Patents by Inventor Yijun Zhou

Yijun Zhou 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: 9531061
    Abstract: An electronic device may be provided with an antenna. The antenna may have an antenna resonating element and an antenna ground. An adjustable inductor may be coupled between the antenna resonating element and the antenna ground. An antenna feed may have a positive feed terminal coupled to the antenna resonating element and a ground antenna feed coupled to the antenna ground. The adjustable inductor may have first and second inductors coupled to respective first and second ports of a switch. The switch may have a third port coupled to the antenna ground. A capacitor may have a first terminal coupled to ground and a second terminal coupled to the first inductor at the first port of the switch. An inductor may be coupled between the antenna resonating element and antenna ground at a location between the adjustable inductor and the antenna feed.
    Type: Grant
    Filed: September 3, 2014
    Date of Patent: December 27, 2016
    Assignee: Apple Inc.
    Inventors: Liang Han, Matthew A. Mow, Ming-Ju Tsai, Yijun Zhou, Hongfei Hu, Salih Yarga, Mattia Pascolini, Yuehui Ouyang, Erdinc Irci, Enrique Ayala Vazquez, Robert W. Schlub
  • Patent number: 9499521
    Abstract: A compound having the following structure (I): or a pharmaceutically acceptable salt, prodrug, stereoisomer or tautomer thereof, is provided. Related compounds, methods for preparation of the same and uses of the compounds for treatment of various indications, including treatment of necrotic cell diseases and/or inflammation, are also provided.
    Type: Grant
    Filed: June 27, 2016
    Date of Patent: November 22, 2016
    Assignees: President and Fellows of Harvard College, Shanghai Institute of Organic Chemistry
    Inventors: Junying Yuan, Yijun Zhou, Shan Qian, Dawei Ma
  • Publication number: 20160304498
    Abstract: A compound having the following structure (I): or a pharmaceutically acceptable salt, prodrug, stereoisomer or tautomer thereof, is provided. Related compounds, methods for preparation of the same and uses of the compounds for treatment of various indications, including treatment of necrotic cell diseases and/or inflammation, are also provided.
    Type: Application
    Filed: June 27, 2016
    Publication date: October 20, 2016
    Inventors: Junying Yuan, Yijun Zhou, Shan Qian, Dawei Ma
  • Patent number: 9444425
    Abstract: An electronic device may be provided with wireless circuitry. Control circuitry may be used to adjust the wireless circuitry. The wireless circuitry may include antennas that are tuned, adjustable impedance matching circuitry, antenna port selection circuitry, and adjustable transceiver circuitry. Wireless circuit adjustments may be made by ascertaining a current usage scenario for the electronic device based on sensor data, information from cellular base station equipment or other external equipment, signal-to-noise ratio information or other signal information, antenna impedance measurements, and other information about the operation of the electronic device.
    Type: Grant
    Filed: June 20, 2014
    Date of Patent: September 13, 2016
    Assignee: Apple Inc.
    Inventors: Matthew A. Mow, Thomas E. Biedka, Liang Han, Ming-Ju Tsai, James G. Judkins, Enrique Ayala Vazquez, Jayesh Nath, Hongfei Hu, Nanbo Jin, Hao Xu, Yijun Zhou, Yuehui Ouyang, Victor Lee, Mattia Pascolini, Ruben Caballero
  • Publication number: 20160211570
    Abstract: Electronic devices may be provided that contain wireless communications circuitry. The wireless communications circuitry may include radio-frequency transceiver circuitry and antenna structures. The antenna structures may form a dual arm inverted-F antenna. The antenna may have a resonating element formed from portions of a peripheral conductive electronic device housing member and may have an antenna ground that is separated from the antenna resonating element by a gap. A short circuit path may bridge the gap. An antenna feed may be coupled across the gap in parallel with the short circuit path. Low band tuning may be provided using an adjustable inductor that bridges the gap. The antenna may have a slot-based parasitic antenna resonating element with a slot formed between portions of the peripheral conductive electronic device housing member and the antenna ground. An adjustable capacitor may bridge the slot to provide high band tuning.
