Wave Absorber Formed by Arranging Cylindrical Bars at Intervals for Installing between ETC Lanes

Kouta MATSUMOTO
Takeru OZAWA
Takuya NAKAMURA
Takahiro AOYAGI
Osamu HASHIMOTO
Takashi MIYAMOTO

Publication
IEICE TRANSACTIONS on Electronics   Vol.E89-C    No.11    pp.1700-1703
Publication Date: 2006/11/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.11.1700
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Electromagnetic Theory
Keyword: 
wave absorber,  cylindrical bars,  ETC,  FI method,  

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Summary: 
The wave absorber which is formed by arranging cylindrical bars periodically composed of magnetic loss material and metallic bars is proposed for improving ETC environment, and characteristics of reflection loss and shielding effect are analyzed and measured. As a result, the change of various characteristics can be confirmed quantitatively by changing the thickness of magnetic loss material covering around a metallic bar and the pitch interval between bars. Furthermore, it is clarified that reflection loss of -9 dB and shielding effect of -25 dB are obtained at 5.8 GHz when the covering thickness of material is 1.5 mm and the pitch interval is 16.0 mm. Therefore, the wave absorber formed by arranging cylindrical bars that satisfies various characteristics required for the improvement of ETC environment can be realized.