Permittivity Measurements Utilizing the Dielectric Post in Waveguide Technique

摘要

This report describes experimental procedures and computer codes for the measurement of the permittivity of filamentary high loss materials by the dielectric post-in-waveguide (DPW) technique. This method is especially useful in characterizing the microwave/millimeter wave dielectric properties of materials such as partially graphitized carbon fibers, linear chain crystals, superionic conductors, ferroelectrics, etc. This method allows the complex permittivity, to be measured on a pointwise continuous frequency basis across a rectangular waveguide band. We have employed and will describe two measurement setups; for X and Ku band studies we have collected data with commercial automated vector network analyzers, for K and Ka bands we have assembled transmission phase bridges using standard waveguide components and a scalar network analyzer. The computer codes developed for this work are described in detail and selected programs and subroutines are listed in the appendix.