Dielectric properties of Sphenarium purpurascens at 2.4 GHz

Abstract

The dielectric properties of edible grasshoppers (Sphenarium purpurascens) are presented at 2.4 GHz using the cavity perturbation technique. The samples are subjected to increasing temperatures (from 25 to 80 °C). It will be shown that the real part of the permittivity has a decreasing trend to rising temperature. As temperature increases, water evaporates; therefore the value of permittivity decreases. Moreover, dielectric losses increase with increasing temperature from 16 at 25 °C to 32 at 80 °C. This is caused by a predominant ionic conduction at lower frequencies, where ionic mobility increases at higher temperatures. In addition, the penetration depth decreases from 10.8 mm at 25 °C to 3.5 mm at 80 °C.

Keywords:

• Edible insects
• Sphenarium purpurascens
• dielectric properties