Dielectric properties of synthetic paste at 2 450 MHz and 915 MHz

Abstract

Synthetic paste has been used as a material for the visualization of temperature distribution in a food heated by microwave. In this investigation, dielectric properties of synthetic paste were measured at 2 450 MHz and 915 MHz from 20°C to 75°C. These values were compared with those of water. The dielectric constant of synthetic paste was slightly smaller than that of water. However, the dielectric loss factor of synthetic paste was larger than that of water. As a result, penetration depth of synthetic paste, the distance where the electric power is decreased to 1/e of its surface value, was rather smaller than that of water.