TY - JOUR
T1 - Exciting traveling waves in high Q structures using microstrip
AU - Fowler, Alison
AU - Tobar, Michael
AU - Locke, Clayton
AU - Ivanov, Eugene
AU - Hartnett, John
AU - Anstie, James
AU - Cros, D.
PY - 2007
Y1 - 2007
N2 - 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.
AB - 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.
U2 - 10.1016/j.jeurceramsoc.2006.11.040
DO - 10.1016/j.jeurceramsoc.2006.11.040
M3 - Article
VL - 27
SP - 3023
EP - 3026
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
SN - 0955-2219
IS - 8-9
ER -