The Improvement of Open Resonator Method for Dielectric Measurement at Millimeter Wavelengths

An open resonator system is designed and constructed for the accurate measurement of complex permittivity at Ka band.It is solved successfully that how to obtain the accurate cavity length over a broad band,how to determinate the unique permittivity,how to complete the systematic error analysis and how to check a measurement system.The error analysis shows that the relative standard deviation of the measurement system is less than 0.17% for permittivity and 20.4% for loss tangent.Software that is developed to controls the system improves the measurement efficiency greatly.