Sensing of dielectric property alterations in biological tissues at microwave frequencies

In this paper, testing of an open ended spiral resonator for electrical property retrieval of biological tissues is presented. A spiral open ended resonator operating at 630 MHz when placed on human skin is tested with high water content phantoms. Phantoms are prepared by mixing water and flour and adding 5%, 10%, 15%, 20%, 25%, 30% sugar to the mixture. To collect reference data, electrical properties of the phantoms are measured in advance with Agilent 85070 high temperature dielectric probe kit. Response of the structure is collected by placing the phantoms on top. Trough the S-parameter measurements the electrical properties of the phantoms are retrieved and the results are compared with the collected reference data.