Patents by Inventor Thomas Bachman
Thomas Bachman 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: 20110169943Abstract: A system, method and computer program product provides for avoiding collision between a vehicle and a target object. Pluralities of images from the target object are sensed. Pluralities of polarized images are generated from the sensed images. One or more composite images are calculated from the two or more polarized images by performing an algebraic manipulation between the two or more polarized images. The target object is tracked based on composite images. A set of evasive maneuver instructions are established for the respective hazard associated with the target object.Type: ApplicationFiled: February 6, 2008Publication date: July 14, 2011Applicant: AAI CorporationInventors: Thomas A. Bachman, II, Kirk A. Slenker
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Patent number: 7259630Abstract: A predistorer configured for use with an RF power amplifier having an input loop configured to be coupled to the input of the RF power amplifier and peak control circuit. Such an input loop includes a look-up table containing predistortion values to be applied to an input signal, in response to the power in the input signal, for forming a predistorted input signal. The predistorter may further include an output loop, such an output loop configured to measure an intermodulation distortion product of the RF power amplifier output resulting from the predistorted input signal, and operable to update the predistortion values in the look-up table. Such a peak control circuit configured to select a power supply voltage for the RF power amplifier in response to the power in the input signal.Type: GrantFiled: July 23, 2003Date of Patent: August 21, 2007Assignee: Andrew CorporationInventors: Thomas A. Bachman, II, Breck W. Lovinggood
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Patent number: 7167693Abstract: A feed forward power amplifier system and method identify active channels across a frequency band to suppress unwanted intermodulation distortion (IMD) products in a communications signal such as a single- or multi-carrier communications signal. A scanning receiver identifies at least one active channel in a frequency band, and identifies at least one portion of the frequency band likely to include IMD products based upon the identified active channel(s). Based upon the identified portion of the frequency band, IMD products are suppressed from the communications signal, e.g., by controlling the magnitude and/or phase of a suppression signal mixed with the communications signal.Type: GrantFiled: September 16, 2004Date of Patent: January 23, 2007Assignee: Andrew CorporationInventors: Thomas A. Bachman, II, Robert W. Kooker, Paul E. White, Paul Everline, Robert Snyder, David M. January, Leonard Sarver, Philip Shenenberger
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Publication number: 20060175252Abstract: A two-phase anaerobic treatment system and method for the treatment of wastewaters containing simple and complex organic constituents is provided wherein the complex organic constituents are broken down into simple organic constituents by acidogenic bacteria in a Phase One reactor and the simple organic constituents from the Phase One reactor are converted into biogas, mainly methane, in a Phase Two reactor by methanogenic bacteria. The method includes the steps of feeding wastewater to the Phase One reactor either in an intermittent batch mode or semi-continuous mode, and withdrawing effluent from the Phase One reactor preferably in a batch mode. Effluent from the Phase One reactor is fed to the Phase Two reactor in an intermittent batch mode while effluent from the Phase Two reactor is withdrawn in a batch mode. The method minimizes the transfer of suspended solids from the Phase One reactor to the Phase Two reactor.Type: ApplicationFiled: February 3, 2006Publication date: August 10, 2006Inventors: K.C. Upendrakumar, Thomas Bachman, Elizabeth Williams
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Patent number: 6937482Abstract: A power feedforward amplifier uses integral cavities to provide RF isolation between subcircuits of the power amplifier. The chassis includes a main chassis body and a lid structure adapted to couple with the chassis body and define the subcircuit cavities. The inner lid includes an amplifier dividing wall and interstage walls adapted to isolate the main and error amplifier subcircuits of the feedforward power amplifier and further to isolate individual components of the subcircuits. In one embodiment, the amplifier subcircuits are mounted on a single circuit board and isolated from each other by the dividing wall. A delay line subcircuit portion is integral with the main chassis body and is coupled beneath the error amplifier subcircuit to contain and electromagnetically shield a delay line filter subcircuit while providing direct connection with the error amplifier.Type: GrantFiled: December 11, 2003Date of Patent: August 30, 2005Assignee: Andrew CorporationInventors: Robert W. Kooker, Paul E. White, Thomas A. Bachman, II
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Publication number: 20050032485Abstract: A feed forward power amplifier system and method identify active channels across a frequency band to suppress unwanted intermodulation distortion (IMD) products in a communications signal such as a single- or multi-carrier communications signal. A scanning receiver identifies at least one active channel in a frequency band, and identifies at least one portion of the frequency band likely to include IMD products based upon the identified active channel(s). Based upon the identified portion of the frequency band, IMD products are suppressed from the communications signal, e.g., by controlling the magnitude and/or phase of a suppression signal mixed with the communications signal.Type: ApplicationFiled: September 16, 2004Publication date: February 10, 2005Applicant: Andrew CorporationInventors: Thomas Bachman, Robert Kooker, Paul White, Paul Everline, Robert Snyder, David January, Leonard Sarver, Philip Shenenberger
