Realization of 3 m Semi Anechoic Chamber by Using Hybrid EM Wave Absorber Consisting of Composite Magnetic Material

Hiroshi KURIHARA
Motonari YANAGAWA
Yoshikazu SUZUKI
Toshifumi SAITO

Publication
IEICE TRANSACTIONS on Electronics   Vol.E89-C    No.1    pp.69-71
Publication Date: 2006/01/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.1.69
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Section on Near-Field and Far-Field Electromagnetic Absorption and Shielding and Related Technologies)
Category: 
Keyword: 
hybrid EM wave absorber,  composite magnetic material,  nonflammable,  3 m semi anechoic chamber,  normalized site attenuation,  

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Summary: 
This letter proposes the thinnest hybrid EM wave absorber using a composite magnetic material, which can be applied to the 3 m semi anechoic chambers. We experimentally designed a new hybrid EM wave absorber of the wedge shape, which was made from the ferrite powder, the inorganic fiber and binder. As a result, the length of this absorber could be realized only 6 cm, which was ascertained having the nonflammable. The 3 m semi anechoic chamber is constructed in the size of L9 mW6 mH5.7 m using this absorber, and then the site attenuation is measured according to ANSI C63.4 in the frequency range of 30 MHz-1 GHz. As a result, the measured normalized site attenuation is obtained within 3 dB to the theoretical normalized site attenuation.