Patents by Inventor Lixin Ran

Lixin Ran 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: 10958295
    Abstract: Disclosed is a system and method for a complex domain radio frequency (RF) frontend, adaptive beamforming can separate the relatively slowly changed waveform delay information required from wideband RF signals, upon which a self-contained beamforming system is implemented with a low-speed baseband. By introducing vector RF multipliers in the frontend of the present invention, the amplitude and phase of RF signals are simultaneously controlled by the real and imaginary parts of complex numbers, such that beamforming algorithms derived in complex domain can be directly applied without any form of transformation. By doing so, the massive use of conventional T/R modules and high-speed baseband devices can be avoided, thus simplifying the realization and decreasing the cost of wideband digital beamforming systems for use in low cost, power efficient beamforming applications.
    Type: Grant
    Filed: September 20, 2017
    Date of Patent: March 23, 2021
    Assignee: TEXAS TECH UNIVERSITY SYSTEM
    Inventors: Zhengyu Peng, Changzhi Li, Lixin Ran
  • Publication number: 20200325413
    Abstract: A lubricating fluid suitable for use as a shock absorber fluid is disclosed. The lubricating fluid comprises at least 40 wt %, based upon the weight of the lubricating fluid, of a GTL base oil, has a viscosity index in the range of from 50 to 1000, and a pour point of below ?30° C.
    Type: Application
    Filed: May 23, 2017
    Publication date: October 15, 2020
    Inventors: Lixin RAN, Xi WANG, Peter William Robert SMITH
  • Publication number: 20190372609
    Abstract: Disclosed is a system and method for a complex domain radio frequency (RF) frontend, adaptive beamforming can separate the relatively slowly changed waveform delay information required from wideband RF signals, upon which a self-contained beamforming system is implemented with a low-speed baseband. By introducing vector RF multipliers in the frontend of the present invention, the amplitude and phase of RF signals are simultaneously controlled by the real and imaginary parts of complex numbers, such that beamforming algorithms derived in complex domain can be directly applied without any form of transformation. By doing so, the massive use of conventional T/R modules and high-speed baseband devices can be avoided, thus simplifying the realization and decreasing the cost of wideband digital beamforming systems for use in low cost, power efficient beamforming applications.
    Type: Application
    Filed: September 20, 2017
    Publication date: December 5, 2019
    Applicant: TEXAS TECH UNIVERSITY SYSTEM
    Inventors: Zhengyu Peng, Changzhi Li, Lixin Ran
  • Patent number: 8928543
    Abstract: A gyrotropic metamaterial structure that include a plurality of chiral metamaterials forming one or more pairs of dipole structures. A plurality of lumped circuits are positioned between the one or more pairs of dipole structures. The lumped circuits have a plurality of subwavelengths antennas that are combined to change the polarization states of an incident polarized wave by producing Faraday-like rotation allowing for nomeciprocal propagation of the incident polarized wave.
    Type: Grant
    Filed: July 13, 2012
    Date of Patent: January 6, 2015
    Assignee: Massachusetts Institute of Technology
    Inventors: Zheng Wang, Marin Soljacic, Zhiyu Wang, John D. Joannopoulos, Lixin Ran
  • Publication number: 20140085155
    Abstract: A gyrotropic metamaterial structure that include a plurality of chiral metamaterials forming one or more pairs of dipole structures. A plurality of lumped circuits are positioned between the one or more pairs of dipole structures. The lumped circuits have a plurality of subwavelengths antennas that are combined to change the polarization states of an incident polarized wave by producing Faraday-like rotation allowing for nomeciprocal propagation of the incident polarized wave.
    Type: Application
    Filed: July 13, 2012
    Publication date: March 27, 2014
    Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGY
    Inventors: Zheng Wang, Marin Soljacic, Zhiyu Wang, John D. Joannopoulos, Lixin Ran