Patents by Inventor Xiaojun Qiu

Xiaojun Qiu 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: 10978786
    Abstract: Provided is an antenna system applied to a mobile terminal and including a back shell having a metal frame, a main board received in the back shell, an antenna unit provided between the back shell and the main board. The main board includes a front surface facing towards the antenna unit and a back surface arranged opposite to and spaced apart from the front surface. The mobile terminal includes a first metal ground layer and a first electrode plate provided on the front surface, a second metal ground layer and a second electrode plate provided on the back surface. The first electrode plate and the second electrode plate are spaced apart from the first and second metal ground layer, and connected to the antenna unit and the metal frame. The first and second electrode plates are arranged opposite to and spaced apart from each other to form a capacitor structure.
    Type: Grant
    Filed: July 30, 2019
    Date of Patent: April 13, 2021
    Assignee: AAC Technologies Pte. Ltd.
    Inventor: Xiaojun Qiu
  • Patent number: 10931008
    Abstract: An antenna module including a first antenna and a second antenna close to the first antenna. The second antenna includes an isolation circuit and a second tuning switch controlling an access state of the isolation circuit. The second tuning switch includes two modes. When the second tuning switch is in a first mode, the isolation circuit accesses to a feeding network of the second antenna. When the second tuning switch is in a second mode, the isolation circuit does not access to the feeding network of the second antenna. Isolation of the first antenna and the second antenna in a preset band in the first mode is superior to that in the second mode.
    Type: Grant
    Filed: July 28, 2019
    Date of Patent: February 23, 2021
    Assignee: AAC Technologies Pte. Ltd.
    Inventor: Xiaojun Qiu
  • Patent number: 10923817
    Abstract: An antenna system and a mobile terminal are provided. The antenna system includes a front frame rib connecting a system ground with a first short-axis frame, a slit provided on a first long-axis frame, a radio frequency front end area provided in system ground, and first and second frame-joint points each connecting radio frequency front end area with a metal frame. The first and second frame-joint points are located between front frame rib and slit. The radio frequency front end area includes a feeding point, a matching circuit, an impedance tuning circuit and a switching circuit. The impedance tuning circuit and the switching circuit are adjusted to switch an operating state of antenna system in such a manner that the antenna system operates in different frequency bands. The antenna system includes one operating state in which the antenna system operates in a frequency band ranging from 1710 MHz to 2700 MHz.
    Type: Grant
    Filed: December 5, 2019
    Date of Patent: February 16, 2021
    Assignee: AAC Technologies Pte. Ltd.
    Inventors: Xiaojun Qiu, Bo Zhu
  • Patent number: 10868355
    Abstract: An antenna module includes a first antenna and a second antenna. The first antenna forms multiple operating states. By switching the multiple operating states, the first antenna supports an LTE low frequency of 698-960 MHz and an LTE medium-high frequency of 1710-2690 MHz, and supports multi-carrier aggregation in the band. In each operating state, the first antenna also operates in 5G bands of 3300-3800 MHz and 4800-5000 MHz, the second antenna operates in 5G bands of 3300-3800 MHz and 4800-5000 MHz and a new TDD-LTE band of 5150-5925 MHz. The first antenna and the second antenna together form a 2×2 MIMO of 5G bands of 3300-3800 MHz and 4800-5000 MHz. The antenna module provided by the disclosure has better communication performance.
    Type: Grant
    Filed: July 30, 2019
    Date of Patent: December 15, 2020
    Assignee: AAC Technologies Pte. Ltd.
    Inventors: Xiaojun Qiu, Bo Zhu
  • Publication number: 20200212571
    Abstract: An antenna system and a mobile terminal are provided. The antenna system includes a front frame rib connecting a system ground with a first short-axis frame, a slit provided on a first long-axis frame, a radio frequency front end area provided in system ground, and first and second frame-joint points each connecting radio frequency front end area with a metal frame. The first and second frame-joint points are located between front frame rib and slit. The radio frequency front end area includes a feeding point, a matching circuit, an impedance tuning circuit and a switching circuit. The impedance tuning circuit and the switching circuit are adjusted to switch an operating state of antenna system in such a manner that the antenna system operates in different frequency bands. The antenna system includes one operating state in which the antenna system operates in a frequency band ranging from 1710 MHz to 2700 MHz.
    Type: Application
    Filed: December 5, 2019
    Publication date: July 2, 2020
    Inventors: Xiaojun Qiu, Bo Zhu
  • Publication number: 20200058984
    Abstract: An antenna module includes a first antenna and a second antenna. The first antenna forms multiple operating states. By switching the multiple operating states, the first antenna supports an LTE low frequency of 698-960 MHz and an LTE medium-high frequency of 1710-2690 MHz, and supports multi-carrier aggregation in the band. In each operating state, the first antenna also operates in 5G bands of 3300-3800 MHz and 4800-5000 MHz, the second antenna operates in 5G bands of 3300-3800 MHz and 4800-5000 MHz and a new TDD-LTE band of 5150-5925 MHz. The first antenna and the second antenna together form a 2×2 MIMO of 5G bands of 3300-3800 MHz and 4800-5000 MHz. The antenna module provided by the disclosure has better communication performance.
    Type: Application
    Filed: July 30, 2019
    Publication date: February 20, 2020
    Inventors: Xiaojun Qiu, Bo Zhu
  • Publication number: 20200058993
    Abstract: An antenna module including a first antenna and a second antenna close to the first antenna. The second antenna includes an isolation circuit and a second tuning switch controlling an access state of the isolation circuit. The second tuning switch includes two modes. When the second tuning switch is in a first mode, the isolation circuit accesses to a feeding network of the second antenna. When the second tuning switch is in a second mode, the isolation circuit does not access to the feeding network of the second antenna. Isolation of the first antenna and the second antenna in a preset band in the first mode is superior to that in the second mode.
