Patents by Inventor Liping Zhen

Liping Zhen 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).

  • Patent number: 8027699
    Abstract: The present invention provides systems and methods for band amplification with a shared amplifier. In an exemplary embodiment, the wireless band amplification device has with an amplifier with an input port and an output port. The wireless band amplification device also provides two circulators, the first circulator in communication with the input port of the amplifier and the second circulator in communication with the output port of the amplifier. Additionally, two duplexer devices are provided in communication with both circulators. The input port of the amplifier is enabled to receive at least a first frequency band downlink signal and a first frequency band uplink signal. In an alternate embodiment, the input port of the amplifier can be further adapted to receive a second frequency band downlink signal and a second frequency band uplink signal. Additionally, the input port of the amplifier can be further adapted to receive a third frequency band downlink signal and a third frequency band uplink signal.
    Type: Grant
    Filed: March 2, 2007
    Date of Patent: September 27, 2011
    Assignee: Alcatel Lucent
    Inventors: Liping Zhen, Xiangqing Xu
  • Patent number: 7903592
    Abstract: Systems and methods for multi-band amplification. In an exemplary embodiment of the present invention, the multi-band amplification device has an uplink amplifier with a first port and a second port and a downlink amplifier with a first port and a second port. Furthermore, the multi-band amplification device has a first duplexer device in communication with the first port of the downlink amplifier and the second port of the uplink amplifier and a second duplexer device in communication with the first port of the uplink amplifier and the second port of the downlink amplifier. The first duplexer device is enabled to receive and transmit at least a downlink signal and an uplink signal of a first frequency band, a downlink signal and an uplink signal of a second frequency band, and a downlink signal and an uplink signal of a third frequency band.
    Type: Grant
    Filed: March 2, 2007
    Date of Patent: March 8, 2011
    Assignee: Alcatel Lucent
    Inventors: Liping Zhen, Xiangqing Xu
  • Publication number: 20080212500
    Abstract: Systems and methods for multi-band amplification. In an exemplary embodiment of the present invention, the multi-band amplification device has an uplink amplifier with a first port and a second port and a downlink amplifier with a first port and a second port. Furthermore, the multi-band amplification device has a first duplexer device in communication with the first port of the downlink amplifier and the second port of the uplink amplifier and a second duplexer device in communication with the first port of the uplink amplifier and the second port of the downlink amplifier. The first duplexer device is enabled to receive and transmit at least a downlink signal and an uplink signal of a first frequency band, a downlink signal and an uplink signal of a second frequency band, and a downlink signal and an uplink signal of a third frequency band.
    Type: Application
    Filed: March 2, 2007
    Publication date: September 4, 2008
    Applicant: ALCATEL LUCENT
    Inventors: Liping Zhen, Xiangqing Xu
  • Publication number: 20080212502
    Abstract: The present invention provides systems and methods for band amplification with a shared amplifier. In an exemplary embodiment, the wireless band amplification device has with an amplifier with an input port and an output port. The wireless band amplification device also provides two circulators, the first circulator in communication with the input port of the amplifier and the second circulator in communication with the output port of the amplifier. Additionally, two duplexer devices are provided in communication with both circulators. The input port of the amplifier is enabled to receive at least a first frequency band downlink signal and a first frequency band uplink signal. In an alternate embodiment, the input port of the amplifier can be further adapted to receive a second frequency band downlink signal and a second frequency band uplink signal. Additionally, the input port of the amplifier can be further adapted to receive a third frequency band downlink signal and a third frequency band uplink signal.
    Type: Application
    Filed: March 2, 2007
    Publication date: September 4, 2008
    Applicant: ALCATEL LUCENT
    Inventors: Liping Zhen, Xiangqing Xu
  • Patent number: 6993286
    Abstract: The dual band bi-directional amplifier has only one amplifier chain having an uplink amplifier and a downlink amplifier, but can nonetheless amplify signals from two frequency bands in both an uplink and a downlink direction between two antennas. This is possible by using duplexers and circulators to separate signals to and from each antenna into the two bands. In particular, for each frequency band handled by the circuit, the dual band bi-directional amplifier has a duplexer set for separating the signals from one of the bands into the uplink and downlink direction. In the case of a dual band amplifier, there are two sets of duplexers, one for each band. By using duplexers and circulators to differentiate signals in different bands travelling in different directions, there is no need for additional amplifier chains, which increase the manufacturing costs.
    Type: Grant
    Filed: August 2, 2002
    Date of Patent: January 31, 2006
    Assignee: Radio Frequency Systems, Inc.
    Inventors: Liping Zhen, David L. Wills
  • Publication number: 20040192194
    Abstract: The dual band bi-directional amplifier has only one amplifier chain having an uplink amplifier and a downlink amplifier, but can nonetheless amplify signals from two frequency bands in both an uplink and a downlink direction between two antennas. This is possible by using duplexers and circulators to separate signals to and from each antenna into the two bands. In particular, for each frequency band handled by the circuit, the dual band bi-directional amplifier has a duplexer set for separating the signals from one of the bands into the uplink and downlink direction. In the case of a dual band amplifier, there are two sets of duplexers, one for each band. By using duplexers and circulators to differentiate signals in different bands travelling in different directions, there is no need for additional amplifier chains, which increase the manufacturing costs.
    Type: Application
    Filed: August 2, 2002
    Publication date: September 30, 2004
    Applicant: RADIO FREQUENCY SYSTEMS, INC.
    Inventors: Liping Zhen, David L. Wills