Patents Examined by Lam Mia
  • Longitudinally-coupled resonator surface acoustic wave filter and communication apparatus using the same
    Patent number: 6720847
    Abstract: A longitudinally-coupled resonator surface acoustic wave (SAW) filter includes a piezoelectric substrate and at least two IDTs arranged in the direction along which a SAW propagates on the piezoelectric substrate. At least one of the IDTs has an electrode finger wherein the metallization ratio of the electrode finger is different from that of the other electrode fingers of the IDT.
    Type: Grant
    Filed: June 12, 2002
    Date of Patent: April 13, 2004
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Katsuhiro Nako, Yuichi Takamine