Permittivity measurements on low and medium loss liquids using a terminated coaxial line

Abstract

A method is given for measuring the complex permittivity of a liquid contained in a short-circuited line. Basically, the technique consists of plotting a standing wave pattern and comparing this with the theoretically predicted waveform. This is an improvement on previous methods in that the dielectric properties of a lossy liquid with poorly defined maxima and minima can be investigated; moreover, a liquid with a low permittivity and a first minimum lying outside the range of measurement can be examined.