Patents Examined by Justin P. Bettendorf
  • Patent number: 6563394
    Abstract: A coaxial circulator having ferrite members to which a static magnetic field is applied at a junction of a Y-shaped strip conductor, the coaxial conductor including a dielectric substrate, an inner pattern of the Y-shaped strip conductor provided on a center of an upper surface of the dielectric substrate, and ground patterns provided on the upper surface and a lower surface of the dielectric substrate along a periphery of the conductive inner pattern and electrically connected to each other via a plurality of through-holes in the dielectric substrate, the substrate being sandwiched by an upper block and a lower block, the ferrite members being provided adjacent to both the upper side and a lower side of the substrate so as to ground the ground patterns to the upper and lower block surfaces.
    Type: Grant
    Filed: July 25, 2000
    Date of Patent: May 13, 2003
    Assignee: Fujitsu Limited
    Inventor: Kenichi Kudo
  • Patent number: 6559732
    Abstract: A nonreciprocal circuit device miniaturized entirely by reducing the height and the weight can prevent characteristic deterioration. In the nonreciprocal circuit device, a ferrite assembly is formed by winding a quadrangular ferrite plate with insulated copper wires mutually intersecting. The ferrite assembly is arranged perpendicularly to the mounting surface of a mounting substrate. On each side of the ferrite assembly, there is arranged a magnet applying a static magnetic field perpendicularly to main surface of the ferrite plate.
    Type: Grant
    Filed: June 14, 2001
    Date of Patent: May 6, 2003
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Toshihiro Makino, Seigo Hino, Hiroshi Asai, Takekazu Okada
  • Patent number: 6556098
    Abstract: The present invention provides a nonreciprocal circuit device which can be assembled by an automatic assembling machine, and in which the built-in components thereof can be disposed with a high positioning accuracy, and further provides a communication apparatus using this nonreciprocal circuit device. The nonreciprocal circuit device as an isolator includes a metallic lower case portion, a resin terminal case, a center electrode assembly, a metallic upper case portion, and a permanent magnet. Inside the terminal case, there are provided irregular-shaped guide portions for disposing nonreciprocal circuit components such as the center electrode assembly, at a predetermined position, and more specifically, a window portion, recesses for capacitors, and a bank portion for permanent magnet. These guide portions have tapered side wall surfaces each having a predetermined taper angle &thgr;.
    Type: Grant
    Filed: March 2, 2001
    Date of Patent: April 29, 2003
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Ryohei Inami
  • Patent number: 6552626
    Abstract: A high power PIN diode single pole double throw (SPDT) switch for use in radar systems transmitting at over 50 watts of power. These systems require a switch that will provide adequate isolation for the sensitive amplifier circuits in the receiver subsystem of the radar from the high power transmit pulses in the event there is a bias failure such that the PIN diodes are at zero bias. By utilizing one single pole single throw (SPST) switch assembly between the transmitter and the antenna and at least two SPST switch assemblies between the antenna and the receiver, this isolation is achieved.
    Type: Grant
    Filed: January 12, 2000
    Date of Patent: April 22, 2003
    Assignee: Raytheon Company
    Inventors: Thomas M. Sharpe, Donald A. Charlton, Richard W. Burns
  • Patent number: 6549087
    Abstract: Avariable equalizer is described. The variable equalizer provides for independent control of a number of breakpoints in the frequency response of the equalizer so as to allow the equalizer to be readily tuned to compensate for the tilt of coaxial cables over a wide range of characteristic attenuation. In one embodiment, the variable equalizer includes a two port bridge “T” network with variable top and bottom branches that are independently and selectively adjusted to create a desired frequency response. For example, in one embodiment, the top branches include a number of variable RC networks and the bottom branches include a number of variable LR networks. In some embodiments, PEN diodes provide the variable resistance in these LR and RC networks.
    Type: Grant
    Filed: January 12, 1999
    Date of Patent: April 15, 2003
    Assignee: ADC Telecommunications, Inc.
    Inventors: Peter Sung Tri Hoang, Earl A. Daughtry
  • Patent number: 6549105
    Abstract: A millimeter wave module includes a silicon substrate with first and second cavityes formed by anisotropic etching on the silicon substrate, and a glass substrate having a microstrip filter pattern and microbumps for connecting the glass substrate to the silicon substrate. A filter is provided using an air layer as a dielectric disposed in the first cavity. An MMIC is mounted by the flip chip method over the second air layer. A coplanar waveguide is on the silicon substrate for connecting the filter and MMIC. The filter having low loss is achieved because it has the microstrip structure using air as an insulating layer. Also change in characteristics of the MMIC during mounting is eliminated because the MMIC is protected by contacting air. Accordingly, the millimeter wave module has excellent characteristics and is made using a simple method.
