Patents by Inventor Henrik Oja

Henrik Oja 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).

  • Arrangement for measuring condition of antenna in mobile telephone system
    Patent number: 6131020
    Abstract: An arrangement for measuring a condition of an antenna in a mobile telephone system has a radio equipment and a transmission line connecting the radio equipment to the antenna. The transmission line has opposite end sections, whereby one of the end sections of the transmission line is closer to the antenna than the other of the end sections of the transmission line. A masthead amplifier is at the one of the end sections of the transmission line, the masthead amplifier having first and second duplex filters, an RX branch, a TX branch and an amplifier element in the RX branch, wherein the RX branch, the TX branch and the amplifier element are between the duplex filters. The standing wave ratio is measured and a measuring value calculated therefrom within the one end section of the transmission line for measuring the condition of the antenna.
    Type: Grant
    Filed: November 18, 1997
    Date of Patent: October 10, 2000
    Assignee: ADC Solitra Oy
    Inventors: Henrik Oja, Markku Tiihonen