Characterization of the Q-factor of resonator for dielectric measurements
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摘要: 对同轴线-集中电容负载谐振腔, 采用传输测量使用的3dB 三频法决定有载Ql, 计及谐振频率下的插入损耗后获得无载Qu, 对同一腔体, 也用单端口反射测量技术的xdB 三频法, 并通过测量回程损耗在谐振点和xdB 点的输入反射系数振幅来获得无载Qu. 在500MHz 下40 个不同的耦合状况下, 两种方法得到无载Qu的算术平均值和标准差为2519±34. 这两种技术被用来调节和实现传输型谐振腔的输入、输出的等耦合和电介质测量, 本文从介质损耗测量的观点讨论了如何使用有载Ql和无载Qu.Abstract: The transmission-type measurement of the Q-factor of a reentrant cavity is used to determine unloaded Qu from the measured loaded Ql by the 3 dB three frequencies method together with insertion loss at the maximum output. Also, the one-port reflection technique is used to determine unloaded Qu from the resonant frequency and the bandwidth measured at the xdB point, as well as the magnitudes of the input reflection coefficient measured at both resonant frequency and xdB return loss for the same reentrant cavity. The arithmetic mean Qu was evaluated to be 2519±34 tested under the 40 various couplings at frequency 500 MHz by using transmission and reflection techniques. Finally, these techniques are applied to the realization and tuning of that the input and output couplings are identical to each other for a transmission-mode resonator. Meanwhile, the selection of Q-factor values in measurements of complex permittivity of dielectric materials is discussed.
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Key words:
- Cavity resonator /
- Q-factor measurement /
- Dielectric measurement
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