Patents Examined by Paul Gensler
  • Non-reciprocal circuit element
    Patent number: 5786736
    Abstract: A non-reciprocal circuit element which can be miniaturized while still providing a matching capacitance having a large value. A circulator, for example, has central electrodes and a multilayer substrate for forming a matching capacitance. The multilayer substrate is formed by stacking a plurality of dielectric sheets provided with central electrodes or matching capacitive electrodes with each other and integrally firing the same. The matching capacitance is formed by connecting multilayer capacitive parts which are formed by stacking a number of dielectric sheets which are each partially sandwiched by a pair of capacitive electrodes in parallel with each other. An upper surface of the multilayer substrate has a first aperture for receiving a ferrite member and a second aperture for receiving a permanent magnet in positions facing the central electrodes.
    Type: Grant
    Filed: September 13, 1996
    Date of Patent: July 28, 1998
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Hiroki Dejima, Takashi Hasegawa, Yutaka Ishiura, Yoshikazu Chigodou, Hiroshi Matsui, Keiji Ogawa
  • Circuit selection device
    Patent number: 5783975
    Abstract: A circuit selection device includes a first terminal, a plurality of transmission lines, a plurality of second terminals, a plurality of loads for impedance matching, and a plurality of switches. An RF signal is input/output to/from the first terminal. Each transmission line has one end connected to the first terminal. Each of the second terminals is arranged in correspondence with the other end of each of the transmission lines to selectively input/output an RF signal input/output to/from the first terminal. Each load is arranged in correspondence with the other end of each of the transmission lines. Each switch is switched/connected to one of the second terminal and the load which correspond to the other end of each of the transmission lines. When one of the switches is switched to the second terminal side, the remaining switches are switched to the load side.
    Type: Grant
    Filed: January 16, 1997
    Date of Patent: July 21, 1998
    Assignee: NEC Corporation
    Inventor: Taisuke Nakamura
  • Filter enhancement using input-to-output ground isolation and shielding
    Patent number: 5781078
    Abstract: A method and apparatus for filter enhancement in an electrical system (8) is provided. The electrical system (8) includes an input circuit (10) having a filter (14) and an output circuit (20) having a filter (24). An input conductive enclosure (12) and an output conductive enclosure (22) protect the electrical system (8) from field coupling between the input circuit (10) and the output circuit (20). A choke balun (26) is connected between the input circuit (10) and the output circuit (20) to also eliminate conductive coupling. The elimination of unwanted coupling enhances the performance of the electrical system (8) by achieving greater stopband attenuation.
    Type: Grant
    Filed: December 5, 1996
    Date of Patent: July 14, 1998
    Assignee: Glenayre Electronics, Inc.
    Inventor: Theron L. Jones
  • Magnetostatic wave device
    Patent number: 5781079
    Abstract: A compact, low-cost magnetostatic wave device which can serve as an S/N enhancer or a filter. The magnetostatic wave device includes a ferromagnetic base; at least one transducer having a portion arranged adjacent to one surface of the ferromagnetic base and another. portion arranged adjacent to the other surface of the ferromagnetic base; an input terminal with one side connected to one end of the transducer and the other side grounded; and an output terminal with one side connected to the other end of the transducer and the other side grounded. The ferromagnetic base is preferably disk-shaped.
    Type: Grant
    Filed: November 15, 1995
    Date of Patent: July 14, 1998
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Takekazu Okada, Satoru Shinmura, Fumio Kanaya
  • NRD guide circuit, radar module and radar apparatus
    Patent number: 5781086
    Abstract: Dielectric circuit components such as a dielectric strip, dielectric blocks and dielectric ring inserted between conductive plates are molded from a thermoplastic material. As the thermoplastic material, thermoplastic resin is used which has a dielectric constant not greater than 2.4. The dielectric circuit components may be injection-molded from an injection-moldable high polymer material which contains fluorine and has a melting point not greater than 300.degree. C.
