Accession Number : ADD012165

Title :   Piezoelectric Resonators Using Lateral Field Excitation.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Ballato,Arthur

Report Date : 30 Jan 1986

Pagination or Media Count : 38

Abstract : Briefly, the objects of the invention are provided in accordance with a piezoelectric crystal resonator element preferably comprised of doubly rotated cuts of piezoelectric material including quartz, aluminum phosphate, lithium tantalate or lithium niobate which uses lateral field excitation and further includes an improved body geometry having recessed electrode regions adjacent a relatively raised piezoelectric region formed on at least one, but preferably both major faces or surfaces of a piezoelectric crystal element. The basic configuration of the piezoelectric element may be either a plate-like shape (plano) or a contoured shape with a plano-convex profile or a convex-convex profile. The convex-convex and plano-convex configurations tend to enhance the energy trapping phenomenon. Single or double mesas are formed on the element with electrode regions of lesser thickness formed thereon adjacent the respective mesa or horizontal channels of a predetermined depth formed in the element with electrodes of a lesser or equal depth being fabricated therein. Additionally, curved edges at the electrode-crystal interfaces are included to reduce field gradients as well as tapered electrodes which have the effect of increasing the energy trapping produced in the area of the crystal between the electrodes.

Descriptors :   *PATENT APPLICATIONS, *PIEZOELECTRIC CRYSTALS, *PLATES, *PIEZOELECTRIC MATERIALS, *RESONATORS, ALUMINUM, CHANNELS, CONFIGURATIONS, CONTOURS, CRYSTALS, CURVED PROFILES, EDGES, ELECTRODES, ENERGY, FIELD THEORY, GRADIENTS, HORIZONTAL ORIENTATION, INVENTIONS, LITHIUM NIOBATES, LITHIUM TANTALATES, PHOSPHATES, PIEZOELECTRICITY, QUARTZ, REGIONS, SHAPE, TAPER, THICKNESS

Subject Categories : Electrical and Electronic Equipment
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE