Temperature sensitivity of dielectric resonators and dielectricresonator oscillators

摘要

Experiments were performed on L-band and S-banddielectric resonators (DRs) and direct-resonator-based oscillators(DROs) to investigate the details of their behavior with variation intemperature. Measurements were performed using commercially availableZr/Sn titanate and barium tetratitanate dielectric resonator materialsenclosed in metal cavities. The results indicate that the temperaturecoefficient of the resonant frequency, τ_f, supplied byvendors of the high-dielectric-constant ceramics, is not sufficient topredict accurately a DRO's total frequency excursion over a giventemperature range. Significant second-order contributions to thefrequency versus temperature characteristics were observed, with valuesranging from -27 to +20 p.p.b./° C². In addition thecavity material used to enclose the DR can significantly alter itstemperature characteristic. Procedures have been developed to aid in theestimation of a DRO's characteristic temperature sensitivity. They canbe used to adjust the DRO design to minimize the total frequencyexcursion over a desired temperature range