Exciting traveling waves in high Q structures using microstrip

Alison Fowler, Michael Tobar, Clayton Locke, Eugene Ivanov, John Hartnett, James Anstie, D. Cros

Research output: Contribution to journalArticlepeer-review


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.
Original languageEnglish
Pages (from-to)3023-3026
JournalJournal of the European Ceramic Society
Issue number8-9
Publication statusPublished - 2007


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