Including Spurious Signal Prevention Or Reduction Means Patents (Class 333/194)
  • Patent number: 9806693
    Abstract: A duplexer includes a transmission filter with a ladder circuit configuration and a reception filter including a ladder filter portion connected to an antenna terminal and a longitudinally coupled resonator-type surface acoustic wave filter. In the transmission filter, a coupling capacitor is connected between an end portion of an inductor nearer to parallel arm resonators and a wiring line connecting the series arm resonators of the ladder filter portion to each other in the reception filter.
    Type: Grant
    Filed: February 24, 2016
    Date of Patent: October 31, 2017
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Yuichi Takamine
  • Patent number: 9762209
    Abstract: A duplexer includes a transmission filter with a ladder circuit configuration and a reception filter. The reception filter includes a series trap element connected to an antenna terminal and a longitudinally coupled resonator-type surface acoustic wave filter. In the transmission filter, a coupling capacitance is connected between an end portion at parallel arm resonators side of an inductance and a line connecting the series trap element to the longitudinally coupled resonator-type surface acoustic wave filter in the reception filter.
    Type: Grant
    Filed: February 24, 2016
    Date of Patent: September 12, 2017
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Yuichi Takamine
  • Patent number: 9379308
    Abstract: A piezoelectric component comprises a parallelepipedal basic body made of piezoelectric material which has an input region and an output region at opposite longitudinal ends of the basic body. Furthermore, the piezoelectric component comprises first and second primary electrodes which are arranged inside the input region and first and second secondary electrodes which are arranged inside the output region. The primary electrodes are at a greater interval from longitudinal lateral faces of the basic body in a subregion which faces the output region than in the subregion which is remote from the output region. Likewise, the secondary electrodes are at a greater interval from the longitudinal lateral faces of the basic body in a subregion which faces the input region than in a subregion which is remote from the input region.
    Type: Grant
    Filed: November 15, 2011
    Date of Patent: June 28, 2016
    Assignee: EPCOS AG
    Inventors: Igor Kartashev, Peter Kraxner, Markus Puff
  • Patent number: 9362884
    Abstract: The invention relates to a micro-acoustic filter having a first and a second converter, in which the electromagnetic and capacitive cross-talk between the first and second converters is compensated for by providing additional coupling capacitors and additional current loops. Additional coupling capacitors and current loops are arranged in such a manner that they can counteract the sign of the natural coupling specified by the design and thus completely compensate for said coupling.
    Type: Grant
    Filed: February 14, 2011
    Date of Patent: June 7, 2016
    Assignee: EPCOS AG
    Inventors: Guillermo Moreno Granado, Jürgen Kiwitt, Maximilian Pitschi, Tilo Gärtner
  • Patent number: 9331669
    Abstract: Filter devices and duplexer devices are disclosed. A filter device includes two or more surface acoustic wave resonators, including at least a first shunt resonator, formed on a surface of a substrate. A ground conductor formed on the surface of the substrate connects the first shunt resonator to a ground pad. At least a portion of an edge of the ground conductor is shaped as a plurality of serrations.
    Type: Grant
    Filed: June 3, 2015
    Date of Patent: May 3, 2016
    Assignee: Resonant Inc.
    Inventors: James R. Costa, Kurt Raihn
  • Patent number: 9258138
    Abstract: An integrated circuit chip can include an interference mitigator. The interference mitigator can be to modify encoding to generate a cancellation pattern for optimum cancellation of radio frequency interference (RFI) at the effective mid-point of the data bus. The interference mitigator can also be to transmit the generated cancellation pattern across the data bus to cancel the radio frequency interference.
    Type: Grant
    Filed: December 23, 2013
    Date of Patent: February 9, 2016
    Assignee: Intel Corporation
    Inventor: William Dawson Kesling
  • Patent number: 9231556
    Abstract: An acoustic wave filter having reduced non-linearities as well as a production method are disclosed. A filter comprises a first electroacoustic transducer having a first metallization ratio and a second electroacoustic transducer having a second metallization ratio. The metallization ratios range from 0.2 to 0.8, and the metallization ratio of the first transducer is no more than 0.8 times the metallization ratio of the second transducer.
    Type: Grant
    Filed: August 25, 2011
    Date of Patent: January 5, 2016
    Assignee: EPCOS AG
    Inventor: Edgar Schmidhammer
  • Patent number: 9088263
    Abstract: A surface acoustic wave (SAW) resonator and a SAW oscillator and an electronic apparatus including the resonator are to be provided. A SAW resonator includes: an IDT exciting a SAW using a quartz crystal substrate of Euler angles (?1.5°???1.5°, 117°???142°, 42.79°?|?|?49.57°); one pair of reflection units arranged so as allow the IDT to be disposed therebetween; and grooves acquired by depressing the quartz crystal substrate located between electrode fingers. When a wavelength of the SAW is ?, and a depth of the grooves is G, “0.01??G” is satisfied.
