Patents by Inventor Mohsen Shahmohammadi Ghahsareh

Mohsen Shahmohammadi Ghahsareh 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).

  • Microelectromechanical resonators with passive frequency tuning using variable impedance circuits
    Patent number: 8350633
    Abstract: Periodic signal generators include an oscillator circuit, which is configured to generate a first periodic signal at an output thereof, and a piezoelectric-based microelectromechanical resonator. The resonator is configured to generate a second periodic signal at a first electrode thereof, which is electrically coupled to the oscillator circuit. A variable impedance circuit is provided, which is electrically coupled to a second electrode of the piezoelectric-based microelectromechanical resonator. The variable impedance circuit is configured to passively modify a frequency of the second periodic signal by changing an induced electromechanical stiffness in at least a portion of the piezoelectric-based microelectromechanical resonator.
    Type: Grant
    Filed: July 1, 2011
    Date of Patent: January 8, 2013
    Assignee: The Board of Regents for Oklahoma State University
    Inventors: Reza Abdolvand, Mohsen Shahmohammadi Ghahsareh, Mohammad J. Modarres-Zadeh