With Waveguide Or Long Line Patents (Class 324/95)
  • Patent number: 10236553
    Abstract: A method for coupling dielectric waveguide cables is disclosed. The method comprises positioning a first dielectric waveguide cable and a second dielectric waveguide cable such that a first segment of the first dielectric waveguide cable and a second segment of the second dielectric waveguide cable are disposed side by side, generating an electromagnetic coupling between the first segment and the second segment, and transmitting an electromagnetic wave signal from the first dielectric waveguide cable to the second dielectric waveguide cable through the electromagnetic coupling.
    Type: Grant
    Filed: December 9, 2016
    Date of Patent: March 19, 2019
    Assignee: Tyco Electronics (Shanghai) Co. Ltd.
    Inventor: Liang Huang
  • Patent number: 9952297
    Abstract: A parallel plate waveguide forms a volume coil used for magnetic resonance imaging and spectroscopy. The waveguide includes a first conductor arranged on a first side of the waveguide and a second conductor arranged on a second side of the waveguide. Excitation of the first conductor and the second conductor creates a transverse electromagnetic field between the first conductor and the second conductor which causes a target within the volume coil to emit radio frequency signals used for producing an image of the target.
    Type: Grant
    Filed: May 7, 2015
    Date of Patent: April 24, 2018
    Assignee: AUBURN UNIVERSITY
    Inventor: Shumin Wang
  • Patent number: 9935218
    Abstract: A method for generating high power pulsed RF waveforms comprises the steps of charging a transmission line in a pulse forming network with a high-voltage and discharging the voltage on the transmission line to ground utilizing a gallium nitride photoconductive switch.
    Type: Grant
    Filed: January 2, 2015
    Date of Patent: April 3, 2018
    Assignee: BAE Systems Information and Electronic Systems Integreation Inc.
    Inventors: Alexander Kozyrev, John McGeehan, Yannick Morel
  • Patent number: 9921251
    Abstract: Disclosed is a radio frequency (RF) power calorimeter having a load electrically coupled to a RF input, a variable low-frequency power source electrically coupled to the load and configured to apply low-frequency bias to the load. The RF power calorimeter includes a thermal medium thermally coupled to the load. Additionally, the RF power calorimeter includes an outlet temperature sensor thermally coupled to the thermal medium, the outlet temperature sensor being positioned to measure the temperature of the thermal medium due to heating by the load. The RF power calorimeter also has circuitry configured to use temperature measurements of the thermal medium in thermal contact with an RF load in combination with the low-frequency bias to measure average power of an RF source electrically coupled to the RF input. Also disclosed in a method of measuring RF power using the RF power calorimeter.
    Type: Grant
    Filed: February 20, 2014
    Date of Patent: March 20, 2018
    Assignees: BIRD TECHNOLOGIES GROUP INC.
    Inventors: Joel D. Meltzer, Albert H. Titus, Bilel Neji, Jing Xu
  • Patent number: 9891251
    Abstract: Disclosed is a radio frequency (RF) power calorimeter having a load electrically coupled to a RF input, a variable low-frequency power source electrically coupled to the load and configured to apply low-frequency bias to the load. The RF power calorimeter includes a thermal medium thermally coupled to the load. Additionally, the RF power calorimeter includes an outlet temperature sensor thermally coupled to the thermal medium, the outlet temperature sensor being positioned to measure the temperature of the thermal medium due to heating by the load. The RF power calorimeter also has circuitry configured to use temperature measurements of the thermal medium in thermal contact with an RF load in combination with the low-frequency bias to measure average power of an RF source electrically coupled to the RF input. Also disclosed in a method of measuring RF power using the RF power calorimeter.
    Type: Grant
    Filed: February 20, 2014
    Date of Patent: February 13, 2018
    Assignees: BIRD TECHNOLOGIES GROUP INC.
    Inventors: Joel D. Meltzer, Albert H. Titus, Bilel Neji, Jing Xu
  • Patent number: 9882262
    Abstract: A domestic appliance includes at least one antenna which is integrated in a handle of the domestic appliance or arranged on a non-conductive wall region. The handle may constitute a door handle, or the at least one antenna may also be integrated in an additional handle of the domestic appliance.
    Type: Grant
    Filed: July 23, 2012
    Date of Patent: January 30, 2018
    Assignee: BSH Hausgeräte GmbH
    Inventor: Matthias Sippel
  • Patent number: 9844100
    Abstract: A heater with reduced electromagnetic wave emissions, which has two heating elements separated by an insulating layer and receiving opposite-phase alternating current in a way that cancels out electromagnetic wave emissions.
    Type: Grant
    Filed: March 23, 2012
    Date of Patent: December 12, 2017
    Inventors: Raleigh C. Duncan, Andrew Kaps, Seunghoon Koh, Manyoung Kim
  • Patent number: 9711837
    Abstract: A multichannel dielectric wave guide includes a set of dielectric core members that have a length and a cross section shape that is approximately rectangular, The core members have a first dielectric constant value. A cladding surrounds the set of dielectric core members and has a second dielectric constant value that is lower than the first dielectric constant.