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Publication number: 20050017801Abstract: A predistorer configured for use with an RF power amplifier having an input loop configured to be coupled to the input of the RF power amplifier and peak control circuit. Such an input loop includes a look-up table containing predistortion values to be applied to an input signal, in response to the power in the input signal, for forming a predistorted input signal. The predistorter may further include an output loop, such an output loop configured to measure an intermodulation distortion product of the RF power amplifier output resulting from the predistorted input signal, and operable to update the predistortion values in the look-up table. Such a peak control circuit configured to select a power supply voltage for the RF power amplifier in response to the power in the input signal.Type: ApplicationFiled: July 23, 2003Publication date: January 27, 2005Applicant: Andrew CorporationInventors: Thomas Bachman, Breck Lovinggood
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Patent number: 6844863Abstract: An antenna has multiple arrays of radiating elements and includes a plurality of single channel power amplifiers, with each amplifier electrically connected with an array. The radiating elements of the arrays are interleaved so that radiation from the arrays combines at a distance from the antenna.Type: GrantFiled: September 27, 2002Date of Patent: January 18, 2005Assignee: Andrew CorporationInventors: Mano D. Judd, Thomas A. Bachman, II
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Patent number: 6829471Abstract: A power amplifier system and method for locating carrier frequencies across a frequency band, identifying the modulation format of each carrier, and locating and suppressing undesired intermodulation distortion (IMD) products generated by the power amplifier. The system includes an amplifier for amplifying RF carrier signals in a main signal path, a variable phase shifter and variable attenuator on a feed forward path, and a tunable receiver that digitizes a portion of the frequency band to baseband. The tunable receiver includes a tunable voltage controlled oscillator which provides an oscillating frequency to a mixer and is phase-locked to a highly stable reference oscillator. The mixer downconverts a desired RF based on the oscillating frequency to IF. A filter passes only a selected portion of the IF signals, and the filter has a passband sufficient to discern both narrowband and wideband carriers and their associated IMD products.Type: GrantFiled: March 6, 2002Date of Patent: December 7, 2004Assignee: Andrew CorporationInventors: Paul E. White, Thomas A. Bachman, II, Robert W. Kooker, Leonard Sarver, Robert Snyder, Paul Everline
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Patent number: 6760230Abstract: A power feedforward amplifier uses integral cavities to provide RF isolation between subcircuits of the power amplifier. The chassis includes a main chassis body and a lid structure adapted to couple with the chassis body and define the subcircuit cavities. The inner lid includes an amplifier dividing wall and interstage walls adapted to isolate the main and error amplifier subcircuits of the feedforward power amplifier and further to isolate individual components of the subcircuits. In one embodiment, the amplifier subcircuits are mounted on a single circuit board and isolated from each other by the dividing wall. A delay line subcircuit portion is integral with the main chassis body and is coupled beneath the error amplifier subcircuit to contain and electromagnetically shield a delay line filter subcircuit while providing direct connection with the error amplifier.Type: GrantFiled: February 26, 2002Date of Patent: July 6, 2004Assignee: Andrew CorporationInventors: Robert W. Kooker, Paul E. White, Thomas A. Bachman, II
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Publication number: 20040120132Abstract: A power feedforward amplifier uses integral cavities to provide RF isolation between subcircuits of the power amplifier. The chassis includes a main chassis body and a lid structure adapted to couple with the chassis body and define the subcircuit cavities. The inner lid includes an amplifier dividing wall and interstage walls adapted to isolate the main and error amplifier subcircuits of the feedforward power amplifier and further to isolate individual components of the subcircuits. In one embodiment, the amplifier subcircuits are mounted on a single circuit board and isolated from each other by the dividing wall. A delay line subcircuit portion is integral with the main chassis body and is coupled beneath the error amplifier subcircuit to contain and electromagnetically shield a delay line filter subcircuit while providing direct connection with the error amplifier.Type: ApplicationFiled: December 11, 2003Publication date: June 24, 2004Applicant: Andrew CorporationInventors: Robert W. Kooker, Paul E. White, Thomas A. Bachman
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Publication number: 20040066333Abstract: An antenna has multiple arrays of radiating elements and includes a plurality of single channel power amplifiers, with each amplifier electrically connected with an array. The radiating elements of the arrays are interleaved so that radiation from the arrays combines at a distance from the antenna.Type: ApplicationFiled: September 27, 2002Publication date: April 8, 2004Applicant: Andrew CorporationInventors: Mano D. Judd, Thomas A. Bachman
