Evaluation of a Novel Tubular Sample Holder for Dielectric Measurements with Abdulnour's Method

This paper assesses the accuracy of a rectangular waveguide pierced by a tubular load sample holder for measuring liquid materials at high temperatures with a formulation based on Abdulnour's method. The measurement technique is derived from the transmission line method. The sample holder is adapted from a section of a rectangular waveguide pierced by a tubular load for high temperature measurements at 2.45 GHz. Simulations of the loaded sample holder are carried out with CST Microwave Studio (R) for several values of sample permittivity. The accuracy of the technique is evaluated by comparing these values to those obtained from Abdulnour's extraction model. It is shown that by properly choosing a set of calibration standards the technique can be quite accurate.