    Type: Grant
    Filed: April 2, 2013
    Date of Patent: July 18, 2017
    Assignee: Texas Instruments Incorporated
    Inventors: Robert Floyd Payne, Juan Alejandro Herbsommer, Gerd Schuppener
  • Patent number: 9698463
    Abstract: A power divider including an input port receiving an electrical power input, a coupled port transmitting a portion of the power input, and a transmitted port transferring a remaining portion of the power input from the input port. A first conductor produces an electrical field and electrically connects the input port to the transmitted port. And, a second conductor, disposed within electrical field of the first conductor, electrically connects to the coupled port, the second conductor. The first and second conductors are configured to be variably spaced to vary the coupling factor between the input and transmitted portions of the input power.
    Type: Grant
    Filed: August 28, 2015
    Date of Patent: July 4, 2017
    Assignee: John Mezzalingua Associates, LLC
    Inventors: Werner Wild, Ian J. Baker
  • Patent number: 9651576
    Abstract: A method and apparatus for non-intrusively measuring flowing currents and/or voltage on the inner conductor of a coaxial cable is introduced herein. In particular, a resultant low-impedance element is coupled concentrically to the shield at a desired insertion point of the coaxial cable. A pair of conductive leads provided by the resultant low-impedance element is thereafter monitored for derived flowing currents that are in direct proportion to but of opposite polarity to the current within the inner conductor of the coaxial cable.
    Type: Grant
    Filed: October 17, 2013
    Date of Patent: May 16, 2017
    Assignee: Thermo Keytek LLC
    Inventor: Marcos Hernandez
  • Patent number: 9508764
    Abstract: The invention relates to a device for detecting electromagnetic radiation in the THz frequency range, comprising at least one transistor (FET1, FET2), which has a first electrode, a second electrode, a control electrode, and a channel between the first electrode and the second electrode, and comprising an antenna structure. An electrode is connected to the antenna structure such that an electromagnetic signal which lies in the THz-frequency range and which is received by the antenna structure (1) can be fed into the channel between electrodes and the control electrode is connected to an electrode via a capacitor and/or the control electrode and the first electrode or the control electrode and the second electrode have an intrinsic capacitor such that no AC voltage drop occurs between the control electrode and the first electrode or the second electrode.
    Type: Grant
    Filed: May 31, 2012
    Date of Patent: November 29, 2016
    Assignee: Johann Wolfgang Goethe-Universitat Frankfurt a. M.
    Inventors: Sebastian Boppel, Alvydas Lisauskas, Hartmut Roskos, Viktor Krozer
  • Patent number: 9461755
    Abstract: Enhanced RF system measurement including measurement of reflected power of a transmission system using two directional couplers configured to couple reflected power (e.g., isolate forward power). The directional couplers may be placed at a distance of ¼ wave separation and measurements from the two directional couplers may be averaged to obtain a reflected power for the transmission path. The enhanced measurement of reflected power may be used to obtain a more accurate VSWR or return loss measurement. An indication of the reflected power (e.g., VSWR, return loss, etc.) may be fed back to a source, which may adjust transmit power based on the measured VSWR to achieve a certain amount of power conveyed to the load (e.g., target radiated power from an antenna, etc.). Error conditions may be detected and the source may terminate transmission to prevent potential adverse operating conditions.
    Type: Grant
    Filed: January 16, 2015
    Date of Patent: October 4, 2016
    Assignee: ViaSat, Inc.
    Inventors: Kenneth P. Brewer, Salah M. Osman
  • Patent number: 9406990
    Abstract: A waveguide assembly system includes a fixed port, a sliding port, and a transmission path from the fixed port to the sliding port. The transmission path includes a waveguide assembly that includes a first minor face corresponding to the fixed port, a first major face that includes a recess extending from the first minor surface towards the fixed port. The waveguide assembly system also includes a port assembly with a first major surface disposed opposite to the first major surface of the waveguide assembly. The port assembly includes at least one port having a first opening on the first major surface of the port assembly and a second opening on a second major surface of the port assembly. The port assembly includes one or more stubs positioned to impede electromagnetic energy propagation beyond a specified distance within the port tab assembly.
    Type: Grant
    Filed: January 20, 2015
    Date of Patent: August 2, 2016
    Assignee: Keyssa, Inc.
    Inventor: Eric Sweetman
  • Patent number: 9372248
    Abstract: A method is provided for evaluating the reliability of an electrical power measuring device for measuring high-frequency electrical power. To build an evaluation system, the measuring device, together with a reference electrical power measuring device, is arranged between a high-frequency power supply device and an artificial reproduction load, which includes an impedance conversion device and a reference load. Using this system, an uncertainty range of an electrical power measured value measured by the measuring device is calculated, according to a prescribed calculation formula, from the electrical power measured value, and a judgment is made as to whether or not the electrical power measured value measured by the measuring device is within the uncertainty range. If it is within the uncertainty range, the measuring device is evaluated as being reliable, while if it is not within the uncertainty range, the measuring device is evaluated as being unreliable.
