Patents by Inventor Bengt Ulrik Imberg

Bengt Ulrik Imberg 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 switch module
    Patent number: 6560444
    Abstract: A switching circuit connects transceivers for different frequencies alternatively to a common antenna. The circuit including a plurality of sets, each including a plurality of PIN diodes connected in series, and the PIN diodes in a set may be activated by a DC current, which DC current is led through a bias resistor, creating a bias voltage. This bias voltage is used for reverse biasing the PIN diodes in another set, thus eliminating quiescent PIN diodes therein from creating spurious signals. The circuit is particularly suited for cellular mobile telephones using two frequency bands.
    Type: Grant
    Filed: December 21, 1999
    Date of Patent: May 6, 2003
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Bengt Ulrik Imberg