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ISSN 2415-3400 (Online)
ISSN 1028-821X (Print)

Q-FACTOR MEASUREMENTS UNDER CONDITIONS OF CLOSE-FREQUENCY MODES CONVERGENCE IN OPEN RESONATORS

heading: 
MICROWAVE ELECTRODYNAMICS
Skresanov, VN, Glamazdin, VV
Organization: 

O. Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine
12, Proskura st., Kharkov, 61085, Ukraine
E-mail: skresanov@ire.kharkov.ua
https://doi.org/10.15407/rej2015.03.011
Language: russian
Abstract: 

A method is proposed for measuring the Q-factor of microwave resonators, which allows the study of microwave properties of materials and environments using open resonators of different types under conditions of availability of close-frequency modes in the surroundings of the given mode, the radiation losses of coupling elements and crosstalk between them. Measurement of the loaded Q-factor is based on both the representation of the frequency dependence of the resonator complex reflection or transmission coefficients by the sum of fractional-linear complex functions, describing the responses of individual modes, and approximation of a square measured frequency response by means of the variation gradient method. The eigen Q-factor calculation method is based on calculation of the resonator impedance on the measured reflectance modulus. The developed algorithms for processing measurement data are implemented in a computer program and are illustrated by the example of the processing frequency dependences of S-parameters for the open dielectric mirror resonator excited with whispering gallery modes, when the S-parameters are calculated by finite element method. Measuring quality factors by the proposed method eliminates the systematic measurement error associated with the distortion of the resonance curves, and makes it possible to perform measurements in conditions where classical methods are unsuitable.
Keywords: amplitude-frequency characteristic, fractional-linear approximation, impedance, open resonator, Q-factor measurement

Manuscript submitted  12.08.2015 г.
PACS     84.40.Dc
Radiofiz. elektron. 2015, 20(3): 11-21
Full text  (PDF)

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