    Type: Application
    Filed: March 30, 2016
    Publication date: July 21, 2016
    Inventors: Nanbo Jin, Yuehui Ouyang, Yijun Zhou, Enrique Ayala Vazquez, Anand Lakshmanan, Robert W. Schlub, Mattia Pascolini, Matthew A. Mow
  • Publication number: 20160168128
    Abstract: A compound having the following structure (I): or a pharmaceutically acceptable salt, prodrug, stereoisomer or tautomer thereof, is provided. Related compounds, methods for preparation of the same and uses of the compounds for treatment of various indications, including treatment of necrotic cell diseases and/or inflammation, are also provided.
    Type: Application
    Filed: December 11, 2015
    Publication date: June 16, 2016
    Inventors: Junying YUAN, Yijun ZHOU, Shan QIAN, Dawei MA
  • Patent number: 9331397
    Abstract: Electronic devices may be provided that contain wireless communications circuitry. The wireless communications circuitry may include radio-frequency transceiver circuitry and antenna structures. The antenna structures may form a dual arm inverted-F antenna. The antenna may have a resonating element formed from portions of a peripheral conductive electronic device housing member and may have an antenna ground that is separated from the antenna resonating element by a gap. A short circuit path may bridge the gap. An antenna feed may be coupled across the gap in parallel with the short circuit path. Low band tuning may be provided using an adjustable inductor that bridges the gap. The antenna may have a slot-based parasitic antenna resonating element with a slot formed between portions of the peripheral conductive electronic device housing member and the antenna ground. An adjustable capacitor may bridge the slot to provide high band tuning.
    Type: Grant
    Filed: March 18, 2013
    Date of Patent: May 3, 2016
    Assignee: Apple Inc.
    Inventors: Nanbo Jin, Yuehui Ouyang, Yijun Zhou, Enrique Ayala Vazquez, Anand Lakshmanan, Robert W. Schlub, Mattia Pascolini, Matthew A. Mow
  • Publication number: 20160093955
    Abstract: An electronic device may have wireless circuitry with antennas. An antenna may have an inverted-F antenna resonating element, an antenna ground, and other resonating element structures. A tip of the antenna resonating element and the antenna ground may be separated by a peripheral housing gap filled with plastic. The antenna may be sensitive to capacitance changes induced by the presence of a user's hand overlapping the gap or other portions of the antenna. A hand capacitance sensing electrode may be mounted in the plastic of the gap or elsewhere in the vicinity of the antenna. A transmission line may couple the hand capacitance sensing electrode to the antenna to retune the antenna in the event that the user's hand overlaps the antenna.
    Type: Application
    Filed: September 29, 2014
    Publication date: March 31, 2016
    Inventors: Enrique Ayala Vazquez, Mattia Pascolini, Hongfei Hu, Erdinc Irci, Yuehui Ouyang, Jennifer M. Edwards, Jayesh Nath, Salih Yarga, Yijun Zhou, Hao Xu
  • Publication number: 20160064801
    Abstract: An electronic device may be provided with an antenna. The antenna may have an antenna resonating element and an antenna ground. An adjustable inductor may be coupled between the antenna resonating element and the antenna ground. An antenna feed may have a positive feed terminal coupled to the antenna resonating element and a ground antenna feed coupled to the antenna ground. The adjustable inductor may have first and second inductors coupled to respective first and second ports of a switch. The switch may have a third port coupled to the antenna ground. A capacitor may have a first terminal coupled to ground and a second terminal coupled to the first inductor at the first port of the switch. An inductor may be coupled between the antenna resonating element and antenna ground at a location between the adjustable inductor and the antenna feed.
