Dielectric properties of raw Aster tataricus and its residue of decoction

Abstract

The plant Aster tataricus is widely used in traditional Chinese medicine to relieve cough-related illnesses. In this work, the dielectric properties of Aster tataricus were studied in terms of dielectric constant (ε’), dielectric loss factor (ε”), and electrical conductivity (σ). A Hioki IM3570 impedance analyser and an Agilent E5071C ENA series vector network analyser were used for the impedance and dielectric measurement, respectively. The dielectric properties were investigated from 12.5 kHz to 5 MHz and 50 MHz to 20GHz. All the measurements were conducted at room temperature. Aster tataricus were dried and ground into powder for preparation of pellets before and after decoction. It can be noticed that the variation of measured dielectric constant, dielectric loss factor, and electrical conductivity are significant over frequency.