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Ferrite grid electromagnetic wave absorbers

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4 Author(s)
Naito, Yoshiyuki ; Dept. of Phys. Electron., Tokyo Inst. of Technol., Meguro-ku, Tokyo, Japan ; Anzai, H. ; Mizumoto, T. ; Takahashi, Michiharu

The wideband characteristic of a novel ferrite grid electromagnetic wave absorber is presented. Calculation shows that the grid absorber suppresses reflection ⩽-20 dB from 30 to 700 MHz, and ⩽-15 dB up to 1000 MHz. It is shown that an RF anechoic chamber fitted with the grid absorber satisfies the FCC standard. By combining the grid structure with appropriate rubber ferrite and low-permittivity dielectric layers, its bandwidth becomes much wider (from 30 to 1700 MHz for ⩽-20 dB). It is also shown that the thickness of lossy dielectric required for suppressing reflection at any frequency above 30 MHz can be greatly reduced by using the grid structure

Published in:

Electromagnetic Compatibility, 1993. Symposium Record., 1993 IEEE International Symposium on

Date of Conference:

9-13 Aug 1993