    Type: Application
    Filed: September 3, 2014
    Publication date: March 3, 2016
    Inventors: Liang Han, Matthew A. Mow, Ming-Ju Tsai, Yijun Zhou, Hongfei Hu, Salih Yarga, Mattia Pascolini, Yuehui Ouyang, Erdinc Irci, Enrique Ayala Vazquez, Robert W. Schlub
  • Publication number: 20160064812
    Abstract: An electronic device may be provided with an antenna. The antenna may have an antenna resonating element and an antenna ground. The antenna resonating element may be formed from peripheral conductive housing structures. An audio jack or other connector may be mounted in an opening in the peripheral conductive housing structures. The audio jack may overlap the antenna ground. Contacts in the audio jack may be coupled to an interference mitigation circuit. The interference mitigation circuit may include capacitors coupled to the ground and inductors coupled between the contacts and the capacitors. Radio-frequency signal blocking inductors may be coupled between the interference mitigation circuit and respective ports in an audio circuit.
    Type: Application
    Filed: September 3, 2014
    Publication date: March 3, 2016
    Inventors: Liang Han, Ming-Ju Tsai, Matthew A. Mow, Yijun Zhou, Mattia Pascolini, Salih Yarga, Enrique Ayala Vazquez, Hongfei Hu, Xu Han, Robert W. Schlub
  • Patent number: 9236659
    Abstract: An electronic device may be provided with a housing. The housing may have a periphery that is surrounded by peripheral conductive structures such as a segmented peripheral metal member. A segment of the peripheral metal member may be separated from a ground by a slot. An antenna feed may have a positive antenna terminal coupled to the peripheral metal member and a ground terminal coupled to the ground and may feed both an inverted-F antenna structure that is formed from the peripheral metal member and the ground and a slot antenna structure that is formed from the slot. Control circuitry may tune the antenna by controlling adjustable components that are coupled to the peripheral metal member. The adjustable components may include adjustable inductors and adjustable capacitors.
    Type: Grant
    Filed: December 4, 2013
    Date of Patent: January 12, 2016
    Assignee: Apple Inc.
    Inventors: Enrique Ayala Vazquez, Hongfei Hu, Mattia Pascolini, Yuehui Ouyang, Yijun Zhou, Matthew A. Mow, Robert W. Schlub, Erdinc Irci, Salih Yarga, Ming-Ju Tsai, Liang Han, Thomas E. Biedka, Nicholas S. Reimnitz
  • Publication number: 20150372656
    Abstract: An electronic device may be provided with wireless circuitry. Control circuitry may be used to adjust the wireless circuitry. The wireless circuitry may include antennas that are tuned, adjustable impedance matching circuitry, antenna port selection circuitry, and adjustable transceiver circuitry. Wireless circuit adjustments may be made by ascertaining a current usage scenario for the electronic device based on sensor data, information from cellular base station equipment or other external equipment, signal-to-noise ratio information or other signal information, antenna impedance measurements, and other information about the operation of the electronic device.
    Type: Application
    Filed: June 20, 2014
    Publication date: December 24, 2015
    Inventors: Matthew A. Mow, Thomas E. Biedka, Liang Han, Ming-Ju Tsai, James G. Judkins, Enrique Ayala Vazquez, Jayesh Nath, Hongfei Hu, Nanbo Jin, Hao Xu, Yijun Zhou, Yuehui Ouyang, Victor Lee, Mattia Pascolini, Ruben Caballero
  • Publication number: 20150357703
    Abstract: Electronic devices are provided that contain wireless communications circuitry. The wireless communications circuitry may include radio-frequency transceiver circuitry and antenna structures. An inverted-F antenna may have first and second short circuit legs and a feed leg. The first and second short circuit legs and the feed leg may be connected to a folded antenna resonating element arm. The antenna resonating element arm and the first short circuit leg may be formed from portions of a conductive electronic device bezel. The folded antenna resonating element arm may have a bend. The bezel may have a gap that is located at the bend. Part of the folded resonating element arm may be formed from a conductive trace on a dielectric member. A spring may be used in connecting the conductive trace to the electronic device bezel portion of the antenna resonating element arm.
