Patents by Inventor Terrance D. Lingren

Terrance D. Lingren has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for improving selectivity in cylindrical TE.sub.011 filters by TE.sub.211 /TE.sub.311 mode control
    Patent number: 4439747
    Abstract: A method for designing low loss cylindrical TE.sub.011 mode resonators which permits selective placement of a transmission null at a frequency near the TE.sub.011 resonance frequency. The frequencies of the TE.sub.211 and TE.sub.311 modes, that are naturally excited in the resonator, are controlled by the angular displacement of the resonator input port and output port and by the relative amplitude of the TE.sub.011 mode compared to the TE.sub.211 and TE.sub.311 modes. Proper placement of the transmission nulls improves the selectivity of the TE.sub.011 resonator, and/or can be used to filter out unwanted noise at the frequency of the transmission null. A lumped constant analog circuit model is presented to assist in design of the resonator.
    Type: Grant
    Filed: June 7, 1982
    Date of Patent: March 27, 1984
    Assignee: Hughes Aircraft Co.
    Inventors: Donald E. Kreinheder, Terrance D. Lingren