Patents by Inventor Yen-Fang Chao
Yen-Fang Chao 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).
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Publication number: 20200358538Abstract: System and method for testing a wireless signal transceiver device under test (DUT) via a wireless signal path using one or more electromagnetic lenses to provide one or more focused electromagnetic test signals to a quiet zone region enveloping at least a portion of the DUT.Type: ApplicationFiled: May 9, 2019Publication date: November 12, 2020Inventors: Christian Volf Olgaard, Brad Robbins, Yen-Fang Chao
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Patent number: 10097282Abstract: System and method for providing variable time delays with high temporal granularity and consistent broadband delay performance for testing of time-of-arrival (ToA) or angle-of-arrival (AoA) performances of radio frequency (RF) signal transceivers. Multiple delays may be imparted to a common RF signal to provide multiple delayed RF signals corresponding to RF signals originating from a source location and received at various locations having respective position coordinates relative to respective orthogonal axes, plus another delayed RF signal corresponding to a RF signal originating from the source location and received at a location at an intersection of the orthogonal axes.Type: GrantFiled: January 26, 2018Date of Patent: October 9, 2018Assignee: LitePoint CorporationInventors: Yen-Fang Chao, Christian Volf Olgaard
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Patent number: 10090971Abstract: Various embodiments provide for systems and methods for signal conversion of one modulated signal to another modulated signal using demodulation and then re-modulation. According to some embodiments, a signal receiving system may comprise an I/Q demodulator that demodulates a first modulated signal to an in-phase (“I”) signal and a quadrature (“Q”) signal, an I/Q signal adjustor that adaptively adjusts the Q signal to increase the signal-to-noise ratio (SNR) of a transitory signal that is based on a second modulated signal, and an I/Q modulator that modulates the I signal and the adjusted Q signal to the second modulated signal. To increase the SNR, the Q signal may be adjusted based on a calculated error determined for the transitory signal during demodulation by a demodulator downstream from the I/Q modulator.Type: GrantFiled: November 7, 2017Date of Patent: October 2, 2018Assignee: Aviat U.S., Inc.Inventors: Emerick Vann, Yen-Fang Chao, Youming Qin, Roland Matian
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Publication number: 20180198573Abstract: Various embodiments provide for systems and methods for signal conversion of one modulated signal to another modulated signal using demodulation and then re-modulation. According to some embodiments, a signal receiving system may comprise an I/Q demodulator that demodulates a first modulated signal to an in-phase (“I”) signal and a quadrature (“Q”) signal, an I/Q signal adjustor that adaptively adjusts the Q signal to increase the signal-to-noise ratio (SNR) of a transitory signal that is based on a second modulated signal, and an I/Q modulator that modulates the I signal and the adjusted Q signal to the second modulated signal. To increase the SNR, the Q signal may be adjusted based on a calculated error determined for the transitory signal during demodulation by a demodulator downstream from the I/Q modulator.Type: ApplicationFiled: November 7, 2017Publication date: July 12, 2018Applicant: Aviat U.S., Inc.Inventors: Emerick Vann, Yen-Fang Chao, Youming Qin, Roland Matian
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Patent number: 9923647Abstract: A method for enabling confirmation of expected phase shifts of radio frequency (RF) signals emitted from respective elements of an antenna array, such as a phased array antenna used for providing directional RF signal radiation patterns needed for beamforming. As a RF signal transmitted via an antenna element of the antenna array is shifted, e.g., stepped, in phase, the resulting received RF signal is monitored. Following detection of a phase shift, a sample of the received RF signal is captured and stored, e.g., for subsequent analysis, such as comparison with one or more expected signal phase differences to characterize the directivity of the transmitted signal.Type: GrantFiled: December 16, 2016Date of Patent: March 20, 2018Assignee: LitePoint CorporationInventors: Christian Volf Olgaard, Zhiyong Huang, Yen-Fang Chao, Roman Schilter, Stefan Kildegaard Klukowski