    Type: Application
    Filed: August 19, 2015
    Publication date: December 10, 2015
    Inventors: Joshua G. Nickel, Juan Zavala, Yijun Zhou, Mattia Pascolini, Robert W. Schlub, Ruben Caballero
  • Publication number: 20150341073
    Abstract: An electronic device may be provided with wireless circuitry. Control circuitry may be used to adjust the wireless circuitry. The wireless circuitry may include an antenna that is tuned using tunable components. The control circuitry may gather information on the current operating mode of the. electronic device, sensor data from a proximity sensor, accelerometer, microphone, and other sensors, antenna impedance information for the antenna, and information on the use of connectors in the electronic device. Based on this gathered data, the control circuitry can adjust the tunable components to compensate for antenna detuning due to loading from nearby external objects, may adjust transmit power levels, and may make other wireless circuit adjustments.
    Type: Application
    Filed: May 20, 2014
    Publication date: November 26, 2015
    Applicant: Apple Inc.
    Inventors: Enrique Ayala Vazquez, Hongfei Hu, Mattia Pascolini, Yuehui Ouyang, Salih Yarga, Yijun Zhou, Erdinc lrci, Jayesh Nath, Ming-Ju Tsai, Matthew A. Mow, Liang Han, James G. Judkins, Robert W. Schlub
  • Publication number: 20150311579
    Abstract: Electronic device antenna structures may include first and second antennas. A housing may have a periphery that is surrounded by peripheral conductive structures such as a segmented peripheral metal member. A segment of the peripheral metal member may be separated from a ground by an opening. An antenna feed for the first antenna may have a positive antenna terminal coupled to the peripheral metal member and a ground terminal coupled to the ground. A return path for the first antenna may span the opening in parallel with the antenna feed. A plastic carrier may be mounted to a printed circuit and a metal housing structure using screws. The plastic carrier may support an antenna resonating element for the second antenna and may support the return path for the first antenna. The screws may short metal structures on the plastic carrier to the metal structures and traces on the printed circuit.
    Type: Application
    Filed: April 25, 2014
    Publication date: October 29, 2015
    Applicant: Apple Inc.
    Inventors: Erdinc Irci, Hongfei Hu, Mattia Pascolini, Yijun Zhou
  • Patent number: 9166634
    Abstract: Electronic devices may include antenna structures. The antenna structures may form an antenna having first and second feeds at different locations. A first transceiver may be coupled to the first feed using a first circuit. A second transceiver may be coupled to the second feed using a second circuit. The first and second feeds may be isolated from each other using the first and second circuits. The second circuit may have a notch filter that isolates the second feed from the first feed at operating frequencies associated with the first transceiver. The first circuit may include an adjustable component such as an adjustable capacitor. The adjustable component may be placed in different states depending on the mode of operation of the second transceiver to ensure that the first feed is isolated from the second feed.
    Type: Grant
    Filed: May 6, 2013
    Date of Patent: October 20, 2015
    Assignee: Apple Inc.
    Inventors: Dean F. Darnell, Enrique Ayala Vazquez, Hongfei Hu, Yuehui Ouyang, Mattia Pascolini, Robert W. Schlub, Peter Bevelacqua, Hao Xu, Jayesh Nath, Yijun Zhou, Nanbo Jin, David Pratt, Matthew A. Mow, Ming-Ju Tsai, Liang Han, Thomas E. Biedka
  • Patent number: 9160056
    Abstract: Electronic devices are provided that contain wireless communications circuitry. The wireless communications circuitry may include radio-frequency transceiver circuitry and antenna structures. An inverted-F antenna may have first and second short circuit legs and a feed leg. The first and second short circuit legs and the feed leg may be connected to a folded antenna resonating element arm. The antenna resonating element arm and the first short circuit leg may be formed from portions of a conductive electronic device bezel. The folded antenna resonating element arm may have a bend. The bezel may have a gap that is located at the bend. Part of the folded resonating element arm may be formed from a conductive trace on a dielectric member. A spring may be used in connecting the conductive trace to the electronic device bezel portion of the antenna resonating element arm.
