Dielectric Properties of Frozen Surimi at 915 MHz and 2450 MHz

Abstract

Dielectric properties of two types of unsalted frozen surimi (SA grade made on shipboard and K grade made in onshore plants) at 2450 MHz and 915 MHz were measured from -30°C to 30°C by the open-ended coaxial probe method. The values of dielectric constant and loss factor varied with temperature, being very small at low temperatures, whereas above the freezing point the values increased rapidly. Penetration depths which were calculated from the dielectric constant and loss factor also varied with temperature. Moreover, there was no difference in the dielectric constant or loss factor of the two kinds of surimi below the freezing point; there was a difference in the dielectric constant above the freezing point, however, due to the difference in moisture content of the surimi.