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Patent number: 9813198Abstract: Various embodiments provide for systems and methods for signal conversion of one modulated signal to another modulated signal using demodulation and then re-modulation. According to some embodiments, a signal receiving system may comprise an I/Q demodulator that demodulates a first modulated signal to an in-phase (“I”) signal and a quadrature (“Q”) signal, an I/Q signal adjustor that adaptively adjusts the Q signal to increase the signal-to-noise ratio (SNR) of a transitory signal that is based on a second modulated signal, and an I/Q modulator that modulates the I signal and the adjusted Q signal to the second modulated signal. To increase the SNR, the Q signal may be adjusted based on a calculated error determined for the transitory signal during demodulation by a demodulator downstream from the I/Q modulator.Type: GrantFiled: October 3, 2014Date of Patent: November 7, 2017Assignee: Aviat U.S., Inc.Inventors: Emerick Vann, Yen-Fang Chao, Youming Qin, Roland Matian
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Patent number: 9337965Abstract: Various embodiments provide for systems and methods for signal conversion of one modulated signal to another modulated signal using demodulation and then re-modulation. According to some embodiments, a signal receiving system may comprise an I/Q demodulator that demodulates a first modulated signal to an in-phase (“I”) signal and a quadrature (“Q”) signal, an I/Q signal adjustor that adaptively adjusts the Q signal to increase the signal-to-noise ratio (SNR) of a transitory signal that is based on a second modulated signal, and an I/Q modulator that modulates the I signal and the adjusted Q signal to the second modulated signal. To increase the SNR, the Q signal may be adjusted based on a calculated error determined for the transitory signal during demodulation by a demodulator downstream from the I/Q modulator.Type: GrantFiled: April 6, 2015Date of Patent: May 10, 2016Assignee: Aviat U.S., Inc.Inventors: Emerick Vann, Yen-Fang Chao, Youming Qin, Roland Matian
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Publication number: 20150215084Abstract: Various embodiments provide for systems and methods for signal conversion of one modulated signal to another modulated signal using demodulation and then re-modulation. According to some embodiments, a signal receiving system may comprise an I/Q demodulator that demodulates a first modulated signal to an in-phase (“I”) signal and a quadrature (“Q”) signal, an I/Q signal adjustor that adaptively adjusts the Q signal to increase the signal-to-noise ratio (SNR) of a transitory signal that is based on a second modulated signal, and an I/Q modulator that modulates the I signal and the adjusted Q signal to the second modulated signal. To increase the SNR, the Q signal may be adjusted based on a calculated error determined for the transitory signal during demodulation by a demodulator downstream from the I/Q modulator.Type: ApplicationFiled: April 6, 2015Publication date: July 30, 2015Applicant: Aviat U.S., Inc.Inventors: Emerick Vann, Yen-Fang Chao, Youming Qin, Roland Matian
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Patent number: 9077425Abstract: Various embodiments provide for systems and methods for signal conversion of one modulated signal to another modulated signal using demodulation and then re-modulation. According to some embodiments, a signal receiving system may comprise an I/Q demodulator that demodulates a first modulated signal to an in-phase (“I”) signal and a quadrature (“Q”) signal, an I/Q signal adjustor that adaptively adjusts the Q signal to increase the signal-to-noise ratio (SNR) of a transitory signal that is based on a second modulated signal, and an I/Q modulator that modulates the I signal and the adjusted Q signal to the second modulated signal. To increase the SNR, the Q signal may be adjusted based on a calculated error determined for the transitory signal during demodulation by a demodulator downstream from the I/Q modulator.Type: GrantFiled: January 14, 2014Date of Patent: July 7, 2015Assignee: Aviat U.S., Inc.Inventors: Emerick Vann, Yen-Fang Chao, Youming Qin, Roland Matian
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Patent number: 9042853Abstract: Various embodiments provide for systems and methods for signal conversion of one modulated signal to another modulated signal using demodulation and then re-modulation. According to some embodiments, a signal receiving system may comprise an I/Q demodulator that demodulates a first modulated signal to an in-phase (“I”) signal and a quadrature (“Q”) signal, an I/Q signal adjustor that adaptively adjusts the Q signal to increase the signal-to-noise ratio (SNR) of a transitory signal that is based on a second modulated signal, and an I/Q modulator that modulates the I signal and the adjusted Q signal to the second modulated signal. To increase the SNR, the Q signal may be adjusted based on a calculated error determined for the transitory signal during demodulation by a demodulator downstream from the I/Q modulator.Type: GrantFiled: January 14, 2014Date of Patent: May 26, 2015Assignee: Aviat U.S., Inc.Inventors: Emerick Vann, Yen-Fang Chao, Youming Qin, Roland Matian