    Type: Grant
    Filed: April 1, 2010
    Date of Patent: October 13, 2015
    Assignee: Apple Inc.
    Inventors: Josh Nickel, Juan Zavala, Yijun Zhou, Mattia Pascolini, Robert W. Schlub, Ruben Caballero
  • Patent number: 9153874
    Abstract: Electronic devices may include radio-frequency transceiver circuitry and antenna structures. The antenna structures may include an inverted-F antenna resonating element and an antenna ground that form an inverted-F antenna having first and second antenna ports. The antenna structures may include a slot antenna resonating element. The slot antenna resonating element may serve as a parasitic antenna resonating element for the inverted-F antenna at frequencies in a first communications band and may serve as a slot antenna at frequencies in a second communications band. The slot antenna may be directly fed using a third antenna port. An adjustable capacitor may be coupled to the first port to tune the inverted-F antenna. The inverted-F antenna may also be tuned using an adjustable capacitor bridging the slot antenna resonating element.
    Type: Grant
    Filed: March 18, 2013
    Date of Patent: October 6, 2015
    Assignee: Apple Inc.
    Inventors: Yuehui Ouyang, Nanbo Jin, Yijun Zhou, Enrique Ayala Vazquez, Anand Lakshmanan, Robert W. Schlub, Mattia Pascolini, Matthew A. Mow
  • Patent number: 8995926
    Abstract: Radio frequency test systems for characterizing antenna performance in various radio coexistence scenarios are provided. In one suitable arrangement, a test system may be used to perform passive radio coexistence characterization. During passive radio coexistence characterization, at least one signal generator may be used to feed aggressor signals directly to antennas within an electronic device under test (DUT). The aggressor signals may generate undesired interference signals in a victim frequency band, which can then be received and analyzed using a spectrum analyzer. During active radio coexistence characterization, at least one radio communications emulator may be used to communicate with a DUT via a first test antenna. While the DUT is communicating with the at least one radio communications emulator, test signals may also be conveyed between DUT 10 and a second test antenna. Test signals conveyed through the second test antenna may be used in obtaining signal interference level measurements.
    Type: Grant
    Filed: September 27, 2012
    Date of Patent: March 31, 2015
    Assignee: Apple Inc.
    Inventors: Matthew A. Mow, Thomas E. Biedka, Ming-Ju Tsai, Liang Han, Xu Han, Anand Lakshmanan, Nanbo Jin, Hongfei Hu, Dean F. Darnell, Joshua G. Nickel, Jayesh Nath, Yijun Zhou, Hao Xu, Yuehui Ouyang, Nirali Shah, Mattia Pascolini, Robert W. Schlub, Ruben Caballero
  • Publication number: 20140329558
    Abstract: Electronic devices may include antenna structures. The antenna structures may form an antenna having first and second feeds at different locations. A first transceiver may be coupled to the first feed using a first circuit. A second transceiver may be coupled to the second feed using a second circuit. The first and second feeds may be isolated from each other using the first and second circuits. The second circuit may have a notch filter that isolates the second feed from the first feed at operating frequencies associated with the first transceiver. The first circuit may include an adjustable component such as an adjustable capacitor. The adjustable component may be placed in different states depending on the mode of operation of the second transceiver to ensure that the first feed is isolated from the second feed.
    Type: Application
    Filed: May 6, 2013
    Publication date: November 6, 2014
    Applicant: Apple Inc.
    Inventors: Dean F. Darnell, Enrique Ayala Vazquez, Hongfei Hu, Yuehui Ouyang, Mattia Pascolini, Robert W. Schlub, Peter Bevelacqua, Hao Xu, Jayesh Nath, Yijun Zhou, Nanbo Jin, David Pratt, Matthew A. Mow, Ming-Ju Tsai, Liang Han, Thomas E. Biedka