Patents by Inventor Liu Donghui

Liu Donghui 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 device
    Patent number: 6909401
    Abstract: An antenna device for a radio communication device, preferably a portable radio communication device, comprising a first antenna element (20) comprising a first feeding portion (22) connected to a first feeding device (24), a second antenna element (30; 230; 330; 430; 530; 630) comprising second feeding portions (32, 33; 332, 333) connected to a second feeding device (34), wherein said first antenna element (20) has an unbalanced feed, and said second antenna element (30; 230; 330; 430; 530; 630) has an essentially balanced feed.
    Type: Grant
    Filed: July 10, 2001
    Date of Patent: June 21, 2005
    Assignee: AMC Centurion AB
    Inventors: Tomas Rutfors, Christian Braun, Henrik Falken, Lennart Håkansson, Liu Donghui, Anders Thornell-Pers
  • Antenna arrangement and a portable radio communication device
    Publication number: 20040051669
    Abstract: An antenna arrangement for a portable radio communication device, comprising a first (1) and a second (2) antenna element, and a conductive shield (4) connectable to a ground plane device (3), said first (1) and second (2) antenna elements are located on opposite sides of the shield (4), wherein said first (1) and second (2) antenna elements are of different types.
    Type: Application
    Filed: September 25, 2003
    Publication date: March 18, 2004
    Inventors: Tomas Rutfors, Christian Braun, Henrik Falken, Lennart Hakansson, Liu Donghui
  • Antenna device
    Publication number: 20030189519
    Abstract: An antenna device for a radio communication device, preferably a portable radio communication device, comprising a first antenna element (20) comprising a first feeding portion (22) connected to a first feeding device (24), a second antenna element (30; 230; 330; 430; 530; 630) comprising second feeding portions (32, 33; 332, 333) connected to a second feeding device (34), wherein said first antenna element (20) has an unbalanced feed, and said second antenna element (30; 230; 330; 430; 530; 630) has an essentially balanced feed.
    Type: Application
    Filed: February 25, 2003
    Publication date: October 9, 2003
    Inventors: Tomas Rutfors, Christian Braun, Henrik Falken, Lennart Hakansson, Liu Donghui, Anders Thornell-Pers
  • Antenna device for transmitting and/or receiving RF waves
    Patent number: 6392610
    Abstract: An antenna device for transmitting and/or receiving RF waves connectable to a radio communication device and including a radiating structure with at least two switchable antenna elements. At least one switching element, arranged in a central switching unit, selectively connects and disconnects the at least two switchable antenna elements. The at least two antenna elements can be individually switched between different coupling states by the central switching unit. The central switching unit has a control port for reception of control signals enabling the central switching unit to effect a centralized switching of said at least two switchable antenna elements.
    Type: Grant
    Filed: November 15, 2000
    Date of Patent: May 21, 2002
    Assignee: Allgon AB
    Inventors: Christian Braun, Olov Edvardsson, Leif Eriksson, Liu Donghui