Patents by Inventor Evald Arvid Koitsalu

Evald Arvid Koitsalu 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).

  • Method for manufacturing an impedance adaption device
    Publication number: 20010026243
    Abstract: The present invention relates to an impedance-matching device of antenna units, and in particular to antenna-matching in small radio units. An impedance-matching device (16) is arranged in a radio equipment (10) having an antenna (12), between said antenna and a feeding unit, e.g. an output power unit, the impedance quotient of which units exceeding a factor 3. The invented impedance-matching (16) includes at least two quarter-wave transformers (18,20) connected in series, which consist of a dielectric material (28) having a dielectric coefficient &egr;, the value of which is exceeding a factor 10. The device may be made with dimensions so small that it may be integrated with the antenna to an antenna unit and despite the small dimensions, good frequency characteristics are achieved, such as good precision, easy tuning and sufficiently broad bandwidth.
    Type: Application
    Filed: March 8, 2001
    Publication date: October 4, 2001
    Applicant: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Evald Arvid Koitsalu, Lars Sveijer
  • Device for impedance adaption
    Patent number: 6222500
    Abstract: The present invention relates to an impedance-matching device of antenna units, and in particular to antenna-matching in small radio units. An impedance-matching device is arranged in a radio equipment having an antenna, between said antenna and a feeding unit, e.g. an output power unit, the impedance quotient of which units exceeding a factor 3. The invented impedance-matching includes at least two quarter-wave transformers connected in series, which consist of a dielectric material having a dielectric coefficient ∈, the value of which is exceeding a factor 10. The device may be made with dimensions so small that it may be integrated with the antenna to an antenna unit and despite the small dimensions, good frequency characteristics are achieved, such as good precision, easy tuning and sufficiently broad bandwidth.
    Type: Grant
    Filed: May 6, 1999
    Date of Patent: April 24, 2001
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Evald Arvid Koitsalu, Lars Wallin