Patents Examined by Budd Mark O.
  • High piezoelectric coupling-temperature compensated berlinite substrate member for surface acoustic wave devices
    Patent number: 4109172
    Abstract: A singly rotated propagation surface defining cut of single crystal berlinite (AIPO.sub.4) is utilized to provide a temperature compensated surface acoustic wave (SAW) substrate having a high piezoelectric coupling factor. The preferred embodiment of the invention comprises a berlinite substrate member having a propagation surface that substantially coincides with a plane defined by Euler angles Lambda = 0.0.degree., mu = 80.4.degree., and Theta = 0.0.degree..
    Type: Grant
    Filed: August 19, 1977
    Date of Patent: August 22, 1978
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Robert M. O'Connell