    Type: Grant
    Filed: March 14, 2011
    Date of Patent: June 21, 2016
    Assignee: DAIHEN Corporation
    Inventor: Ryohei Tanaka
  • Patent number: 9332922
    Abstract: A device, method, and system for monitoring the status of an internal part of a body using an electromagnetic transceiver operating in the microwave regime; a processing unit compares measured data with reference data to determine the status of the internal part. The solution may be arranged to continuously monitor the internal part of the body and the system may be arranged so as to be wearable or portable.
    Type: Grant
    Filed: June 29, 2007
    Date of Patent: May 10, 2016
    Assignee: MEDFIELDS DIAGNOSTICS AB
    Inventors: Mikael Persson, Andreas Fhager
  • Patent number: 9234915
    Abstract: Apparatus are provided for use in testing circuit boards. A signal sensing device includes one or more probes. Each probe includes a length of rigid coaxial conductor configured to define a sensing pin at one end. A circuit board defines a number of through vias lined in metal and configured to receive the sensing pin of a corresponding probe. The signal sensing device also includes a ground pin. Electrical pathways extending away from adjacent pairs of the through vias can be tested for electrical impedance and other signal propagating characteristics by way of the signal sensing device.
    Type: Grant
    Filed: December 2, 2009
    Date of Patent: January 12, 2016
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Letha Rousseau, Richard Schumacher
  • Patent number: 9214718
    Abstract: A wireless electronic device may contain at least one antenna tuning element for use in tuning the operating frequency range of the device. The antenna tuning element may include radio-frequency switches, continuously/semi-continuously adjustable components such as tunable resistors, inductors, and capacitors, and other load circuits that provide desired impedance characteristics. A test station may be used to measure the radio-frequency characteristics associated with the tuning element. The test station may provide adjustable temperature, power, and impedance control to help emulate a true application environment for the tuning element without having to place the tuning element within an actual device during testing. The test system may include at least one signal generator and a tester for measuring harmonic distortion values and may include at least two signal generators and a tester for measuring intermodulation distortion values.
    Type: Grant
    Filed: March 8, 2012
    Date of Patent: December 15, 2015
    Assignee: Apple Inc.
    Inventors: Matthew A. Mow, Thomas E. Biedka, Liang Han, Rocco V. Dragone, Jr., Hongfei Hu, Dean F. Darnell, Joshua G. Nickel, Robert W. Schlub, Mattia Pascolini, Ruben Caballero
  • Patent number: 9157933
    Abstract: A test device for wireless electronic devices includes a metal casing, a RF-absorbing material, a measurement antenna, and an impedance adjustment module. The impedance adjustment module includes a dielectric layer, a microstrip line, and a slot line, wherein the slot line is electrically connected to the measurement antenna. The microstrip line and the slot line are disposed on two opposite sides of the dielectric layer and respectively include a first body and a second body, which are parallel to each other.
    Type: Grant
    Filed: January 7, 2013
    Date of Patent: October 13, 2015
    Assignee: Wistron NeWeb Corporation
    Inventors: Huang-Tse Peng, Chin-Lien Huang, Kuang-Yuan Ku
  • Patent number: 9083333
    Abstract: A switching circuit (80) includes: a plurality of insulated gate transistors (30-33) connected in parallel between a high voltage line (L1) and a low voltage line (L2); gate resistors (50-53) each provided for one of the plurality of insulated gate transistors (30-33) and each including a first terminal connected to a gate electrode of each of the insulated gate transistors (30-33); and a single gate voltage application unit (60) configured to apply pulsing gate voltage to the gate electrode of each of the insulated gate transistors (30-33) via the gate resistors (50-53). A second terminal of each of the gate resistors (50-53) provided for each of the plurality of insulated gate transistors (30-33) is connected to the gate voltage application unit (60) via a gate voltage apply line (L3), and a single capacitor is connected between the gate voltage apply line (L3) and the high voltage line (L1).
    Type: Grant
    Filed: May 30, 2012
    Date of Patent: July 14, 2015
    Assignee: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Naohito Kanie, Toshiaki Nagase
  • Patent number: 9000776
    Abstract: A method for estimating the characteristic impedance of a structure comprising the following steps: providing a current probe comprising a magnetic core having an aperture therein and a primary winding wrapped around the core; measuring, with a calibrated vector network analyzer (VNA), the impedance (Zop) of the current probe while in an open configuration wherein nothing but air occupies the aperture and the current probe is isolated from a ground; measuring, with the VNA, the impedance (Zsh) of the current probe while in a short configuration, wherein the current probe is electrically shorted; measuring, with the VNA, the impedance (Zin) of the current probe while the current probe is mounted to the structure such that the structure extends through the aperture; and calculating an estimated characteristic impedance (Z?mast) of the structure according to the following equation: Z?mast=(Zin?Zsh)(Zop?Zsh)/(Zop?Zin).
