DocumentCode :
1172667
Title :
Accurate and direct characterization of high-Q microwave resonators using one-port measurement
Author :
Chua, Lye Heng ; Mirshekar-Syahkal, Dariush
Author_Institution :
Dept. of Electron. Syst. Eng., Univ. of Essex, Colchester, UK
Volume :
51
Issue :
3
fYear :
2003
fDate :
3/1/2003 12:00:00 AM
Firstpage :
978
Lastpage :
985
Abstract :
An accurate and direct characterization of high-Q microwave resonators using one-port vector network measurement technique is presented. In this characterization, the delay due to the connector between the resonator and network analyzer is first deembedded. The elements of the equivalent-circuit of the resonator are then readily extracted from the experimental data in a straightforward manner without any numerical optimization. The extraction method works very accurately for high-Q resonators coupled to external circuits electrically or magnetically, and can deal with universal cases including external lossy couplings and weak under-coupled resonators. Parameters such as coupling coefficient, loaded quality factor, and loaded resonant frequency can also be directly computed. For the loaded resonant frequency, an original expression is derived in this paper. This paper also provides an approximate relation between the loaded resonant frequency and measured frequency at which the minimum magnitude of the reflection coefficient occurs. The high accuracy of the method is demonstrated with two examples: a hollow cavity resonator and a dielectric loaded cavity resonator, which is also supported by the well-established one-port multipoint technique.
Keywords :
Q-factor; cavity resonators; delays; equivalent circuits; microwave measurement; network analysers; coupling coefficient; delay; dielectric loaded cavity resonator; equivalent-circuit; external lossy couplings; high-Q microwave resonators; hollow cavity resonator; loaded quality factor; loaded resonant frequency; one-port measurement; one-port multipoint technique; reflection coefficient; vector network measurement technique; weak under-coupled resonators; Cavity resonators; Connectors; Coupling circuits; Data mining; Magnetic analysis; Magnetic circuits; Measurement techniques; Microwave measurements; Microwave theory and techniques; Resonant frequency;
fLanguage :
English
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9480
Type :
jour
DOI :
10.1109/TMTT.2003.808711
Filename :
1191757
Link To Document :
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