    Type: Grant
    Filed: October 24, 1995
    Date of Patent: July 14, 1998
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Shigeki Kato, Hiroshi Uematsu, Ken-ichi Ogawa, Tatsuya Hattori
  • Lumped-constant resonator structure and method for adjusting it
    Patent number: 5781088
    Abstract: The invention relates to a lumped-constant resonator construction, and a method for adjusting a lumped-constant resonator construction. The lumped-constant resonator construction comprises at least one, preferably ceramic substrate (4), at least one capacitance means (5), and at least one inductance means (6). The capacitance means and the inductance means (6) are clearly locatable separately but operatively connected. The inductance means (6) comprises a conductive coating (11). In the lumped-constant resonator construction according to the invention, the inductance means (6) which comprises the conductive coating (11) and which is locatable separately from the capacitance means (5) is provided on a preferably bar-like ceramic body (7) mounted on the substrate (4).
    Type: Grant
    Filed: April 29, 1996
    Date of Patent: July 14, 1998
    Assignee: ADC Solitra Oy
    Inventors: Aimo Turunen, Heli Jantunen
  • Switch attenuator
    Patent number: 5777530
    Abstract: The switch attenuator of the invention includes: a first terminal connected to an antenna; a second terminal connected to a transmitter; and a third terminal connected to a receiver, thereby switching a first state and a second state.
    Type: Grant
    Filed: January 23, 1997
    Date of Patent: July 7, 1998
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Tadayoshi Nakatuka
  • Method and apparatus for coupling a differential signal to an unbalanced port
    Patent number: 5777527
    Abstract: A differential signal is coupled to an unbalanced port (116) from a balanced port (110) by receiving a first portion of a first phase of a differential signal at a first resonator (104) and receiving a second phase of the differential signal at a second resonator (108). The first portion of the first phase of the differential signal is coupled to a first matching element (112) and the second phase of the differential signal is coupled to a second matching element (118). The first portion of the first phase of the differential signal is coupled to a phasing element (122) through the first matching element (112) and a second portion of the first phase of the differential signal, which is a 180 degree out of representation of the second phase of the differential signal, is coupled to the phasing element (122) through the second matching element (118).
    Type: Grant
    Filed: October 31, 1996
    Date of Patent: July 7, 1998
    Assignee: Motorola, Inc.
    Inventor: Stuart B. Sanders
  • Coaxial cable with integrated ground discharge wire
    Patent number: 5777535
    Abstract: A coaxial cable comprising a coaxial portion, an integrally formed messenger wire and an integrally formed antenna ground discharge wire is disclosed. The two additional wires are encased in webs formed from the same material used to jacket the coaxial member.
    Type: Grant
    Filed: May 21, 1996
    Date of Patent: July 7, 1998
    Assignee: Triology Communications Inc.
    Inventors: Simon H. Farfoud, Robert W. Nunn
  • Method of manufacturing a microstrip transmission device
    Patent number: 5777526
    Abstract: A microstrip transmission line device wherein if there is a difference between absolute transmission delay times tpd of two signals to be transmitted over two strip conductors, for example, if a clock signal for tpd=83.3 or 76.9 ps/cm and a data signal for tpd=63.3 or 56.9 ps/cm are to be transmitted, a transmission delay time tpd per unit length of one strip conductor is adjusted by disposing a dielectric just under the one strip conductor, the dielectric having a predetermined relative dielectric constant (in this case, .epsilon.r=5.0 or 4.0) different from a relative dielectric constant (in this case, .epsilon.r=9.0 or 8.0) of a dielectric just under another strip conductor by an amount corresponding to a difference between absolute transmission delay times tpd of the one strip conductor and the other strip conductor. In this manner, the lengths of the two strip lines are made equal.
    Type: Grant
    Filed: April 2, 1997
    Date of Patent: July 7, 1998
    Assignee: Hitachi, Ltd.
