THE DESIGN OF FUNDAMENTAL MODE THICKNESS-SHEAR QUARTZ RESONATORS (MILITARY TYPES: CR-18/U AND CR-19/U)
COMPTOMETER CORP NILES IL UNION THERMOELECTRIC DIV
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Research concerns the design of fundamental mode quartz resonators in the CR-18U frequency range. Basic problems associated with AT type resonator design are discussed, along with the relative advantages of various plate configurations. Investigations were limited to circular plates and to spherical beveling or contouring, where necessary. Three plate designs were chosen for extensive study plane parallel, plano-convex, and bi-convex. The effects of the various plate parameters on the performance of resonators of these designs are discussed. Tables of numerical results obtained with the experimental units that were fabricated are also included. Satisfactory results were obtained with plane-parallel plates from 7 to 20 mc., with plano-convex plates from 1.4 to 9 mc., and with bi-convex plates from 850 kc. to 4.0 mc. Specific design data is given for plano-convex plates from 1.4 to 10 mc., and for bi-convex plates from 800 kc. to 1.5 mc.
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