Composite electromagnetic wave absorber made of soft magnetic material and polystyrene resin and control of permeability and permittivity
✍ Scribed by Kenji Sakai; Norizumi Asano; Yoichi Wada; Shinzo Yoshikado
- Book ID
- 104023150
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 326 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0955-2219
No coin nor oath required. For personal study only.
✦ Synopsis
The frequency dependences of the relative complex permeability μ * r , the relative complex permittivity ε * r and the absorption characteristics for composite electromagnetic wave absorbers made of polystyrene resin and sendust particles or permalloy particles were investigated in the frequency range from 1 to 40 GHz. The size of sendust particles was varied between approximately 5 and 20 m and the particle size dependence of μ * r was observed. The value of μ * r was shown to be controlled by adjusting the particle size of sendust, and an electromagnetic wave absorber with a flexible design was proposed. A metal-backed single-layer absorber made of sendust particles or permalloy particles absorbed more than 99% of electromagnetic wave power at frequencies above 20 GHz. In addition, a composite made of 5 m particles exhibited a return loss of less than -20 dB in the frequency range of not only several GHz but also above 30 GHz.