    Type: Grant
    Filed: December 9, 2010
    Date of Patent: April 7, 2015
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Daniel W. Tam, Randall A. Reeves, John H. Meloling
  • Patent number: 8970226
    Abstract: An RF current probe is encapsulated in a conductive housing to permit its placement inside a plasma reactor chamber. An RF voltage probe is adapted to have a long coaxial cable to permit a measuring device to be connected remotely from the probe without distorting the voltage measurement.
    Type: Grant
    Filed: July 17, 2013
    Date of Patent: March 3, 2015
    Assignee: Applied Materials, Inc.
    Inventors: Hiroji Hanawa, Satoru Kobayashi, Kartik Ramaswamy, Shahid Rauf
  • Patent number: 8963570
    Abstract: The invention relates to a contactless loop probe for the contactless decoupling of an HF signal for a contactless measuring system, comprising at least one coupling structure (10) and at least one first signal conductor (12) electrically connected to the coupling structure (10) by a first transition (20), said signal conductor being electrically connected by a second transition (22) to an output (14) for electrically connecting to the measuring system, wherein the coupling structure (10) is designed as an HF waveguide comprising at least one signal conductor (24; 30) and at least one reference conductor (26; 32).
    Type: Grant
    Filed: July 15, 2009
    Date of Patent: February 24, 2015
    Assignee: Rosenberger Hochfrequenztechnik GmbH & Co. KG
    Inventors: Thomas Zelder, Bernd Geck
  • Patent number: 8952678
    Abstract: In a gap-mode waveguide embodiment, an interior gap in a tubular waveguide principally condenses a dominant gap mode near the interior gap, and an absorber dissipates electromagnetic energy away from the gap mode. In this manner, the gap mode may dissipate relatively little power in the absorber compared to other modes and propagate with lesser attenuation than all other modes. A gap mode launched into a gap-mode waveguide may provide for low-loss, low-dispersion propagation of signals over a bandwidth including a multimode range of the waveguide. Gap-mode waveguide embodiments of various forms may be used to build guided-wave circuits covering broad bandwidths extending to terahertz frequencies.
    Type: Grant
    Filed: November 21, 2011
    Date of Patent: February 10, 2015
    Inventor: Kirk S. Giboney
  • Publication number: 20140239940
    Abstract: Disclosed is a radio frequency (RF) power calorimeter having a load electrically coupled to a RF input, a variable low-frequency power source electrically coupled to the load and configured to apply low-frequency bias to the load. The RF power calorimeter includes a thermal medium thermally coupled to the load. Additionally, the RF power calorimeter includes an outlet temperature sensor thermally coupled to the thermal medium, the outlet temperature sensor being positioned to measure the temperature of the thermal medium due to heating by the load. The RF power calorimeter also has circuitry configured to use temperature measurements of the thermal medium in thermal contact with an RF load in combination with the low-frequency bias to measure average power of an RF source electrically coupled to the RF input. Also disclosed in a method of measuring RF power using the RF power calorimeter.
    Type: Application
    Filed: February 20, 2014
    Publication date: August 28, 2014
    Inventors: Joel D. Meltzer, Albert H. Titus, Bilel Neji, Jing Xu
  • Patent number: 8816700
    Abstract: A partial discharge detection device for detecting and measuring partial discharges in electric systems or components, which delivers signals having a form much resembling that of the radiated pulse, for improved identification and analysis. The device is of small size, totally insulated and self-powered, and allows measurements to be performed with the highest safety with no need for direct connection, thereby allowing operators to stand at a distance and avoid any system shutdown while making measurements. Furthermore, it can also detect and deliver the sync signal, which is obtained by picking up the supply voltage of the discharge generating components.
    Type: Grant
    Filed: June 11, 2009
    Date of Patent: August 26, 2014
    Assignee: Prysmian S.p.A.
    Inventors: Antonio Di Stefano, Roberto Candela, Giuseppe Costantino Giaconia, Giuseppe Fiscelli
  • Patent number: 8803531
    Abstract: A method and arrangement for facilitating through-line mismatch RF testing using an air-isolated coaxial line having an inner conductor surrounded by a coaxial shielding. At least one circular opening is provided through the shielding. A radially adjustable piston is provided in each opening such that it is electrically connected to the shielding and such that its protrusion from an inside of the shielding towards the inner conductor is adjustable. The position of the radially adjustable piston is calibrated with a known level of RF mismatch so that a desired level of mismatch can be created through adjustment of the piston. By adjusting the piston so that it does not protrude beyond the inside of the shielding, the arrangement is effectively set to zero and does not have to be disconnected after use.
