International Comparison of Complex Permittivity Measurement at 9 GHz

Dielectric constant and loss measurements made by three government laboratories (of the USSR, Canada, and the U. S. A.) are compared. The two materials measured were glasses. The measurements utilized cavity resonators in the H01n mode. The errors in dielectric constant reported by the laboratories were usually ± 0.3 percent; actual differences between laboratories of the average corrected results were only ± 0.05 percent. The loss tangent results disagreed when multimoding occurred; however, the errors may be as low as ± 0.00002 or ± 3 percent, whichever is the larger, if multimoding is avoided.