Patents by Inventor Matti I. Kangas

Matti I. Kangas 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).

  • Antenna switching circuits for radio telephones
    Patent number: 6115585
    Abstract: Disclosed are various embodiments of circuitry for coupling first and second transceivers of a dual band radio telephone to integral and external antennas. The circuitry uses impedance matching lengths of transmission lines and switches arranged to provide a minimum insertion loss. Also disclosed is an embodiment for use with a single band radio telephone, such as a digital TDMA radio telephone that either transmits or receives at any given time. Also disclosed is an antenna switching arrangement for a dual band phone that eliminates a requirement for duplexers.
    Type: Grant
    Filed: January 6, 1998
    Date of Patent: September 5, 2000
    Assignee: Nokia Mobile Phones Limited
    Inventors: Jorma Matero, Matti I Kangas
  • Antenna switching circuits for radio telephones
    Patent number: 5768691
    Abstract: Disclosed are various embodiments of circuitry for coupling first and second transceivers of a dual band radio telephone to integral and external antennas. The circuitry uses impedance matching lengths of transmission lines and switches arranged to provide a minimum insertion loss. Also disclosed is an embodiment for use with a single band radio telephone, such as a digital TDMA radio telephone that either transmits or receives at any given time. Also disclosed is an antenna switching arrangement for a dual band phone that eliminates a requirement for duplexers.
    Type: Grant
    Filed: August 7, 1996
    Date of Patent: June 16, 1998
    Assignee: Nokia Mobile Phones Limited
    Inventors: Jorma Matero, Matti I. Kangas