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Analysis of hybrid EM wave absorber using thin corrugated dielectric lossy sheet based on equivalent permittivity representation
Author(s) -
Saito Toshifumi,
Kurihara Hiroshi,
Nishikata Atsuhiro,
Kasabou Miki,
Sugahara Toru,
Matsumura Kazuya
Publication year - 2009
Publication title -
electronics and communications in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.131
H-Index - 13
eISSN - 1942-9541
pISSN - 1942-9533
DOI - 10.1002/ecj.10082
Subject(s) - materials science , lossy compression , permittivity , dielectric , capacitance , equivalent circuit , relative permittivity , optics , wavelength , optoelectronics , physics , mathematics , electrical engineering , engineering , electrode , quantum mechanics , voltage , statistics
The 10‐m and 3‐m semianechoic chambers are in widespread use for the electromagnetic compatibility (EMC). The hybrid EM wave absorber consisting of the sintered ferrite tiles and the dielectric lossy materials has been usually used for these semianechoic chambers. In the past, Suetake, Naito, and Shimizu's studies played a key part in providing the basis for the hybrid EM wave absorber. The reflectivity of the hybrid EM wave absorber can be calculated from the multilayered approximate structure. In particular, each layer occupied partly by the dielectric lossy materials can be replaced by the homogeneous plate having the equivalent relative complex permittivity, which is determined through the synthesized capacitance model in the large wavelength range. But, there was a problem that the equivalent relative complex permittivity differs with the process of the synthesized capacitance model. We propose a new method which can be applied to the equivalent relative complex permittivity by the finite difference method (FDM). Moreover, the reflectivity of the hybrid EM wave absorber using the thin corrugated dielectric lossy sheet is calculated and measured. As a result, it is confirmed that the measured reflectivity agrees with the calculation one. © 2009 Wiley Periodicals, Inc. Electron Comm Jpn, 92(7): 12–20, 2009; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/ecj.10082