    Type: Grant
    Filed: October 3, 2001
    Date of Patent: April 15, 2003
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kazuaki Takahashi, Ushio Sangawa
  • Patent number: 6549097
    Abstract: An elementary electrical resonator which includes a ribbon conductor forming a flat loop with at least one turn, the conductor having ends which form two parallel segments. The resonator further includes a conducting bridge which forms an arch straddling the two parallel segments of the ribbon conductor wherein opposing surfaces of the arch and the parallel segments form a capacitor. A part of the bridge is capable of being displaced with respect to the parallel segments under the action of a control signal so as to cause the capacitance of the capacitor and therefore the tuning frequency of the resonator to vary.
    Type: Grant
    Filed: October 11, 2001
    Date of Patent: April 15, 2003
    Assignee: Memscap
    Inventors: Bertand Guillon, Pierre Blondy
  • Patent number: 6549086
    Abstract: The present invention provides a communication apparatus incorporating a nonreciprocal circuit device capable of being connected to a balanced output circuit without interposing a balun, a hybrid, or the like therebetween. The nonreciprocal circuit device includes an assembly formed of three central conductors. On the upper surface of a disk-shaped microwave ferrite member, the central conductors are arranged intersecting each other at an angle of approximately 120 degrees in a mutually electrically insulated manner. The second and third central electrodes have connecting portions at first ends thereof and the second ends thereof are connected to a ground electrode. The first central electrode has connecting portions at both ends thereof. The connecting portions of the first central electrode serve as feeding ends. An input port provided by the ends of the first central electrode serves as a balanced input port. An output port connected to the second central electrode serves as an unbalanced output port.
    Type: Grant
    Filed: January 22, 2002
    Date of Patent: April 15, 2003
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Takashi Kawanami
  • Patent number: 6545569
    Abstract: Filters and methods for eliminating a DC component from an electronic signal provide for circuitry having a zero corresponding to a cut-off frequency, and circuitry for shifting the zero by an amount corresponding to the absolute value of that cut-off frequency. The filters and methods, which include integration and operation of gyrators, are particularly well-suited for incorporation in integrated circuits by virtue of reducing the physical size of the required capacitors. A further advantage is the reduction of time-dependent inertia. Applications of the filters and methods include, but are not limited to, radiotelephony.
    Type: Grant
    Filed: December 3, 1999
    Date of Patent: April 8, 2003
    Assignee: Koninklijke Philips Electronics N.V.
    Inventor: Nigel Greer
  • Patent number: 6545558
    Abstract: A resin member is arranged between a permanent magnet, and a resistance element and a matching capacitor or the like. The ports of center electrodes are electrically connected to the resistance element and the matching capacitor element on the top faces of the resistance element and the matching capacitor element. A convexity of which the height is substantially equal to the electrode thickness of the ports of the center electrodes is formed on the under face of the resin member.
    Type: Grant
    Filed: October 25, 2001
    Date of Patent: April 8, 2003
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Takashi Hasegawa
  • Patent number: 6542053
    Abstract: A multi-layered LC composite component achieves greatly increased attenuation in the proximity of a central frequency without increasing insertion loss. In the arrangement of the multi-layered LC composite component, an end of each of inductor patterns is connected to a connecting pattern to be short-circuited. These inductor patterns define inductors. Frequency-adjusting capacitor patterns are opposed to open-circuited ends of the inductor patterns to define capacitors. As a result, the capacitors and the inductors define LC resonators. The connecting pattern is opposed to shield patterns via insulating sheets to define a common capacitor.
    Type: Grant
    Filed: June 21, 2002
    Date of Patent: April 1, 2003
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Naoto Yamaguchi
  • Patent number: 6542047
    Abstract: A 90 degree splitter which covers a wide frequency range of 1500 to 2500 Mhz in a small footprint of only 0.2 inches by 0.2 inches. This device does not use any capacitors which greatly simplifies the construction and lowers the cost in comparison to conventional splitters.
    Type: Grant
    Filed: December 5, 2000
    Date of Patent: April 1, 2003
    Assignee: Mini-Circuits
    Inventors: Lu Chen, Radha Setty, Daxiong Ji
  • Patent number: 6538532
    Abstract: A series tuned resonator circuit topology permits implementation of narrow band-pass filters having higher loaded quality factors (QL) and lower insertion loss than was previously achievable in the prior art employing such a topology. The topology employs an additional parallel capacitor for the series-tuned topology, with very low C/L ratios to achieve the combination of higher values of QL, low insertion loss and a steeper roll-off between the pass-band and the stop-band (at both lower and higher frequencies). Air coils are used to achieve the large inductor values desirable for the series-tuned topology.
    Type: Grant
    Filed: April 10, 2001
    Date of Patent: March 25, 2003
    Assignee: Broadband Innovations, Inc.
