Patents by Inventor Mark Spencer Suthers

Mark Spencer Suthers 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).

  • Longitudinally coupled double mode surface wave resonators
    Patent number: 5835990
    Abstract: A longitudinally coupled double mode surface wave resonator comprises two reflectors, two lateral IDTs (inter-digital transducers), and a centre IDT arranged on a surface of a piezoelectric substrate, for coupling surface waves longitudinally between the IDTs. The two lateral IDTs operate with opposite signal phases by virtue of opposite connections, opposite polarities, or oppositely phased spacings from the centre IDT. Alternatively, or in addition, the centre IDT is divided into two oppositely phased halves. A filter comprising one or more resonators can replace both a filter and a balun in a radio frequency circuit.
    Type: Grant
    Filed: June 6, 1996
    Date of Patent: November 10, 1998
    Assignee: Northern Telecom Limited
    Inventors: John Choo Beng Saw, Ji-Dong Dai, Yufeng Xu, Mark Spencer Suthers, Conrad Fran.cedilla.ois Gratton