Accession Number : AD0651385

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

Descriptive Note : Research rept.,

Corporate Author : NAVY UNDERWATER SOUND LAB NEW LONDON CONN

Personal Author(s) : Ryan,Cornelius M.

Report Date : 17 MAR 1967

Pagination or Media Count : 31

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)

Descriptors :   (*ELECTROMAGNETIC SHIELDING, EFFECTIVENESS), PREDICTIONS, ELECTROMAGNETIC COMPATIBILITY, ALUMINUM ALLOYS, COPPER, STEEL, COMPUTER PROGRAMS, LOW FREQUENCY, VERY LOW FREQUENCY

Subject Categories : Electrical and Electronic Equipment
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE