Abstract
For the purpose of designing electromagnetic wave absorbers which can operate at frequencies above 1 GHz, the ability to control the relative complex permeability μ* r and the relative complex permittivity ε* r for the composite made of fine metal particles dispersed in polystyrene resin was investigated. Method to calculate μ* r for sample made of dispersed metal particles having the distribution of the size is proposed. In order to clarify the effect of particle shape on μ* r and ε* r, samples made of dispersed non-spherical aluminium particles in polystyrene resin were prepared and the values of μ* r and ε* r were compared. Moreover, in order to clarify the effect of particle size on μ* r and ε* r, samples made of dispersed spherical particles of copper with the size of several micro meters were prepared. The calculated value of μ* r using the proposed formula considering the size distribution was more in agreement with the measure value compared with that calculated using formula applicable to single particle size. Proposed formula was also applicable to calculation of μ* r with multiple kinds of average particle size. Moreover, the calculated value of μ* r was qualitatively in agreement with the measured value for the samples with different shape or size. The measured values of μ* r for the composite made of the mixture of copper particles with two kinds of average particle size were in agreement with the calculated values. Thus, it was found that the values of μ* r and absorption characteristics can be controlled by the particle size distribution, the particle shape, or mixing ratio of particles with different average particle size.
| Original language | English |
|---|---|
| Pages (from-to) | 404-410 |
| Number of pages | 7 |
| Journal | Progress in Electromagnetics Research Symposium |
| Publication status | Published - Dec 26 2011 |
| Externally published | Yes |
| Event | Progress in Electromagnetics Research Symposium, PIERS 2011 Marrakesh - Marrakesh, Morocco Duration: Mar 20 2011 → Mar 23 2011 |
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Electronic, Optical and Magnetic Materials