Article

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

Regional Research Laboratory, 695019 Trivandrum, India; Physics Department, University of Western Australia, Nedlands, 6907 Perth, Australia; Department of Electronics, Cochin University of Science and Technology, Cochin 682022, India
Materials Letters DOI:10.1016/S0167-577X(00)00118-X pp.279-285

ABSTRACT A microwave dielectric ceramic resonators based on BaCe2Ti5015 and Ba5Nb4O15 have been prepared by conventional solid state ceramic route. The dielectric resonators (DRs) have 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. The BaCe2Ti5O15 and Ba5Nb4O15 have quality factors (Q×F) of 30,600 and 53,000 respectively. The quality factor is found to depend on the azimuthal mode numbers. The temperature coefficient of resonant frequency (τf) of BaCe2Ti5O15 and Ba5Nb4O15 have been measured accurately using different resonant modes and are +41 and +78 ppm/K, respectively.

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Keywords

accurate determination
 
azimuthal mode numbers
 
conventional solid state ceramic route
 
different resonant modes
 
DRs
 
temperature coefficient
 
whispering gallery mode