Accession Number : AD0721976

Title :   Capacitance and Field Distributions for Interdigital Surface-Wave Transducers,

Corporate Author : MCGILL UNIV MONTREAL (QUEBEC) DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Farnell,Gerald W. ; Cermak,Ivan A. ; Silvester,P. ; Wong,S. K.

Report Date : 30 NOV 1969

Pagination or Media Count : 8

Abstract : A boundary-shift technique used in conjunction with relaxation solutions of Laplace's equation allows the convenient numerical evaluation of the potential in the neighborhood of interdigital comb structures. With this method, the area of computation in the unbounded problem can be restricted to the region of interest near the electrode and interface surfaces. Because of the point-by-point nature of the calculation, a wide range of geometries can be studied with the inclusion of the effects of finger thickness and shape, and of any layers present. Capacitance values for many single interface and layered configurations of surface-wave transducers are presented along with a few representative examples of potential and field maps. (Author)

Descriptors :   (*PIEZOELECTRIC TRANSDUCERS, ELECTROSTATIC FIELDS), (*PIEZOELECTRIC CRYSTALS, MECHANICAL WAVES), CAPACITANCE, VOLTAGE, ULTRASONIC RADIATION, POTENTIAL THEORY, NUMERICAL ANALYSIS, CANADA

Subject Categories : Line, Surface and Bulk Acoustic Wave Devices
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE