Microwave characterisation of BaCe2Ti5O15 and Ba5Nb4O15 ceramic dielectric resonators using whispering gallery mode method

Microwave dielectric ceramic resonators based on BaCe2Ti5O15 and Ba5Nb4O15 were prepared by the conventional solid state ceramic route. The resonators had high dielectric constant - 32 and 40 for BaCe2Ti5O15 and Ba5Nb4O15, respectively. The whispering gallery mode (WGM) technique was employed for th...

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Bibliographic Details
Published in:Materials letters 2000-09, Vol.45 (5), p.279-285
Main Authors: Ratheesh, R, Sebastian, M.T, Mohanan, P, Tobar, M.E, Hartnett, J, Woode, R, Blair, D.G
Format: Article
Language:English
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Summary:Microwave dielectric ceramic resonators based on BaCe2Ti5O15 and Ba5Nb4O15 were prepared by the conventional solid state ceramic route. The resonators had high dielectric constant - 32 and 40 for BaCe2Ti5O15 and Ba5Nb4O15, respectively. The whispering gallery mode (WGM) technique was employed for the accurate determination of the dielectric properties in the microwave frequency range. BaCe2Ti5O15 and Ba5Nb4O15 had quality factors (Q x F) of 30600 and 53000 respectively. The quality factor is found to depend on the azimuthal mode numbers. The temperature coefficient of resonant frequency (tauf) of BaCe2Ti5O15 and Ba5Nb4O15 was measured accurately using different resonant modes and was +41 and +78 ppm/K, respectively. 13 refs.
ISSN:0167-577X
DOI:10.1016/S0167-577X(00)00118-X