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Shielding Effectiveness Theory of Shielding

  • George M. Kunkel
Chapter

Abstract

The hypothesis upon which the present accepted theory of shielding consisting of the equation SE = R + A + B is based is presented. The hypothesis is based on wave theory and the analogy between transmission lines and the penetration of a wave through a barrier. A detailed analysis, comparing the value of the current delivered to a load impedance using circuit theory and wave theory, is conducted. The results of the analysis illustrate that for wave theory to provide accurate results, specific boundary conditions must be met. This leads to the conclusion that wave theory is only a theory and the hypothesis upon which the present accepted theory of shielding is invalid. This leads to the conclusion that the present accepted theory of shielding yields inaccurate results.

Keywords

Shielding effectiveness Reflective loss Absorption loss Re-reflection coefficient Shielding theory Shielding practice Wave theory Circuit theory E field shielding H field shielding 

References

  1. 1.
    Kunkel G (2018) Testing of EMI gaskets. Evaluation Engineering MagazineGoogle Scholar
  2. 2.
    Frederick Research Corp (1962) Handbook of radio frequency interference, vol 3 (Methods of Electromagnetic Interference Suppression). Frederick Research Corp., Wheaton, MDGoogle Scholar

Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  • George M. Kunkel
    • 1
  1. 1.Spira Manufacturing CorporationSan FernandoUSA

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