A NEW AUTOMATED WAVEGUIDE SYSTEM FOR THE PRECISE MEASUREMENT OF COMPLEX PERMITTIVITY OF LOW-TO-HIGH-LOSS LIQUIDS AT MICROWAVE FREQUENCIES

摘要

An automated measuring system is described which enables the complex microwave permittivity of liquids to be determined at particular frequencies. A special cell design offers the possibility of precisely measuring a range of liquids from low to high loss. Constructional details of the sample cell are presented together with a system diagram of the microwave apparatus and a description of the analysis of primary data. Possible experimental errors are considered and results for measurements in the XN- and Ku-waveguide bands (5.3-8.4 and 12.5-18 GHz) are discussed. [References: 14]