Patents by Inventor Wang S. Kim

Wang S. Kim 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).

  • Wide band type electromagnetic wave absorber
    Patent number: 5446459
    Abstract: This invention relates to a broad bandwidth electromagnetic wave absorber comprising a sintered ferrite and a CuO--Fe.sub.2 O.sub.3 system. The CuO--Fe.sub.2 O.sub.3 system, a spinel ferrite, has its own magnetic property, which makes it possible to be used for an electromagnetic wave absorber. The CuO--Fe.sub.2 O.sub.3 system is preferentially located at the grain boundary in the matrix ferrite. This resulted in increase in the total loss, decrease in matching thickness and shift in the center frequency.
    Type: Grant
    Filed: April 11, 1994
    Date of Patent: August 29, 1995
    Assignee: Korea Institute of Science and Technology
    Inventors: Kyung Y. Kim, Wang S. Kim, Hyung J. Jung, Yoon D. Ju
  • Laminated electromagnetic wave absorber
    Patent number: 5323160
    Abstract: Ferrites as an electromagnetic wave absorber have their unique attenuation ranges depending on their compositions. The possibility of controlling attenuation characteristics of ferrite absorber by forming laminates of ferrite is disclosed. This invention provides that the center frequency of laminated ferrites could be changed arbitrarily employing ferrite with different composition and thickness. The method consists of stacking at least two soft ferrite layers (Ni-Zn, Mn-Zn) with various thickness.
    Type: Grant
    Filed: July 16, 1992
    Date of Patent: June 21, 1994
    Assignee: Korea Institute of Science and Technology
    Inventors: Kyung Y. Kim, Wang S. Kim, Hyung J. Jung, Hue S. Song