Patents by Inventor Masufumi Iwaki

Masufumi Iwaki 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 frequency device, filter, duplexer, communication module, and communication apparatus
    Patent number: 8350643
    Abstract: In a high frequency device, resonators (IDT capacitors) that function as capacitors are included in a lumped constant balun included in a filter or duplexer, and furthermore, the resonance frequency of the IDT capacitors is set higher than the passband frequency of the filter. This improves the capacitor Q value, thus enabling the realization of a low-loss balance filter.
    Type: Grant
    Filed: September 30, 2009
    Date of Patent: January 8, 2013
    Assignee: Taiyo Yuden Co., Ltd.
    Inventors: Shogo Inoue, Jun Tsutsumi, Motoaki Hara, Masufumi Iwaki, Takashi Matsuda, Masanori Ueda
  • Resonator, filter and electronic device
    Patent number: 8164398
    Abstract: A resonator includes a substrate, a lower electrode, a piezoelectric film provided on the lower electrode, and an upper electrode provided on the piezoelectric film. The lower electrode includes a first film provided on the substrate, and a second film that is provided on the first film and has a specific gravity greater than that of the first film. The piezoelectric film is provided on the second film. The upper electrode includes a third film provided on the piezoelectric film, and a fourth film provided on the third film, the third film having a specific gravity greater than that of the fourth film. The third film is thicker than the second film.
    Type: Grant
    Filed: August 25, 2009
    Date of Patent: April 24, 2012
    Assignee: Taiyo Yuden Co., Ltd.
    Inventors: Shinji Taniguchi, Tokihiro Nishihara, Masufumi Iwaki, Masanori Ueda, Go Endo, Tsuyoshi Yokoyama, Takeshi Sakashita, Motoaki Hara
  • HIGH FREQUENCY DEVICE, FILTER, DUPLEXER, COMMUNICATION MODULE, AND COMMUNICATION APPARATUS
    Publication number: 20100194494
    Abstract: In a high frequency device, resonators (IDT capacitors) that function as capacitors are included in a lumped constant balun included in a filter or duplexer, and furthermore, the resonance frequency of the IDT capacitors is set higher than the passband frequency of the filter. This improves the capacitor Q value, thus enabling the realization of a low-loss balance filter.
    Type: Application
    Filed: September 30, 2009
    Publication date: August 5, 2010
    Applicant: FUJITSU LIMITED
    Inventors: Shogo INOUE, Jun Tsutsumi, Motoaki Hara, Masufumi Iwaki, Takashi Matsuda, Masanori Ueda