Patents Examined by Stanley T. Krawozewicz
  • Microwave proximity detector
    Patent number: 4045727
    Abstract: A non-contacting method and apparatus for proximity detection with negligible radiation loss utilizes a microwave junction essentially having propagating waves on one side and evanescent electromagnetic fields on the other. Perturbation of the evanescent fields by an object causes a variation in the reflection coefficient of the propagation mode which is dependent on the distance from the junction to the object. This variation can be detected by measuring the phase shift of the propagating reflected waves relative to a reference.
    Type: Grant
    Filed: March 15, 1976
    Date of Patent: August 30, 1977
    Assignee: General Electric Company
    Inventors: Se Puan Yu, Gary H. Glover