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Estimation of the electric parameters of thin electromagnetic shielding materials
Author(s) -
Nagano Isamu,
Yoshimura Yoshiyuki,
Yagitani Satoshi,
Yokomoto Hiroaki,
Tosaka Toshihide,
Nakayabu Toshihiro
Publication year - 2004
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.10273
Subject(s) - electromagnetic shielding , electric field , measure (data warehouse) , dipole , computational physics , shielding effect , magnetic dipole , magnetic field , materials science , acoustics , physics , computer science , composite material , quantum mechanics , database
It is important to know the electric parameters of the shielding material for numerical analysis. The purpose of this report is to estimate electric parameters of thin shielding materials. The electromagnetic field in the vicinity of a horizontal multilayered material with a magnetic dipole source is calculated numerically by a Sommerfeld integral. On the basis of this calculation, we develop a “shielding box” for measuring the shielding effectiveness ( SE ) with little error. We compare the magnetic SE measured with the shielding box with that obtained by calculation to evaluate this method. Because calculation results are in good agreement with measurement results, we confirm that we can measure magnetic SE of thin shielding materials with this system. Next, we propose a method to estimate unknown electric parameters of shielding materials by using the SE measurement system and the numerical calculation. The electric parameters are derived by iterating numerical calculations to fit the experimental results within 1‐dB error. We estimated the electric parameters of A1 (aluminum) material. Fitted results are in good agreement with the well‐known values, demonstrating the validity of the developed method. © 2004 Wiley Periodicals, Inc. Electr Eng Jpn, 147(1): 1–9, 2004; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.10273