Uncertainty analysis of Q‑factor measurement in cavity resonator method by electromagnetic simulation

摘要

Effects of cavity material on the Q-factor measurement of microwave dielectric materials were studied by HFSS simulationand the measurements using metal cavity. TE_(01δ) mode resonant frequency was determined from the electric andmagnetic field patterns and the Q-factor was calculated from the 3 dB bandwidth of resonant peak at the scatteringmatrix S_(21) spectrum. In the cavity resonator method, Cu metal cavity has been generally used. However, the oxidizedsurface of Cu cavity could generate errors in Q-factor measurements. From the simulation, it is observed that the Q-factorsignificantly decreased with decreasing conductivity of cavity metal. When the conductivity of the oxidized Cu is assumedas 1000 Ω~(−1) m~(−1), the Q-factor could be decreased by 80% compared to pure Cu.