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http://dx.doi.org/10.6109/jkiice.2018.22.7.1015

A simple Q measurement method of a lossy coupled cavity resonator  

Han, Dae-Hyun (Department of Electronic Engineering, Dong-eui University)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.22, no.7, 2018 , pp. 1015-1020 More about this Journal
Abstract
The cavity resonator is one of the widely used components in the microwave applications. The unloaded Q, the resonant frequency, and the coupling factor are basic parameters of a cavity. A simple unloaded Q factor measurement procedure of a cavity is proposed in a lossy coupling. The equivalent circuit of a cavity with coupling loss at near the resonant frequency is presented. The coupling loss resistance was found by the measurement of a cavity impedance. The cavity impedance compensated coupling loss was redrawn on the Smith Chart. The loaded Q and coupling factor were obtained based on the compensated impedance locus and then the unloaded Q factor was calculated. To verify the proposed procedure, the cavity with lossless coupling was measured. The two measurement results in the lossy and lossless coupling agree well. The results confirm the proposed procedure is valid.
Keywords
cavity; lossy coupling; network analyzer; Smith Chart; unloaded Q;
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Times Cited By KSCI : 1  (Citation Analysis)
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