    Type: Grant
    Filed: November 27, 2008
    Date of Patent: August 12, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventor: Lars Arvidsson
  • Patent number: 8598866
    Abstract: A zero bias power detector comprising a zero bias diode and an output boost circuit is provided. The output boost circuit comprises a zero bias transistor. The zero bias diode is not biased but outputs a rectifying signal according to a wireless signal. The zero bias transistor, not biased but coupled to the zero bias diode, is used for enhancing the rectifying signal.
    Type: Grant
    Filed: November 29, 2010
    Date of Patent: December 3, 2013
    Assignee: Industrial Technology Research Institute
    Inventors: Chun-Yen Huang, Chin-Chung Nien, Jenn-Hwan Tarng, Chen-Ming Li, Li-Yuan Chang, Ya-Chung Yu
  • Publication number: 20130278241
    Abstract: This present inversion provides a digital closed-loop fiber optical current sensor. The modulation signal of the optical wave “phase modulator” of the fiber optical current sensor system is modulation square wave, signal processing system extracts any harmonic wave of the photoelectric converter output modulation square waves, and extracts the measured current information from it. The preamplifier of signal processing system is transimpedance amplifier TIA, the bandwidth is extracted 1/650 instantaneous amplitude square wave directly from the modulation square wave (existing), thus the thermal noise of the preamplifier output and shot noise level is reduced to the existing technology of below 1/650; the current-voltage gain of transimpedance amplifier TIA does not depend on the feedback network resistance, thus it can have high current-voltage conversion gain and use low resistance in the feedback network TIA at the same time.
    Type: Application
    Filed: May 10, 2011
    Publication date: October 24, 2013
    Applicant: China Electric Power Research Institute
    Inventors: Xiangxun Chen, Jianbo Guo, Ping Jing, Shuo Chen, Shujie Yin, Zhanyuan Liu
  • Patent number: 8558549
    Abstract: A detector circuit for detecting degradation in the distortion characteristics of a power amplifier based on signals from both ends of a coupled line of a directional coupler. The detector circuit includes a phase shifter/attenuator for phase shifting and attenuating a signal from a coupled terminal of the coupled line, a differential amplifier for outputting difference between an output signal from the phase shifter/attenuator and a signal from the isolated terminal of the coupled line, a wave detector circuit for converting the difference into a DC signal, and a comparing circuit for determining whether the voltage level of the DC signal exceeds a predetermined level. When degradation in the distortion characteristics of the power amplifier arises, the phase shifter/attenuator phase shifts the signal from the coupled terminal and outputs a signal 180° out of phase with the signal from the isolated terminal.
    Type: Grant
    Filed: November 8, 2010
    Date of Patent: October 15, 2013
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazuya Yamamoto, Tomoyuki Asada, Miyo Miyashita
  • Patent number: 8525521
    Abstract: A detector circuit for detecting degradation in the distortion characteristics of a power amplifier based on signals from both ends of a coupled line of a directional coupler. The detector circuit includes a phase shifter/attenuator for phase shifting and attenuating a signal from a coupled terminal of the coupled line, a differential amplifier for outputting difference between an output signal from the phase shifter/attenuator and a signal from the isolated terminal of the coupled line, a wave detector circuit for converting the difference into a DC signal, and a comparing circuit for determining whether the voltage level of the DC signal exceeds a predetermined level. When degradation in the distortion characteristics of the power amplifier arises, the phase shifter/attenuator phase shifts the signal from the coupled terminal and outputs a signal 180° out of phase with the signal from the isolated terminal.
    Type: Grant
    Filed: November 8, 2010
    Date of Patent: September 3, 2013
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazuya Yamamoto, Tomoyuki Asada, Miyo Miyashita
  • Patent number: 8456159
    Abstract: A stabilized field sensor apparatus collects field data, in particular magnetic field data, with reduced motion noise. The apparatus includes a tear drop shaped housing, a tow frame in the housing, a plurality of vibration isolating dampers spaced around the frame, a base assembly mounted to the dampers, a support pedestal having a bottom end fixed to the base assembly and an upper free end, a single spherical air bearing connected to the upper free end of the pedestal, an instrument platform with a lower hollow funnel having an upper inside apex supported on the air bearing for a one point support, principal and secondary gyro stabilizers for maintaining pivotal and rotational stability, and at least one field sensor mounted to the instrument platform for collecting the field data while being stabilized against motion noise including vibration, pivoting and rotation from the base assembly, from the tow frame and from the housing.
    Type: Grant
    Filed: January 15, 2010
    Date of Patent: June 4, 2013
    Assignee: Vale S.A.
