Improvement of Electrical Properties of High-Hydrous Gel Phantom at Low Frequency Band Using Activated Carbon Fiber

Abstract

High-hydrous gel phantom simulating the electrical properties of living body (relative permittivity, conductivity) is used, such as to evaluate the biological effect by the communication equipment. However, it is necessary to improve the electric properties of the phantoms in order to use in low frequency bands. In previous studies, the addition of carbon fiber to the phantom causes interfacial polarization and improves electrical properties in the low frequency band. Non-uniformity of the phantom, however, increases with the increase in carbon fiber amount, leading to a decrease in reproducibility. In this paper, we investigated to reduce the amount of inductive material and improve electrical properties in the low frequency band by adding activated carbon fiber with a large surface area instead of carbon fiber. As a result, although a large surface area was effective in the dielectric relaxation frequency, conductivity increased due to the conductivity of activated carbon fiber.