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Patent number: 6677823Abstract: An automatic gain compensation circuit for actively adjusting the gain of an amplifier caused by in-loop and/or out-of-loop influences on system gain. Two matched RF detectors convert pre- and post-amplified signals to input and output voltages representative of the power of the RF signals. A gain control circuit which may include a Digital Analog Converter (DAC) utilizes an offset voltage that is weighted along with the input and output voltages to produce an error voltage. The error voltage is used to drive a voltage-controlled attenuator within the amplification path. Operational amplifiers may be used in the weighting circuits for weighting the input, output, and offset voltages in order to prevent loading of the RF detector outputs and to obtain rapid settling time. During amplifier operation, the offset voltage is adjusted by a processing unit to compensate for gain changes in the amplifier due to out-of-loop temperature-related influences on system gain.Type: GrantFiled: February 27, 2002Date of Patent: January 13, 2004Assignee: Andrew CorporationInventors: Jason Terosky, Anthony Chandler, Paul E. White, Thomas A. Bachman, II
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Publication number: 20020158688Abstract: An automatic gain compensation circuit for actively adjusting the gain of an amplifier caused by in-loop and/or out-of-loop influences on system gain. Two matched RF detectors convert pre- and post-amplified signals to input and output voltages representative of the power of the RF signals. A gain control circuit which may include a Digital Analog Converter (DAC) utilizes an offset voltage that is weighted along with the input and output voltages to produce an error voltage. The error voltage is used to drive a voltage-controlled attenuator within the amplification path. Operational amplifiers may be used in the weighting circuits for weighting the input, output, and offset voltages in order to prevent loading of the RF detector outputs and to obtain rapid settling time. During amplifier operation, the offset voltage is adjusted by a processing unit to compensate for gain changes in the amplifier due to out-of-loop temperature-related influences on system gain.Type: ApplicationFiled: February 27, 2002Publication date: October 31, 2002Inventors: Jason Terosky, Anthony Chandler, Paul E. White, Thomas A. Bachman
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Publication number: 20020146996Abstract: A feed forward power amplifier system and method identify active channels across a frequency band to suppress unwanted intermodulation distortion (IMD) products in a communications signal such as a single- or multi-carrier communications signal. A scanning receiver identifies at least one active channel in a frequency band, and identifies at least one portion of the frequency band likely to include IMD products based upon the identified active channel(s). Based upon the identified portion of the frequency band, IMD products are suppressed from the communications signal, e.g., by controlling the magnitude and/or phase of a suppression signal mixed with the communications signal.Type: ApplicationFiled: March 5, 2002Publication date: October 10, 2002Inventors: Thomas A. Bachman, Robert W. Kooker, Paul E. White, Paul Everline, Robert Snyder, David M. January, Leonard Sarver, Philip Shenenberger
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Publication number: 20020127986Abstract: A power amplifier system and method for locating carrier frequencies across a frequency band, identifying the modulation format of each carrier, and locating and suppressing undesired intermodulation distortion (IMD) products generated by the power amplifier. The system includes an amplifier for amplifying RF carrier signals in a main signal path, a variable phase shifter and variable attenuator on a feed forward path, and a tunable receiver that digitizes a portion of the frequency band to baseband. The tunable receiver includes a tunable voltage controlled oscillator which provides an oscillating frequency to a mixer and is phase-locked to a highly stable reference oscillator. The mixer downconverts a desired RF based on the oscillating frequency to IF. A filter passes only a selected portion of the IF signals, and the filter has a passband sufficient to discern both narrowband and wideband carriers and their associated IMD products.Type: ApplicationFiled: March 6, 2002Publication date: September 12, 2002Inventors: Paul E. White, Thomas A. Bachman, Robert W. Kooker, Leonard Sarver, Robert Snyder, Paul Everline
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Publication number: 20020118521Abstract: A power feedforward amplifier uses integral cavities to provide RF isolation between subcircuits of the power amplifier. The chassis includes a main chassis body and a lid structure adapted to couple with the chassis body and define the subcircuit cavities. The inner lid includes an amplifier dividing wall and interstage walls adapted to isolate the main and error amplifier subcircuits of the feedforward power amplifier and further to isolate individual components of the subcircuits. In one embodiment, the amplifier subcircuits are mounted on a single circuit board and isolated from each other by the dividing wall. A delay line subcircuit portion is integral with the main chassis body and is coupled beneath the error amplifier subcircuit to contain and electromagnetically shield a delay line filter subcircuit while providing direct connection with the error amplifier.Type: ApplicationFiled: February 26, 2002Publication date: August 29, 2002Inventors: Robert W. Kooker, Paul E. White, Thomas A. Bachman