPRESSION FOR PREDICTING SHIELDING EFFECTIVENESS FOR THE LOW FREQUENCY PLANE SHIELD CASE.

Abstract

A computer expression for predicting the shielding effectiveness of an infinite plane shield has been developed for low frequencies (below 50 kHz). It is shown that this expression, which arises as a special case of the solution of the general wave equation, is a sum of the attenuation term of Schelkunoff's transmission theory and a remainder, which is in integral but calculable form. The computed results are in excellent agreement with values obtained experimentally for aluminum, copper, and steel. Application to cases involving highly ferromagnetic materials is hampered by difficulties in determining permeability and its dependence on frequency and field strength. (Author)

Document Details

Document Type
Technical Report
Publication Date
Mar 17, 1967
Accession Number
AD0651385

Entities

People

  • Cornelius M. Ryan

Organizations

  • Navy Underwater Sound Laboratory

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Agreements
  • Aluminum
  • Attenuation
  • Computers
  • Equations
  • Ferromagnetic Materials
  • Frequency
  • Integrals
  • Materials
  • Mathematics
  • Permeability
  • Shielding
  • Wave Equations

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering