Electric Dipole Equations in Very Near Field Conditions for Electromagnetic Shielding Assessment. Part I: Radiation Equations


The problem of a correct modeling of the electromagnetic field distribution in the near field region is one of the most challenging and interesting due to its direct implication in the engineering evaluation of the shielding effectiveness of materials and structures in close proximity of radiating sources. This paper deals with a detailed analysis on the applicability of the Schelkunoff theory of transmission lines for shielding assessment in near field. The contribution is divided in two Parts. The present Part I analyzes the characteristics of two principal closed form set of equations for the quick evaluation of the near field from an electric dipole. It discusses their assumptions and compares the values of electric (E) and magnetic (H) fields, and their statistics, with those coming from accurate three-dimensional full waves simulations considered as reference. The computed E and H are the input for Part II where the wave impedance and the reflection, transmission, and shielding effectiveness coefficients are computed and discussed.


Electrical and Computer Engineering

Keywords and Phrases

Electromagnetic Fields; Magnetic Shielding; Shielding; Close Proximity; Electromagnetic Field Distribution; Engineering Evaluations; Near Field Region; Radiating Sources; Shielding Effectiveness; Very Near Fields; Wave Impedances; Electromagnetic Shielding; Attenuation; Electric Dipole; Lossy Materials; Near Field (NF); Reflection; Wave Impedance

International Standard Serial Number (ISSN)

0018-9375; 1558-187X

Document Type

Article - Journal

Document Version


File Type





© 2017 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Aug 2017