Dual-Mode Crystal Resonators with Stable Parameters of Both Modes in Wide Temperature

This article contains the information about the investigation of activity dips of plano-convex resonators for dual-mode crystal oscillators. It is proved, that the reason is acoustic interaction between the inharmonic components of C-mode with a high index and the B-mode. Conditions of existence of interfering vibration are determined. Using these data it is possible to define the geometrical sizes of the resonator which is not having activity dip of B-mode owing to influence inharmonic components of C-mode