    Inventors: Benjamin David Polzer, Gordon Fox West, Peter Whyte Walker, Peter Anthony Hurley, Robert Leslie Scott Hogg
  • Patent number: 8390493
    Abstract: A voltage reference circuit provides a precision voltage reference output without requiring a filter capacitor. The voltage reference output is generated by a digitally-controlled source, which has a value set by the output of a digital filter that filters the output of a comparison circuit that compares the voltage reference output to another reference. A selectable mode can be provided to provide a fast response during a startup/reset period and an optional hold or narrowband response after startup. The mode selection may also offer selection of an externally-supplied digital control value and/or a resistor divider type voltage reference as an alternative to the digitally-controlled source.
    Type: Grant
    Filed: June 30, 2010
    Date of Patent: March 5, 2013
    Assignee: Cirrus Logic, Inc.
    Inventors: Harish Raghavan, John Christopher Tucker, Scott Allan Woodford, Daniel John Allen, Anand Ilango
  • Patent number: 8378866
    Abstract: A heater controller for controlling a heater precisely in the equi-power mode is disclosed. The controller includes a current source, a voltage monitor to detect a voltage drop caused in the heater, and a controller. The voltage drop may be converted to the digital form as refereeing to the first reference, while, the heater current is converted from the digital form as referring to the second reference. The second reference shows substantial temperature dependence, while, the first reference has lesser temperature dependence. The control corrects the temperature dependence of the second reference as referring to the first reference.
    Type: Grant
    Filed: April 13, 2011
    Date of Patent: February 19, 2013
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Tomoko Ikagawa
  • Patent number: 8320719
    Abstract: A method is provided for tuning the fiber optic retarder of a fiber optic current sensor towards a desired temperature dependence, the sensing fiber is exposed to a magnetic field or corresponding electric current and the sensor signal as well as the signal's dependence on the retarder temperature are measured. From this initial sensor signal and its temperature dependence, a target sensor signal can be determined, at which the dependence on the retarder temperature equals a desired value. Then, the retarder is thermally treated until the sensor signal reaches the target value. The method obviates the need for repetitively measuring the temperature dependence during the tuning process.
    Type: Grant
    Filed: September 27, 2010
    Date of Patent: November 27, 2012
    Assignee: ABB Research Ltd
    Inventors: Robert Wueest, Andreas Frank, Klaus Bohnert, Philippe Gabus
  • Patent number: 8174253
    Abstract: Systems, methods and sensors detect changes in incident optical radiation. Voltage is applied across one or more active areas of a detector while the incident optical radiation illuminates the active areas. Current is sensed across one or more of the active areas, a change in the current being indicative of the changes in incident optical radiation.
    Type: Grant
    Filed: February 22, 2011
    Date of Patent: May 8, 2012
    Assignee: The Trustees of Dartmouth College
    Inventors: Elsa Garmire, Ashifi Gogo, Jonathan T. Bessette
  • Publication number: 20120091991
    Abstract: An electric measuring apparatus is constructed in such a way as to include a signal processing circuit equipped with at least a polarized light separating unit, Faraday rotators, a light source, a photoelectric conversion element, and optical fibers for a sensor. The optical fibers for the sensor are placed around the periphery of an electrical conductor through which electric current to be measured flows. Furthermore, the rotation angle of each Faraday rotator at the time when the magnetism of each Faraday rotator is saturated is set to 22.5°+?° at a temperature of 23° C., thereby changing the rotation angle of each Faraday rotator by ?° from 22.5°.
    Type: Application
    Filed: May 18, 2010
    Publication date: April 19, 2012
    Applicant: ADAMANT KOGYO CO., LTD.
    Inventors: Yoshihiro Konno, Masaru Sasaki
  • Patent number: 8049487
    Abstract: A power measurement circuit and method are described. The circuit comprises: a transconductance rectifier arrangement including an input and configured to receive a periodically varying input voltage signal having an approximate 50% duty cycle; and an averaging filter for producing a time averaged DC output signal proportional to the mean square of the voltage at the input of the transconductance rectifier arrangement and representative of the average power of the input voltage signal within a range of voltages at the input.
    Type: Grant
    Filed: December 18, 2008
    Date of Patent: November 1, 2011
    Assignee: Linear Technology Corporation
    Inventor: John P. Myers
  • Patent number: 8004269
    Abstract: The present invention relates to a radio frequency (RF) power measurement circuit that measures delivered power to a load. The RF power measurement circuit includes a measurement RF transmission line coupled to the load, and measurement and power calculation circuitry coupled to either end of the measurement RF transmission line to measure an RF input signal feeding the measurement RF transmission line and to measure an RF output signal fed from the measurement RF transmission line to the load. The measurement and power calculation circuitry uses the measured RF input and output signals to calculate and provide a delivered power signal that is indicative of the delivered power to the load.
    Type: Grant
    Filed: July 29, 2008
    Date of Patent: August 23, 2011
    Assignee: RF Micro Devices, Inc.
