We report new measurements of dielectricproperties of Lanthanum gallium silicate (Langasite orLGS) conducted with the whispering-gallery mode techniqueat microwave frequencies and between 4.2 K and300 K. The real part of the permittivity tensor of LGSpresents two components having temperature coefficients ofopposite sign. This unique property enables the design of atemperature compensated resonator that may be useful inbuilding stable microwave oscillators or filters. We reportalso the first measurements of the two independent componentsof the imaginary part of the permittivity tensor.It appears LGS is a relatively high-loss dielectric materialcompared with sapphire or quartz.
|Journal||IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control|
|Publication status||Published - 2004|
Giordano, V., Hartnett, J., Krupka, J., Kersale Y., N. V., Bourgeois, P-Y., & Tobar, M. (2004). Whispering-Gallery Mode Technique Applied to the Measurement of the Dielectric Properties of Langasite Between 4 K and 300 K. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 51(5), 484-490. https://doi.org/10.1109/TUFFC.2004.1302756