Patents by Inventor John Claassen

John Claassen 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).

  • Magnetic ferrite microwave resonator frequency adjuster and tunable filter
    Patent number: 6501971
    Abstract: A magnetic ferrite microwave resonator frequency tunable filter and method for tuning a filter having both a resonator portion and a tuning portion. The resonator portion has an input for receiving an electromagnetic signal and an output for emitting an electromagnetic signal. A tuning portion includes a magnetic ferrite element disposed in first and second magnetic fields generated by a fixed magnet and an electromagnet. The magnetic ferrite element has a magnetic permeability determined by the first and second magnetic fields. The first magnetic field places a ferromagnetic resonance frequency of the ferrite element near a frequency of the electromagnetic signal transmitted by the resonator portion. The second magnetic field is variable in response to a varying current supplied to the electromagnet to change the permeability of the ferrite element, to thereby alter the center frequency of the resonator, thereby facilitating tuning of the electromagnetic signal.
    Type: Grant
    Filed: October 30, 1996
    Date of Patent: December 31, 2002
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Stuart A. Wolf, Frederic J. Rachford, John Claassen