MASS-LOADING EFFECT ON CHARACTERISTICS OF QUARTZ AND LANGASITE DEVICES: COMPARATIVE STUDY

摘要

This paper presents some of the more relevant results concerning the mass-loading influence on characteristics of quartz and langasite resonators and monolithic filters. Based on the Ballato’s transmission-line analogs of the trappedenergy resonators vibrating in thickness-shear mode, the mass-loading effect on electrical resonator characteristics was studied. The effective mass-loading, motional inductance and quality factor of quartz and langasite resonators, as a function of harmonic order for various electrode parameters, were computed. The experimental investigations on frequencytemperature characteristics of plan-parallel Y-cut langasite resonators for various mass-loading conditions were done. In the frame of theTiersten’s analysis of monolithic structure, the theoretical calculations of the coupling coefficient of two-pole quartz and langasite monolithic filters as a function of massloading were performed. The analysis of these results shows that the mass-loading influence on characteristics of langasite resonators and monolithic filters is lower than on those of the quartz devices.