In Vitro Impedance of Biological Tissues in the Frequency Range 0.1 to 1.3 GHz

Abstract

In vitro impedance of all important organ tissues of albino rats is presented to help understand the mode of electromagnetic energy absorption in biological systems. Measurements of transmission loss, the associated phase shift and loss tangent have been carried out in the frequency range 100 - 1300 MHz in a semi-infinite set up with a suitably designed coaxial cell. Values of equivalent capacitance and conductance of different in vitro biological tissues at 900 MHz are also presented. The results show that for all the organs the impedance decreases whereas its phase angle increases with increase of frequencies. For high water content tissues, loss tangent is found to be higher compared to low water content tissues, though the transmission loss remains almost constant.