Patents by Inventor Douglas Tien Lai

Douglas Tien Lai 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).

  • Multiband antenna
    Patent number: 6765542
    Abstract: A multi-band antenna comprising two or more low frequency radiators dimensioned to operate in a low frequency band, and two or more high frequency radiators dimensioned to operate in a high frequency band. Each high frequency radiator is substantially coplanar with the low frequency radiators, and is formed in a spiral with the high and low frequency radiators interleaved. A hybrid feed network has two or more antenna ports, each antenna port being coupled with a low frequency radiator and a high frequency radiator. The antenna can be used for receiving GPS L1/L2 signals. The antenna is configured to send and/or receive circularly polarized radiation.
    Type: Grant
    Filed: September 23, 2002
    Date of Patent: July 20, 2004
    Assignee: Andrew Corporation
    Inventors: Robert Daniel McCarthy, Douglas Tien Lai
  • Multiband antenna
    Publication number: 20040056822
    Abstract: A multi-band antenna comprising two or more low frequency radiators dimensioned to operate in a low frequency band, and two or more high frequency radiators dimensioned to operate in a high frequency band. Each high frequency radiator is substantially coplanar with the low frequency radiators, and is formed in a spiral with the high and low frequency radiators interleaved. A hybrid feed network has two or more antenna ports, each antenna port being coupled with a low frequency radiator and a high frequency radiator. The antenna can be used for receiving GPS L1/L2 signals. The antenna is configured to send and/or receive circularly polarized radiation.
    Type: Application
    Filed: September 23, 2002
    Publication date: March 25, 2004
    Inventors: Robert Daniel McCarthy, Douglas Tien Lai