Patents by Inventor Seng-Woon Chen

Seng-Woon Chen 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).

  • System and method for constant loop gain in a closed loop circuit
    Patent number: 6728520
    Abstract: A system and method for controlling transmitted output power of outdoor antenna units coupled to hand held wireless devices. When the antenna unit is operating with wireless network technology it may also be referred to as an outdoor unit. Transmit power level of an information signal is controlled in the outdoor unit by obtaining a control voltage from the hand held unit. The control voltage is used by the outdoor unit, to adjust the power level of the transmitted information signal. The transmit power level is adjusted by the outdoor unit performing the following steps: (1) detecting the transmit power level of the antenna unit, (2) determining whether the transmit power level is equal to a control voltage, and (3) adjusting the transmit power level based on the control voltage if the transmit power level is not equal to the control voltage. The adjustment of the transmit power level is accomplished by a closed loop circuit that maintains a constant loop gain.
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: April 27, 2004
    Assignee: Qualcomm Incorporated
    Inventors: Phil Coan, Seng-Woon Chen
  • SYSTEM AND METHOD FOR CONSTANT LOOP GAIN IN A CLOSED LOOP CIRCUIT
    Publication number: 20030040342
    Abstract: A system and method for controlling transmitted output power of outdoor antenna units coupled to hand held wireless devices. When the antenna unit is operating with wireless network technology it may also be referred to as an outdoor unit. Transmit power level of an information signal is controlled in the outdoor unit by obtaining a control voltage from the hand held unit. The control voltage is used by the outdoor unit, to adjust the power level of the transmitted information signal. The transmit power level is adjusted by the outdoor unit performing the following steps: (1) detecting the transmit power level of the antenna unit, (2) determining whether the transmit power level is equal to a control voltage, and (3) adjusting the transmit power level based on the control voltage if the transmit power level is not equal to the control voltage. The adjustment of the transmit power level is accomplished by a closed loop circuit that maintains a constant loop gain.
    Type: Application
    Filed: August 31, 1999
    Publication date: February 27, 2003
    Inventors: PHIL COAN, SENG-WOON CHEN
  • Coupling for dual-mode resonators and waveguide filter
    Patent number: 5268659
    Abstract: Dual-mode resonators are coupled together to form a highly selective bandpass filter by means of a short section of waveguide. The short sections have cutoff frequencies beyond the passband of the filter. The coupling is adjustable over a wide range by means of adjustable screws. The coupling means is applicable to both empty cavities and dielectric-resonator-loaded cavities.
    Type: Grant
    Filed: April 29, 1991
    Date of Patent: December 7, 1993
    Assignee: University of Maryland
    Inventors: Kawthar A. Zaki, Seng-Woon Chen