New Methods for Measurement of Complex Permittivity up to 13 GHz and their Application to the Study of Dielectric Relaxation of Polar Liquids Including Aqueous solutions

High frequency dielectric measurements, until recently the exclusive prerogative of point‐by‐point frequency domain methods, can now be made with very reasonable precision in the time domain. These novel methods which are an extension of the earlier reported Time Domain Reflectometry technique yield dielectric information over a range equivalent in frequency to about 10 MHz to 13 GHz. The theoretical basis of these methods is given and their accuracy demonstrated by reference to measurements on water and ethanol. An example of their application to aqueous systems is also given.