    Inventor: Kazuhiro Kawasaki
  • Integrated circuit assembly for distributed broadcasting of high speed chip input signals
    Patent number: 5777529
    Abstract: An integrated circuit assembly and a method for distributed broadcasting of high speed chip input signals to a series of on-chip destination cells is provided, which eliminates the need for input buffers. A bufferless distributed broadcasting path is provided by matching the impedances off-chip conductive trace, i.e. a package trace, which together with interface circuitry forms a first transmission line, and on-chip conductive traces which form a second transmission line, to provide a constant impedance transmission line extending from a package trace to the far end of the on-chip trace. The method of bufferless distributed circuit (BDC) broadcasting is applicable to chip designs such as a crosspoint switch, parallel multiplier and distributed amplifier, and provides advantages of lower signal delay and power dissipation. In an experimental GaAs HBT 8.times.
    Type: Grant
    Filed: October 10, 1996
    Date of Patent: July 7, 1998
    Assignee: Northern Telecom Limited
    Inventor: Kerry S. Lowe
  • Microwave non-reciprocal circuit element
    Patent number: 5774024
    Abstract: A microwave non-reciprocal circuit element which is further miniaturized and of low losses without causing conductor losses in center electrodes following miniaturization. The microwave non-reciprocal circuit element according to the present invention comprises a plurality of center electrodes which are arranged to intersect with each other in a state electrically insulated from each other, and a microwave magnetic or dielectric body which is arranged on an intersecting portion of the plurality of center electrodes, and the respective center electrodes are formed by a plurality of conductors 55, 56 and 57 which are stacked through the microwave magnetic or dielectric body.
    Type: Grant
    Filed: September 25, 1996
    Date of Patent: June 30, 1998
    Assignee: Murata Manufacturing Co, Ltd.
    Inventors: Hiroshi Marusawa, Takehiro Konoike, Kunisaburo Tomono, Takashi Kawanami, Takashi Hasegawa
  • High frequency impedance transformer
    Patent number: 5774026
    Abstract: A coupling and matching device for high frequency or microwave signal transmission includes two line sections (9, 10) with parallel, weakly coupled portions (9', 10'), where the primary section (9) forms a short circuit and is connected to a relatively low output impedance device while the secondary section (10) is connected to a relatively high input impedance device. The coupling and matching device also includes a ground plane parallel to the secondary line section (10), and a member (12) for varying the difference between the secondary line section and the ground plane.
    Type: Grant
    Filed: January 7, 1997
    Date of Patent: June 30, 1998
    Assignee: Communaute Europeenne
    Inventors: Bernard Cunin, Paul Geist, Alphonse Martz, Joseph-Albert Miehe
  • Thin-film multilayered electrode and method of fabricating same
    Patent number: 5770988
    Abstract: A thin-film multilayered electrode of a high frequency electromagnetic field coupled type is disclosed. The thin-film multilayered electrode comprises thin-film conductors and dielectric thin films alternately stacked on a dielectric substrate so that a plurality of TEM mode transmission lines are multilayered. A film thickness of each of the dielectric thin films is set so that phase velocities of TEM waves which propagate through at least two of the plurality of TEM mode transmission lines are made substantially equal to each other, and a film thickness of each of the thin-film conductors is set so as to be smaller than a skin depth of a frequency which is used so that electromagnetic fields of at least two of the plurality of TEM mode transmission lines are coupled with each other.
    Type: Grant
    Filed: August 22, 1996
    Date of Patent: June 23, 1998
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Yoshihiko Goto, Masato Kobayashi, Yukio Yoshino, Yuzo Katayama
  • Self isolating high frequency saturable reactor
    Patent number: 5770982
    Abstract: The present invention discloses a saturable reactor and a method for decoupling the interwinding capacitance from the frequency limitations of the reactor so that the equivalent electrical circuit of the saturable reactor comprises a variable inductor. The saturable reactor comprises a plurality of physically symmetrical magnetic cores with closed loop magnetic paths and a novel method of wiring a control winding and a RF winding. The present invention additionally discloses a matching network and method for matching the impedances of a RF generator to a load. The matching network comprises a matching transformer and a saturable reactor.
