Patents by Inventor Amitava Sen Gupta

Amitava Sen Gupta 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).

  • High spectral purity microwave oscillator using air-dielectric cavity
    Patent number: 7075378
    Abstract: A high spectral purity microwave oscillator is provided. The Oscillator uses an air-dielectric cavity and employs the known carrier-suppression technique. In one embodiment, the oscillator employs a high-Q cavity to self-sustain an oscillating signal formed by feeding back into its input a power-amplified output signal of the cavity in which residual phase noise in the amplifier stages is suppressed. A bandpass filter selects the cavity mode. FIG. 1 illustrates this embodiment. Another embodiment suppresses the noise of a voltage-controlled oscillator whose frequency and power-amplified output interrogates the cavity mode. FIG. 2 illustrates this embodiment.
    Type: Grant
    Filed: July 7, 2004
    Date of Patent: July 11, 2006
    Assignee: The United States of America as represented by the Secretary of Commerce, the National Institute of Standards and Technology
    Inventors: David A. Howe, Amitava Sen Gupta, Craig Nelson, Fred L. Walls