Permittivity and Measurements

Abstract

This article provides an overview of the dielectric properties of food, agricultural products, biological tissues, resins, plastics, ceramics, soils, and wood at radio and microwave frequencies. The influence of three main factors, namely, microwave frequency, temperature, and material moisture contents, on complex dielectric properties of lossy materials is analyzed. The most popular measurement techniques, such as the open-ended coaxial probe method, transmission line method, and perturbation method, are described. Relevant dielectric property data are provided in tables and figures.