    Type: Grant
    Filed: October 29, 1996
    Date of Patent: June 23, 1998
    Assignee: Sematech, Inc.
    Inventor: James A. Moore
  • Microwave window
    Patent number: 5770990
    Abstract: A microwave window includes a transparent disk made of glass or ceramic that lets microwaves through and an attachment device made of metal that is used to attach the transparent disk. This microwave window is characterized by the fact that the transparent disk of glass is sealed into the attachment device or the transparent disk of ceramic is sintered into the attachment device.
    Type: Grant
    Filed: November 15, 1996
    Date of Patent: June 23, 1998
    Assignee: Krohne Messtechnik GmbH & Co. KG
    Inventor: Wilhelm Lubbers
  • Balanced to unbalanced transmission line impedance transformer exhibiting low insertion loss
    Patent number: 5767754
    Abstract: A balanced to unbalanced transmission line transformer is disclosed performing impedance transformation with improved frequency response across a wide operational bandwidth. The transmission line transformer significantly improves low frequency output balance by adding an additional transformer winding. The additional winding improves the low frequency response to less than 0.2dB across a given design bandwidth.
    Type: Grant
    Filed: January 24, 1997
    Date of Patent: June 16, 1998
    Assignee: General Instrument Corporation
    Inventor: Rudy Menna
  • Radio frequency power combiner
    Patent number: 5767755
    Abstract: A radio frequency power combiner includes a plurality of transmission lines connecting a plurality of input terminals to an output terminal. An RF switch is positioned between each of the input terminals and a transmission line connecting the output terminal to the input terminal. The electrical length between each RF switch and the output terminal is preferably one half of a wavelength at a central frequency, which may be realized by two transmission lines of different impedances in each path, each a quarter wavelength long. When the switches are on, the signal power applied to all of the input terminals is combined at the output terminal. When any given switch is turned off, the RF power incident to the switch is reflected, and the transmission lines connected between that switch and the output terminal appear as an open circuit. The power combiner can also operate as a power divider.
    Type: Grant
    Filed: October 25, 1996
    Date of Patent: June 16, 1998
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hong-Kee Kim, Young Kim, Soon-Chul Jeong, Chul-Dong Kim
  • Active quadrature power splitter
    Patent number: 5767756
    Abstract: An active quadrature power splitter having low power consumption is small in size and is inexpensive, for obtaining two output signals of which the phase difference is 90 degrees. Since the active quadrature power splitter operates as a microwave amplifier for obtaining two amplified microwave outputs having an equal magnitude and a phase difference of 90 degrees by using a matching circuit of the amplifier, a power gain can be obtained. Also, since a single FET or HBT is used and two output signals are generated in an output impedance matching circuit, the circuit becomes simplified. Therefore, the circuit can be easily implemented in a monolithic microwave IC and the chip size can be reduced.
    Type: Grant
    Filed: November 12, 1996
    Date of Patent: June 16, 1998
    Assignee: Electronics and Telecommunications Research Institute
    Inventor: In-Duk Hwang
  • Multi-layered bi-directional coupler utilizing a segmented coupling structure
    Patent number: 5767753
    Abstract: A multi-layered coupling device (FIG. 9) for coupling radio frequency (RF) energy on a transmission line (302) to a coplanar coupler. The coupling device includes a first coupling structure that is coplanar with the transmission line (302) and parallel plate structure (304) positioned a predetermined distance in a plane parallel to the transmission line (302). The parallel plate structure (304) is not physically connected to any other structure through the use of vias or the like. The parallel plate structure (304) is used to increase the coupling coefficient and directivity of the coplanar structure by being divided into a plurality of segments with varying dimensions to better control coupling capacitances.
    Type: Grant
    Filed: May 23, 1996
    Date of Patent: June 16, 1998
    Assignee: Motorola, Inc.
    Inventor: Charles R. Ruelke