On the shielding effectiveness of enclosures for transient near‐field sources

Abstract

Purpose

The purpose of this paper is to introduce and investigate a useful and practicable definition of the shielding effectiveness (SE) of enclosures for transient near‐field sources.

Design/methodology/approach

The transient SE is defined as the ratio of electromagnetic energies absorbed by an unshielded and by a shielded vanishingly small load. That ratio can be found analytically by means of a suitable spherical‐multipole approach. The SE can be reduced to easily measurable values of frequency‐domain electric and magnetic fields.

Findings

Suitable factors are introduced which depend on the frequency and on the distance between the dipole source and the measurement point inside the shield. The proposed definition has been analytically evaluated and validated for the case of a cylindrical shield.

Originality/value

The paper extends a recently proposed definition of the transient SE for plane‐wave incidence to the case of a dipole near‐field source.

Citation

Möller, C. and Klinkenbusch, L. (2009), "On the shielding effectiveness of enclosures for transient near‐field sources", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 28 No. 1, pp. 22-31. https://doi.org/10.1108/03321640910918832