W-Band Sensor for Complex Permittivity Measurements of Rod Shaped Samples

A novel W-band sensor for complex permittivity measurements of rod shaped samples based on reflectometer method is described. Characterization dielectric materials around 100 GHz quite a challenge. The main limitation the requirements accuracy dimensions test sample and ensuring good contact with conductive surfaces. From this point view, it seems interesting to use cylindrical waveguide TE 01 mode. four linearly-polarized H xmlns:xlink="http://www.w3.org/1999/xlink">10 fields rectangular waveguides equal amplitude phase circumnavigate jointly excite its xmlns:xlink="http://www.w3.org/1999/xlink">nm circular modes four-fold symmetry. This precludes excitation lower-order metallic waveguide. mode unique in that field leads zero surface walls interaction takes place surface. calibration uses curves obtained by simulation known values samples. eliminates requirement precision standards, which problematic realize at millimeter wavelengths. Moreover, structure makes impossible apply standard method. Simulation using these have been performed (70-114 GHz). Measurement results demonstrate robustness new characterizing