Patents Assigned to Sawcom Limited
  • Surface acoustic wave filters
    Patent number: 6246148
    Abstract: Filter structures are described consisting of a plurality of individual surface acoustic wave (SAW) resonators formed of inter-digitated metallic combs on a common piezoelectric substrate. Areas of metallisation (1, 2, 3, 4) between the combs provide means to connect the filter in a circuit, e.g. in a mobile telephone unit to act as a filter with a passband in the 800 to 2200 MHz range. The individual SAW resonators differ from one another and are interconnected in ladder and/or balanced bridge arrangements.
    Type: Grant
    Filed: May 14, 1999
    Date of Patent: June 12, 2001
    Assignees: Clarisay, Inc., Sawcom Limited
    Inventors: James Edward Flowers, James Heighway