    Inventor: Branislav Petrovic
  • Patent number: 6535074
    Abstract: A non-reciprocal circuit element for transmitting a signal in one way or cyclically transmitting the signal by using circuit means having at least a ferrite (34), transmission lines (31, 32, and 33), and a capacitor (21), has at least two external input/output terminals (11 and 12) for transferring a signal to and from an external unit and at least one of external grounding terminals (13, 14, and 15) for grounding, wherein at least one (13) of the external grounding terminals is set between at least one set of the external input/output terminals (11 and 12).
    Type: Grant
    Filed: January 4, 2002
    Date of Patent: March 18, 2003
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yasuhiko Horio, Takayuki Takeuchi, Masumi Hattori, Hiroyuki Hase
  • Patent number: 6531930
    Abstract: A non-reciprocal circuit element for transmitting a signal in one way or cyclically transmitting the signal by using circuit means having at least a ferrite (34), transmission lines (31, 32, and 33), and a capacitor (21), has: at least two external input/output terminals (11 and 12) for transferring a signal to and from an external unit and at least one of external grounding terminals (13, 14, and 15) for grounding, wherein at least one (13) of the external grounding terminals is set between at least one set of the external input/output terminals (11 and 12).
    Type: Grant
    Filed: January 4, 2002
    Date of Patent: March 11, 2003
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yasuhiko Horio, Takayuki Takeuchi, Masumi Hattori, Hiroyuki Hase
  • Patent number: 6529087
    Abstract: In a noise removing filter for removing the electromagnetic wave noise leaking from an electronic equipment to the outside via a connector throughhole through which a connector passes, the noise removing filter includes a magnetic member filled in a gap between a body of the electronic equipment and the connector to cover the circumference of the connector.
    Type: Grant
    Filed: December 22, 2000
    Date of Patent: March 4, 2003
    Assignee: NEC Corporation
    Inventor: Kunio Kawato
  • Patent number: 6529103
    Abstract: An improved internally grounded feedthrough filter capacitor includes at least one conductive terminal pin, a feedthrough filter capacitor having first and second sets of electrode plates and a first passageway through which the terminal pin extends in conductive relation with the first set of electrode plates, and a conductive ferrule through which the terminal pin passes in non-conductive relation. A conductive ground plane includes a plate which substantially spans and supports an adjacent face of the feedthrough filter capacitor, and an integral grounded terminal pin which extends into a second passageway through the feedthrough filter capacitor in conductive relation with the second set of electrode plates. A washer electrically insulates the feedthrough filter capacitor from the conductive ferrule except for the conductive relation between the grounded terminal pin and the second set of electrode plates.
    Type: Grant
    Filed: September 7, 2000
    Date of Patent: March 4, 2003
    Assignee: Greatbatch-Sierra, Inc.
    Inventors: Richard L. Brendel, Robert A. Stevenson
  • Patent number: 6529088
    Abstract: A tunable resonant system includes an electric element, and a core having a controllable parameter that determines the resonant frequency of the system. In order to tune the resonant system to a desired frequency, a low power, narrowband signal is applied at a selected frequency to the electric element. The reflected or transmitted power is measured and the value of the controllable parameter adjusted to vary the resonant frequency of the system in a closed loop until the reflected power is at a minimum.
    Type: Grant
    Filed: December 26, 2000
    Date of Patent: March 4, 2003
    Assignee: Vistar Telecommunications Inc.
    Inventors: Philippe Lafleur, David Roscoe
  • Patent number: 6525628
    Abstract: Both discrete and array RC components are described using cofireable resistive material as part of internal electrodes of the device. The devices include a sintered body of multilayer ceramic material in which multiple first and second electrode layers are stacked. Each of the first layers comprises at least one resistive electrode pattern extending across the sintered body between respective pairs of terminations. The second layers comprise an electrode pattern extending transverse to the resistive electrode pattern, such as between end terminations. In some embodiments, opposing side electrodes serve as input and output terminals of a respective feedthrough filter. In a feedthrough arrangement, the third terminal may be provided by one or both of the end terminals. The invention also describes an improved termination structure including a layer made from a metal oxide material.
    Type: Grant
    Filed: June 18, 1999
    Date of Patent: February 25, 2003
    Assignee: AVX Corporation
    Inventors: Andrew P. Ritter, Andrew Blair, Maureen Strawhorne, Clare Ashley Moore, Robert H. Heistand, II
  • Patent number: 6522223
    Abstract: A zero-IF-converter, particularly for digital satellite receivers, comprising a thin-film component including at least two RC filters each including a resistor and a capacitor which each comprise a lower electrode, an upper electrode and a dielectric material, said RC filters being arranged on a common substrate, is characterized by a constant amplitude and phase relationship between the base band signals I and Q.
    Type: Grant
    Filed: January 12, 2000
    Date of Patent: February 18, 2003
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Hans Peter Löbl, Paul H. M. Van Oppen, Theodoor G. S. M. Rijks, Mareike K. Klee, Gerardus J. N. Doodeman