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FDTD method for site attenuation analysis of compact anechoic chamber using large‐cell concept
Author(s) -
Kawabata Masato,
Ishida Yasuhiro,
Shimada Kazuo,
Kuwabara Nobuo
Publication year - 2008
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.20411
Subject(s) - anechoic chamber , attenuation , finite difference time domain method , acoustics , optics , dipole antenna , dielectric , attenuation coefficient , antenna (radio) , dipole , materials science , method of moments (probability theory) , computational physics , physics , electrical engineering , engineering , mathematics , optoelectronics , statistics , quantum mechanics , estimator
In this paper, the FDTD method has been applied to analyze the site attenuation of an anechoic chamber at 100 MHz or less where the ray tracing method is not applicable. To calculate site attenuation by a personal computer, the dipole antenna and the EM absorber were modeled using a large cell which was larger than the diameter of the antenna element and the thickness of the EM absorber. The equivalent diameter of the antenna element was determined so that the calculated site attenuation in free space agreed with that by the method of moments, and the equivalent dielectric constant and permeability of the absorber were determined so that the reflection coefficient agreed with that by the transmission theory. The site attenuation of the compact anechoic chamber was calculated for frequencies from 30 MHz to 100 MHz and compared with the measured one to confirm the validity of the proposed modeling method. The results indicated that the deviation between the calculated values and the measured ones was within 2 dB. © 2007 Wiley Periodicals, Inc. Electr Eng Jpn, 162(4): 9–16, 2008; Published online in Wiley InterScience ( www.interscience. wiley.com ). DOI 10.1002/eej.20411