    Inventors: Marcelo J. Franco, Robert J. Baeten
  • Patent number: 7925229
    Abstract: A self-testing transceiver having an on-chip power detection capability is provided. The self-testing transceiver can include a semiconductor substrate and a transmitter having a high-power amplifier disposed on the substrate. The self-testing transceiver also can include a receiver disposed on the substrate for selectively coupling to an antenna. The self-testing transceiver can further include at least one power detector disposed on the semiconductor substrate for determining a power such as an RMS and/or peak-power of a signal at an internal node of the self-testing transceiver. Additionally, the self-testing transceiver can include a loopback circuit disposed on the substrate.
    Type: Grant
    Filed: April 25, 2008
    Date of Patent: April 12, 2011
    Assignee: University of Florida Research Foundation, Inc.
    Inventors: William R. Eisenstadt, Robert M. Fox, Jang Sup Yoon, Tao Zhang
  • Patent number: 7825850
    Abstract: It is proposed to use the gun barrel or launcher tube or the muzzle brake as a waveguide, which, however, is operated at a frequency that is below the cutoff frequency of the relevant waveguide mode. The transmit coupler excites the relevant waveguide mode. An oscillator generates the signal, which is then sent to the transmit coupler. The waveguide and the projectile form a system in which the electromagnetic field at the receive coupler is influenced by the position of the projectile. The characteristic change over time of the strength of the electromagnetic field at the location of the receive coupler that results from the change in the distance between the projectile and the receive coupler is measured and used to determine the muzzle velocity.
    Type: Grant
    Filed: December 10, 2007
    Date of Patent: November 2, 2010
    Assignee: Oerlikon Contraves AG
    Inventor: Henry Frick
  • Patent number: 7821250
    Abstract: A clamp assembly for bringing an RF sensor into electrical contact with an RF current carrier is provided herein. The clamp assembly (101) comprises a first wedge-shaped element (103), and a second wedge-shaped element (105) which is slidingly engaged with said first wedge-shaped element. Preferably, the clamp assembly also comprises a collar (113) within which the first and second wedge-shaped elements are disposed. The clamp assembly preferably further comprises a fastener (111), such as a screw, which adjoins the first and second elements, in which case the clamp assembly is adapted such that, as the screw is rotated in a first direction, at least one of the first and second elements expands against the collar and/or the RF current carrier.
    Type: Grant
    Filed: July 31, 2006
    Date of Patent: October 26, 2010
    Assignee: Inficon, Inc.
    Inventors: Terry A. Turner, Rodney A. Herman, Duane T. Smith, James D. Spain
  • Patent number: 7812594
    Abstract: An optical device includes an optical element, a detector and a controller. The optical element has an optical waveguide. Refractive index of the optical waveguide is controlled by a heater. A temperature of the optical element is controlled by a temperature control device. The detector detects a current flowing in the heater and/or a voltage applied to the heater. The controller controls an electrical power provided to the heater so as to be kept constant according to the detection result of the detector.
    Type: Grant
    Filed: July 17, 2008
    Date of Patent: October 12, 2010
    Assignee: Eudyna Devices Inc.
    Inventors: Tsutomu Ishikawa, Toyotoshi Machida, Hirokazu Tanaka
  • Patent number: 7795859
    Abstract: Low cost millimeter wave imagers using two-dimensional focal plane arrays based on backward tunneling diode (BTD) detectors. Two-dimensional focal arrays of BTD detectors are used as focal plane arrays in imagers. High responsivity of BTD detectors near zero bias results in low noise detectors that alleviate the need for expensive and heat generating low noise amplifiers or Dicke switches in the imager. BTD detectors are installed on a printed circuit board using flip chip packaging technology and horn antennas direct the waves toward the flip chip including the BTD detectors. The assembly of the horn antennas, flip chips, printed circuit board substrate, and interconnects together work as an imaging sensor. Corrugated surfaces of the components prevent re-radiation of the incident waves.
    Type: Grant
    Filed: July 15, 2009
    Date of Patent: September 14, 2010
    Assignee: HRL Laboratories, LLC
    Inventors: Jonathan James Lynch, James H. Schaffner, Daniel Frederic Sievenpiper, Debabani Choudhury, Joseph Colburn, Joel N. Schulman, Harris P. Moyer, Andrew T. Hunter
  • Patent number: 7782066
    Abstract: A sensor for sensing a measurand is described, the sensor comprising a coplanar waveguide with a first surface and a second surface opposite to the first surface; a first structure with a first periodically varying dielectric characteristic, the first structure being arranged on the first surface of the coplanar waveguide; and a second structure with a second periodically varying dielectric characteristic, the second structure being arranged on the second surface of the coplanar waveguide, wherein a unit-cell of the structures with periodically varying dielectric characteristics is dimensioned such that the sensor has a frequency dependent transfer behavior with at least one transfer minimum, and wherein the sensor is implemented such that the measurand influences the first periodically varying dielectric characteristic of the first structure or the second periodically varying dielectric characteristic of the second structure or a relation between such first structure and second structure.
