Exciting traveling waves in high-Q resonant structures can simplify low noise oscillator designs and also has applications for newly proposed Lorentz invariance tests. In this work we use microstrip probes to excite traveling waves in a sapphire dielectric resonator. Previous work has indicated that matching microstrip probes to a sapphire resonator can be a difficult requirement. A model has been developed, which takes into account leakage of the microstrip line in the reverse direction to which we excite the traveling wave. From such a model we can define the standing wave ratio (SWR). By comparing the model with experiment we find that we can excite a traveling wave with an SWR of 0.35 and an unloaded Q-factor of 1.5 x 10(5) in a WGH(12,0,2) mode at 9.997 GHz, in a sapphire cylinder of 5 cm diameter and 3 cm height. From the model, we also propose new oscillator designs for low noise applications. (c) 2006 Published by Elsevier Ltd.
|Journal||Journal of the European Ceramic Society|
|Publication status||Published - 2007|
Fowler, A., Tobar, M., Locke, C., Ivanov, E., Hartnett, J., Anstie, J., & Cros, D. (2007). Exciting traveling waves in high Q structures using microstrip. Journal of the European Ceramic Society, 27(8-9), 3023-3026. https://doi.org/10.1016/j.jeurceramsoc.2006.11.040