Precise measurements of the Q factor of dielectric resonators in the transmission mode: accounting for noise, crosstalk, delay of uncalibrated lines, coupling loss, and coupling reactance

Leong, Kenneth, and Mazierska, Janina (2002) Precise measurements of the Q factor of dielectric resonators in the transmission mode: accounting for noise, crosstalk, delay of uncalibrated lines, coupling loss, and coupling reactance. IEEE Transactions on Microwave Theory and Techniques, 50 (9). pp. 2115-2127.

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Abstract

Accurate measurements of the unloaded Q0 factor of microwave resonators are necessary in many microwave applications. The most accurate values of Q0 can be obtained by Q-circle fits from multifrequency S-parameter data. Practical measurement systems cause S-parameters of the resonators to be distorted from the circular ideal shape, rotated, and shifted from the origin resulting in errors in the Q-factor values. A novel Q-factor measurement method has been developed based on equations derived for resonators working in the transmission mode and fractional linear circle-fitting techniques. The transmission-mode Q-factor (TMQF) technique removes measurement effects of noise, noncalibrated measurement cables, connectors, coupling structures, crosstalk between the coupling loops, and impedance mismatch from the measurement data. The TMQF is especially useful in cryogenic measurements of high-temperature superconducting thin films and dielectrics since these measurements are typically done in the transmission mode and contain cables and connectors that are difficult to calibrate. The accuracy of the TMQF is better than 1% for practical measurement ranges and the method is applicable to a wide range of coupling. The range of Q factors measurable is from 103 up to 107

Item ID: 13534
Item Type: Article (Research - C1)
ISSN: 1557-9670
Keywords: measurement effects; S=parameters; TMQF; transmission-mode measurements; unloaded Q factor
Date Deposited: 08 Dec 2010 03:51
FoR Codes: 10 TECHNOLOGY > 1005 Communications Technologies > 100505 Microwave and Millimetrewave Theory and Technology @ 70%
09 ENGINEERING > 0912 Materials Engineering > 091209 Polymers and Plastics @ 30%
SEO Codes: 89 INFORMATION AND COMMUNICATION SERVICES > 8901 Communication Networks and Services > 890199 Communication Networks and Services not elsewhere classified @ 100%
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