    Type: Grant
    Filed: August 30, 2007
    Date of Patent: August 24, 2010
    Assignee: Qimonda AG
    Inventor: Mojtaba Joodaki
  • Patent number: 7750629
    Abstract: A field detection device such as a micro-strip portion of a transmission line may detect an electric field and a magnetic field induced by current steps injected into the chassis coupled to a ground plane. The shield portions of the transmission line may be coupled to a first and a second port of an I/O connector. A measurement system coupled to the connector may determine the electric field and the magnetic field detected by the micro-strip. The measurement system may determine the electric field and magnetic field based on computing the sum and difference of the signals provided by the first port and the second port.
    Type: Grant
    Filed: August 30, 2007
    Date of Patent: July 6, 2010
    Assignee: Intel Corporation
    Inventors: Timothy J. Maloney, Andy Martwick, Kai Wang
  • Patent number: 7746062
    Abstract: A radio frequency (RF) testing system (100) includes a RF signal source (10) generating RF signals, an antenna (50), a RF testing circuit (40) disposed on a printed circuit board (PCB) (41), a testing probe (20) for receiving the RF signal from the RF testing circuit, and a testing apparatus (30) for testing the RF signals from the testing probe. The RF testing circuit includes a first pad (42), a second pad (44), a transmission line (48), and at least one ground portion (49) parallel to the transmission line. A distance between a first region defined by the first pad and a second region defined by the second pad positioned between the first region and the antenna is equal to one-fourth of the wavelength. During testing, the testing probe is electrically connected to the first pad, and the second pad is electrically connected to ground of the PCB.
    Type: Grant
    Filed: August 3, 2008
    Date of Patent: June 29, 2010
    Assignees: Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd., Hon Hai Precision Industry Co., Ltd.
    Inventors: Cheng-Yu Wu, Tao Yan
  • Patent number: 7746053
    Abstract: For testing an RF device, such as an RF receiver/decoder chip that receives an RF signal via an antenna terminal and outputs a digital code at an output terminal, an inexpensive non-RF programmable tester is used. The programmable tester is a commercially available tester that need only generate and receive non-RF digital and analog signals. The RF signals needed for the testing of the RF device are totally supplied by RF generators on a single printed circuit board, external to the commercial tester housing. The board contains controllable RF generating circuitry whose possible output amplitudes and frequencies need be only those necessary for testing the particular DUT. The frequencies may be changed by switching in different crystal resonators mounted on the board.
    Type: Grant
    Filed: August 26, 2008
    Date of Patent: June 29, 2010
    Assignee: Micrel, Inc.
    Inventors: Carlos E. Ribeiro, Douglas Falco
  • Patent number: 7705582
    Abstract: A power sensor includes a substrate, an aperture within the substrate, a membrane formed over at least a portion of the substrate and extending over the aperture, and an electro-thermal transducer partially supported by the insulating membrane. The electro-thermal transducer includes an impedance matched, bifurcated load supported over the aperture by the insulating membrane, and a thermopile extending over the aperture and supported by the insulating membrane, the thermopile being adapted to generate a voltage in response to heat generated in the impedance matched, bifurcated load. A signal conductor is electrically connected with one end of the impedance matched, bifurcated load to guide electromagnetic signals to the load, and a conductive under-layer stratified from the signal conductor by an intermediary dielectric is connected with an opposite end of the impedance matched, bifurcated load to act as a ground plane.
    Type: Grant
    Filed: April 16, 2007
    Date of Patent: April 27, 2010
    Assignee: Anritsu Company
    Inventor: Karam Michael Noujeim
  • Patent number: 7652464
    Abstract: An RF power detector having a wide dynamic range may comprise a chopping amplifier and is configured to detect pulsed high frequency RF signals. The chopping amplifier controlled by a bias current regulator amplifies and chops an RF signal by periodically enabling and disabling the amplifier according to a system clock. The chopped high frequency RF signal feeds a Schottky diode biased to operate in the square law region for weak signals. The Schottky diode voltage is tapped and high pass filtered. The voltage drives a logarithmic and linear converter. The converter outputs are summed to produce an output voltage that is a repeatable and stable monotonically increasing function of the RF power.
    Type: Grant
    Filed: May 4, 2007
    Date of Patent: January 26, 2010
    Assignee: ViaSat, Inc.
    Inventors: David Lang, Noel Lopez
  • Publication number: 20090243589
    Abstract: According to one embodiment, a surface-plasmon (SP) beam generated by an SP source and directed via an SP waveguide is applied to a gate node of a field-effect transistor (FET). The FET also has a source node and a drain node. In a representative configuration, the gate, source, and drain nodes are electrically biased to pass an electrical current between the source and drain nodes in a manner that makes the electrical current responsive to the intensity of the SP beam.
    Type: Application
    Filed: March 25, 2008
    Publication date: October 1, 2009
    Applicant: LUCENT TECHNOLOGIES INC.
    Inventor: Girsh Blumberg