Patents Assigned to Kobayasi Institute of Physical Research
  • Elastic wave control element using piezoelectric materials
    Patent number: 6548936
    Abstract: An elastic wave control element includes a piezoelectric material which is inserted into a propagation path for an elastic wave or installed in an oscillator to allow the elastic wave in a selected frequency to be damped, reflected, or transmitted. The piezoelectric material is provided with a pair of electrodes between which a negative capacitance circuit is connected to allow a loss factor of the negative capacitance circuit in a selected frequency or frequency band to be matched with a dielectric loss factor of the piezoelectric material.
    Type: Grant
    Filed: August 8, 2001
    Date of Patent: April 15, 2003
    Assignees: Rion Co., Ltd., Kobayasi Institute of Physical Research
    Inventors: Hidekazu Kodama, Fumitaka Funahashi, Munehiro Date, Eiichi Fukada, Tomonao Okubo, Kazunori Kimura