Microprocessor-Based Microwave Dielectric Measurement of Liquids by Waveguide Plunger Technique

The measurement of the dielectric permittivity (e‘) and loss (e“) of liquids at microwave frequencies (4–36 GHz) by the waveguide plunger technique is automated with the help of a single-board microcomputer, based on the Intel 8085 microprocessor. Both the data acquisition and analysis using curve-fitting technique are implemented in this stand-alone dedicated system. Measurements were made with some pure standard liquids, dilute solutions, and compared with literature values. © 1985 IEEE