Investigation on 10 m Semi Anechoic Chamber by Using Grid-Ferrite and Open-Top Hollow Pyramidal EM Wave Absorber

Hiroshi KURIHARA  Toshifumi SAITO  Yoshikazu SUZUKI  Kouji NAGATA  Masaharu ADACHI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E89-C   No.1   pp.16-23
Publication Date: 2006/01/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.1.16
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Near-Field and Far-Field Electromagnetic Absorption and Shielding and Related Technologies)
Category: 
Keyword: 
10 m semi anechoic chamber,  hybrid EM wave absorber,  grid-ferrite,  site attenuation,  ray-tracing method,  broadband calculable dipole antenna,  

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Summary: 
This paper investigates the 10 m semi anechoic chamber using a new type hybrid EM wave absorber consisted of the grid-ferrite and the open-top hollow pyramidal EM wave absorber. We designed a new type hybrid EM wave absorber, which length could be slightly realized 65 cm. The 10 m semi anechoic chamber was constructed in the size of L21.5 mW13.5 mH8.9 m as the result of the ray-tracing simulation using this absorber. Then, the site attenuation in the constructed anechoic chamber was measured by using the broadband calculable dipole antennas. As the result, the maximum deviations between the measured site attenuation and theoretical calculated one were obtained within 3.6 dB in the frequency range of 30 MHz to 300 MHz. It was confirmed the validity of a new type hybrid EM wave absorber. Moreover, it was confirmed that the measured results agree with the ray-tracing simulation results, in which the differences are about 1.5 dB.