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Publication number: 20150023456Abstract: Various embodiments provide for systems and methods for signal conversion of one modulated signal to another modulated signal using demodulation and then re-modulation. According to some embodiments, a signal receiving system may comprise an I/Q demodulator that demodulates a first modulated signal to an in-phase (“I”) signal and a quadrature (“Q”) signal, an I/Q signal adjustor that adaptively adjusts the Q signal to increase the signal-to-noise ratio (SNR) of a transitory signal that is based on a second modulated signal, and an I/Q modulator that modulates the I signal and the adjusted Q signal to the second modulated signal. To increase the SNR, the Q signal may be adjusted based on a calculated error determined for the transitory signal during demodulation by a demodulator downstream from the I/Q modulator.Type: ApplicationFiled: October 3, 2014Publication date: January 22, 2015Applicant: Aviat U.S., Inc.Inventors: Emerick Vann, Yen-Fang Chao, Youming Qin, Roland Matian
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Publication number: 20140128016Abstract: Various embodiments provide for systems and methods for signal conversion of one modulated signal to another modulated signal using demodulation and then re-modulation. According to some embodiments, a signal receiving system may comprise an I/Q demodulator that demodulates a first modulated signal to an in-phase (“I?) signal and a quadrature (“Q?) signal, an I/Q signal adjustor that adaptively adjusts the Q signal to increase the signal-to-noise ratio (SNR) of a transitory signal that is based on a second modulated signal, and an I/Q modulator that modulates the I signal and the adjusted Q signal to the second modulated signal. To increase the SNR, the Q signal may be adjusted based on a calculated error determined for the transitory signal during demodulation by a demodulator downstream from the I/Q modulator.Type: ApplicationFiled: January 14, 2014Publication date: May 8, 2014Applicant: AVIAT U.S., INC.Inventors: Emerick Vann, Yen-Fang Chao, Youming Qin, Roland Matian
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Patent number: 8630600Abstract: Various embodiments provide for systems and methods for signal conversion of one modulated signal to another modulated signal using demodulation and then re-modulation. According to some embodiments, a signal receiving system may comprise an I/Q demodulator that demodulates a first modulated signal to an in-phase (“I”) signal and a quadrature (“Q”) signal, an I/Q signal adjustor that adaptively adjusts the Q signal to increase the signal-to-noise ratio (SNR) of a transitory signal that is based on a second modulated signal, and an I/Q modulator that modulates the I signal and the adjusted Q signal to the second modulated signal. To increase the SNR, the Q signal may be adjusted based on a calculated error determined for the transitory signal during demodulation by a demodulator downstream from the I/Q modulator.Type: GrantFiled: September 26, 2012Date of Patent: January 14, 2014Assignee: Aviat U.S., Inc.Inventors: Emerick Vann, Yen-Fang Chao, Youming Qin, Roland Matian
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Patent number: 8200174Abstract: A power detection circuit is described that provides for a wide dynamic range power detection. In one embodiment, a system comprises a transmitter, a diplexer, an antenna, a detector module, a signal converter and a microprocessor. The transmitter may be configured to transmit an output signal. The diplexer electrically may be coupled to the transmitter and may be configured to provide the output signal. The antenna may be electrically coupled to the diplexer and may be configured to transmit the output signal from the diplexer. The detector module may be electrically coupled to the diplexer and the antenna. The detector module may be configured to detect a power level of the output signal. The signal converter may be electrically coupled to the detector module. The signal converter may be configured to convert the output signal to a digital signal. The microprocessor may be electrically coupled to the signal converter.Type: GrantFiled: June 25, 2009Date of Patent: June 12, 2012Assignee: Harris Stratex Networks Operating CorporationInventors: Yen-Fang Chao, Cuong Nguyen
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Publication number: 20090323567Abstract: A power detection circuit is described that provides for a wide dynamic range power detection. In one embodiment, a system comprises a transmitter, a diplexer, an antenna, a detector module, a signal converter and a microprocessor. The transmitter may be configured to transmit an output signal. The diplexer electrically may be coupled to the transmitter and may be configured to provide the output signal. The antenna may be electrically coupled to the diplexer and may be configured to transmit the output signal from the diplexer. The detector module may be electrically coupled to the diplexer and the antenna. The detector module may be configured to detect a power level of the output signal. The signal converter may be electrically coupled to the detector module. The signal converter may be configured to convert the output signal to a digital signal. The microprocessor may be electrically coupled to the signal converter.Type: ApplicationFiled: June 25, 2009Publication date: December 31, 2009Applicant: Harris Stratex Networks Operating CorporationInventors: Yen-Fang Chao, Cuong Nguyen