    Type: Application
    Filed: July 28, 2019
    Publication date: February 20, 2020
    Inventor: Xiaojun Qiu
  • Publication number: 20200052383
    Abstract: Provided is an antenna system applied to a mobile terminal and including a back shell having a metal frame, a main board received in the back shell, an antenna unit provided between the back shell and the main board. The main board includes a front surface facing towards the antenna unit and a back surface arranged opposite to and spaced apart from the front surface. The mobile terminal includes a first metal ground layer and a first electrode plate provided on the front surface, a second metal ground layer and a second electrode plate provided on the back surface. The first electrode plate and the second electrode plate are spaced apart from the first and second metal ground layer, and connected to the antenna unit and the metal frame. The first and second electrode plates are arranged opposite to and spaced apart from each other to form a capacitor structure.
    Type: Application
    Filed: July 30, 2019
    Publication date: February 13, 2020
    Inventor: Xiaojun Qiu
  • Patent number: 8731910
    Abstract: The invention provides a compensation method for audio frame loss in a MDCT domain, the method comprising: when a frame currently lost is a Pth frame, obtaining a set of frequencies to be predicted, and for each frequency in the set, using phases and amplitudes of a plurality of frames before a (P?1)th frame in a MDCT-MDST domain to predict a phase and an amplitude of the Pth frame, and using the predicted phase and amplitude to obtain a MDCT coefficient of the Pth frame at each corresponding frequency; for a frequency outside the set, using MDCT coefficients of a plurality of frames before the Pth frame to calculate a MDCT coefficient value of the Pth frame at the frequency; performing an IMDCT for the MDCT coefficients of the Pth frame to obtain a time domain signal of the Pth frame.
    Type: Grant
    Filed: February 25, 2010
    Date of Patent: May 20, 2014
    Assignee: ZTE Corporation
    Inventors: Ming Wu, Zhibin Lin, Ke Peng, Zheng Deng, Jing Lu, Xiaojun Qiu, Jiali Li, Guoming Chen, Hao Yuan, Kaiwen Liu
  • Patent number: 8694325
    Abstract: A hierarchical audio coding, decoding method and system are provided. The method includes dividing frequency domain coefficients of an audio signal after MDCT into a plurality of coding sub-bands, quantizing and coding amplitude envelope values of coding sub-bands; allocating bits to each coding sub-band of the core layer, quantizing and coding core layer frequency domain coefficients to obtain coded bits of core layer frequency domain coefficients; calculating the amplitude envelope value of each coding sub-band of the core layer residual signal; allocating bits to each coding sub-band of the extended layer, quantizing and coding the extended layer coding signal to obtain coded bits of the extended layer coding signal; multiplexing and packing amplitude value envelope coded bits of each coding sub-band composed by core layer and extended layer frequency domain coefficients, core layer frequency coefficients coded bits, and extended layer coding signal coded bits, then transmitting to the decoding end.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: April 8, 2014
    Assignee: ZTE Corporation
    Inventors: Zhibin Lin, Zheng Deng, Hao Yuan, Jing Lu, Xiaojun Qiu, Jiali Li, Guoming Chen, Ke Peng, Kaiwen Liu
  • Publication number: 20120226505
    Abstract: A hierarchical audio coding, decoding method and system are provided. The method includes dividing frequency domain coefficients of an audio signal after MDCT into a plurality of coding sub-bands, quantizing and coding amplitude envelope values of coding sub-bands; allocating bits to each coding sub-band of the core layer, quantizing and coding core layer frequency domain coefficients to obtain coded bits of core layer frequency domain coefficients; calculating the amplitude envelope value of each coding sub-band of the core layer residual signal; allocating bits to each coding sub-band of the extended layer, quantizing and coding the extended layer coding signal to obtain coded bits of the extended layer coding signal; multiplexing and packing amplitude value envelope coded bits of each coding sub-band composed by core layer and extended layer frequency domain coefficients, core layer frequency coefficients coded bits, and extended layer coding signal coded bits, then transmitting to the decoding end.
    Type: Application
    Filed: October 26, 2010
    Publication date: September 6, 2012
    Applicant: ZTE CORPORATION
    Inventors: Zhibin Lin, Zheng Deng, Hao Yuan, Jing Lu, Xiaojun Qiu, Jiali Li, Guoming Chen, Ke Peng, Kaiwen Liu
  • Publication number: 20120109659
    Abstract: The invention provides a compensation method for audio frame loss in a MDCT domain, the method comprising: when a frame currently lost is a Pth frame, obtaining a set of frequencies to be predicted, and for each frequency in the set, using phases and amplitudes of a plurality of frames before a (P?1)th frame in a MDCT-MDST domain to predict a phase and an amplitude of the Pth frame, and using the predicted phase and amplitude to obtain a MDCT coefficient of the Pth frame at each corresponding frequency; for a frequency outside the set, using MDCT coefficients of a plurality of frames before the Pth frame to calculate a MDCT coefficient value of the Pth frame at the frequency; performing an IMDCT for the MDCT coefficients of the Pth frame to obtain a time domain signal of the Pth frame.
    Type: Application
    Filed: February 25, 2010
    Publication date: May 3, 2012
    Applicant: ZTE CORPORATION
    Inventors: Ming Wu, Zhibin Lin, Ke Peng, Zheng Deng, Jing Lu, Xiaojun Qiu, Jiali Li, Guoming Chen, Hao Yuan, Kaiwen Liu