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Development of the Electromagnetic Absorption
Materials
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Takeshi TOYODA, Kaduichi KITAGAWA, Yoshiyuki YOSHIMURA and Kazuo
YAMANA
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For the purpose of developing multi-layered electromagnetic wave-absorber
by using carbon fiber textile, a series of absorbers laminated by orthoblends
textile was designed and evaluated in GHz frequency. A large Reflection
Loss (R.L.) in the matching frequency was detected in the case of l/4-type
wave absorber utilizing the orthoblends textile containing 20 mass% carbon
fiber with the conducting property as a resistant film. It was revealed
that the multi-layered wave-absorber consisting of magnetic material sandwiched
between orthoblends textile and carbon fiber textile had absorption properties
superior to those of the mono-layer absorber. The material design was
performed by the transmission line theory using permittivity and permeability
obtained by the S-parameter method. The simulation analysis suggested
that the electromagnetic wave-absorber of 5.7 mm in thickness with matching
frequency of 6.7GHz can be designed.
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Keywords ■■■ |
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the electromagnetic wave absorber,
ferrite, S-parameter, material constant |
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