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Patent number: 7592887Abstract: Waveguide flanges for joining waveguide sections or components are designed to achieve mechanical strength and exhibit desired electrical properties such as relatively low insertion loss and high return loss. The present invention contemplates waveguide interfaces with a new choke flange designed to engage with a shield flange and provide a joint with improved electrical properties. The new choke designs produce a virtual continuity through the waveguide joints and minimize electrical energy leakage. The electrical and mechanical properties of the joint in the waveguide interfaces are robust and able to tolerate lower levels of parts precision, imperfect mating of the flanges without metal-to-metal contact and gaps up to 0.06? or more between the mating flange surfaces.Type: GrantFiled: June 30, 2006Date of Patent: September 22, 2009Assignee: Harris Stratex Networks Operating CorporationInventors: Yen-Fang Chao, Bruce Corkill, Eric Tiongson, John Ruiz
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Patent number: 7555270Abstract: Power detection system and method provide for a wide dynamic range power detection. The system may incorporate a coupler to sample a transmitted or received power. Such sampled power is then directed to a detector configured to generate a voltage from its rectified current. Such voltage after optional filtering and buffering is directed to multiple amplifiers wherein each amplifier has a distinct associated gain. For improved noise immunity, a differential output amplifier may be used. For low power levels, the output of an amplifier with a large gain is directed to an analog-to-digital converter (ADC), wherein the analog voltage is quantized into a digital value. As power is increased, the output of an amplifier stage with a smaller gain can then be directed to the ADC such that saturation of the ADC is avoided. Hysteresis is implemented so to avoid undesirable and unnecessary rapid switching.Type: GrantFiled: February 26, 2007Date of Patent: June 30, 2009Assignee: Harris Stratex Networks Operating CorporationInventors: Yen-Fang Chao, Cuong Nguyen
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Patent number: 7414424Abstract: Power measurement and control in transmission systems are affected by changes in load conditions. A method and system are provided for detecting and controlling power levels independent of such load conditions.Type: GrantFiled: November 7, 2006Date of Patent: August 19, 2008Assignee: Harris Stratex Networks Operating CorporationInventors: Yen-Fang Chao, Cuong Nguyen, Roland Matian
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Publication number: 20080001686Abstract: Waveguide flanges for joining waveguide sections or components are designed to achieve mechanical strength and exhibit desired electrical properties such as relatively low insertion loss and high return loss. The present invention contemplates waveguide interfaces with a new choke flange designed to engage with a shield flange and provide a joint with improved electrical properties. The new choke designs produce a virtual continuity through the waveguide joints and minimize electrical energy leakage. The electrical and mechanical properties of the joint in the waveguide interfaces are robust and able to tolerate lower levels of parts precision, imperfect mating of the flanges without metal-to-metal contact and gaps up to 0.06? or more between the mating flange surfaces.Type: ApplicationFiled: June 30, 2006Publication date: January 3, 2008Inventors: Yen-Fang Chao, Bruce Corkill, Eric Tiongson, John Ruiz
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Publication number: 20070142006Abstract: Power detection system and method provide for a wide dynamic range power detection. The system may incorporate a coupler to sample a transmitted or received power. Such sampled power is then directed to a detector configured to generate a voltage from its rectified current. Such voltage after optional filtering and buffering is directed to multiple amplifiers wherein each amplifier has a distinct associated gain. For improved noise immunity, a differential output amplifier may be used. For low power levels, the output of an amplifier with a large gain is directed to an analog-to-digital converter (ADC), wherein the analog voltage is quantized into a digital value. As power is increased, the output of an amplifier stage with a smaller gain can then be directed to the ADC such that saturation of the ADC is avoided. Hysteresis is implemented so to avoid undesirable and unnecessary rapid switching.Type: ApplicationFiled: February 26, 2007Publication date: June 21, 2007Applicant: Harris Stratex Networks Operating Corporation (formerly Stratex Networks, Inc. )Inventors: Yen-Fang Chao, Cuong Nguyen