Dielectric properties of epoxy-dielectrics-carbon black composite for phantom materials at radio frequencies

In order to develop new dry phantom materials that can simulate the effect of electromagnetic wave on human tissues, the dielectric properties of the phantom materials composed of dielectrics, carbon black, and epoxy resin we re investigated. For dielectrics/epoxy composite, the dielectric constants increased with the content of dielectric powder and were independent of fre quency at the measured frequency range. The dielectric constants and conduc tivity of carbon black/epoxy composite also increased with the carbon black , but it showed the frequency dependence that the complex dielectric consta nts decreased with increasing frequency. The dielectric constants and condu ctivity corresponding to human tissues could be obtained by combining the f requency dependence of carbon black/epoxy composite with the dielectric pro perties of dielectrics/epoxy composite and by adjusting the composition rat ios of carbon black, dielectrics, and epoxy. (C) 2000 John Wiley & Sons, In c.