The Study on Measurement Error of Strip-line Resonator Method

摘要

High-frequency PCB is widely used in the microwave devices, such as RF circuits and patch antennas. The performance of the PCB is mainly determined by the parameter of complex permittivity. There are many methods to measure the complex permittivity of the PCB. Among these methods, strip-line resonator method is the best test method because of its high accuracy and simple fixture. In order to improve the test accuracy of this method further, this paper consider the influence of the coupling gap, central conductor width, high order modes and surface resistivity by simulated and experimental analysis. The results show that the surface resistivity of the ground has a great impact on the quality factor of the strip-line resonator. So we use the parallel-plate dielectric resonator method to measure the surface resistivity under variable temperature, and then present a new amendments method.