Summary
International Symposium on Electromagnetic Compatibility
2009
Session Number:21R3
Session:
Number:21R3-2
A Novel Method of Electric Field Estimation by Using Spherical Dielectric Scatterer
T. Komakine, T. Kurosawa, H. Inoue,
pp.173-176
Publication Date:2009/7/20
Online ISSN:2188-5079
Summary:
To evaluate the noise source of electric equipment, the magnetic near field is often measured practically. The EMC rule, however, regulates generally the limited field strength in far electric field. In the case, the far electric field strength is not always corresponding to the magnetic near field strength because of the complex transmission function from the source to the receiving antenna. The authors have been developing the new electromagnetic field measurement system based on the Modulated Scattering Technique (MST) in order to map the radiated noise distribution. A dielectric sphere is used as the scatterer instead of a conventional metallic dipole element to improve the field invasiveness and to obtain the isotropic polarization for the incident wave. In this paper, the scattered electric field by the dielectric sphere on the MST system was theoretically investigated to confirm the factors that control the measurement sensitivity. The calculated result showed that the dielectric scatterer could generate enough power to detect and agreed with the result of the experimental measurement. The investigation showed that the scatterer volume, the MST modulation ratio, and the scattering efficiency corresponding to the permittivity of the dielectric, controlled the measurement sensitivity of the system.