    Type: Grant
    Filed: June 16, 2011
    Date of Patent: July 21, 2015
    Assignee: Seiko Epson Corporation
    Inventor: Kunihito Yamanaka
  • Patent number: 9077312
    Abstract: A filter includes two or more surface acoustic wave resonators formed on a surface of a substrate and at least one ground conductor formed on the surface of the substrate. At least a portion of an edge of the ground conductor is formed as a plurality of serrations.
    Type: Grant
    Filed: September 24, 2014
    Date of Patent: July 7, 2015
    Assignee: Resonant Inc.
    Inventors: James R. Costa, Kurt Raihn
  • Patent number: 9076956
    Abstract: A surface acoustic wave (SAW) array sensor having an input interdigital transducer (IDT); first and second output IDTs that are disposed at both sides of the input IDT, respectively; a first delay line between the input IDT and the first output IDT; and a second delay line between the input IDT and the second output IDT, wherein the first and second delay lines have different lengths; and related devices.
    Type: Grant
    Filed: January 16, 2013
    Date of Patent: July 7, 2015
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Yeol-ho Lee, Youn-suk Choi, Tae-han Lee, Soo-suk Lee
  • Patent number: 8896399
    Abstract: An acoustic wave device includes: a substrate; a dielectric film formed on the substrate; opposing comb-shaped electrodes located between the substrate and the dielectric film, each of the opposing comb-shaped electrodes including an electrode finger, wherein at least one of the substrate and the dielectric film is a piezoelectric substance, an upper surface of the dielectric film, which is located above a gap between a tip of an electrode finger of one of the opposing comb-shaped electrodes and the other of the opposing comb-shaped electrodes, is inclined against an upper surface of the substrate in an extension direction of the electrode finger, and an inclination angle of the upper surface of the dielectric film against the upper surface of the substrate is equal to or larger than 30° and equal to or smaller than 50°.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: November 25, 2014
    Assignee: Taiyo Yuden Co., Ltd.
    Inventors: Michio Miura, Satoru Matsuda, Takashi Yamashita, Hiraki Domon
  • Publication number: 20140292444
    Abstract: An elastic wave filter includes an electrode finger group in an input side electrode and an electrode finger group in output side electrode each disposed in a taper shape such that elastic waves with mutually different wavelengths propagate on a piezoelectric substrate across from a track Tr1 at a low frequency side of a passband to a track Tr2 at a high frequency side of the passband. Assuming that a period length P is a wavelength of the elastic wave propagating on the piezoelectric substrate and constituted of a width dimension of the finger and a separation dimension between the adjacent electrode fingers, at least one of the input side IDT electrode and the output side IDT electrode includes a specific configuration.
    Type: Application
    Filed: March 27, 2014
    Publication date: October 2, 2014
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventors: OSAMU TOKUDA, TADAAKI TSUDA
  • Patent number: 8756796
    Abstract: A method for producing an electric component including a dielectric layer on a substrate, includes the method steps of applying a metallic layer to the substrate and oxidizing the metallic layer to form a dielectric layer, wherein at least one partial region of the metallic layer is fully oxidized through the entire thickness of the layer.
    Type: Grant
    Filed: August 23, 2010
    Date of Patent: June 24, 2014
    Assignee: Epcos AG
    Inventors: Werner Ruile, Markus Hauser, Christoph Eggs, Hans-Peter Kirschner
  • Patent number: 8723392
    Abstract: Disclosed herein is a surface acoustic wave (SAW) filter and method of making the same. The SAW filter includes a piezoelectric substrate; a planar barrier layer disposed above the piezoelectric substrate, and at least one conductor buried in the piezoelectric substrate and the planar barrier layer.
    Type: Grant
    Filed: July 15, 2011
    Date of Patent: May 13, 2014
    Assignee: International Business Machines Corporation
    Inventors: James W. Adkisson, Panglijen Candra, Thomas J. Dunbar, Jeffrey P. Gambino, Mark D. Jaffe, Anthony K. Stamper, Randy L. Wolf
  • Patent number: 8723393
    Abstract: A SAW device 11 has an IDT which is provided on the principal surface of a quartz crystal substrate 12 having Euler angles (?1.5°???1.5°, 117°???142°, 42.79°?|?|?49.57°) and excites a SAW in a stopband upper end mode, and a pair of reflectors which are arranged on both sides of the IDT. Inter-electrode-finger grooves are recessed between the electrode fingers of the IDT, and inter-conductor-strip grooves are recessed between the conductor strips of the reflectors. The wavelength ? of the SAW and the depth G of the inter-electrode-finger grooves satisfy 0.01??G. An IDT line occupancy ? and the depth G of the inter-electrode-finger grooves satisfy a predetermined relational expression. The IDT line occupancy ? and a reflector line occupancy ?r satisfy the relationship ?<?r. Therefore, an excellent frequency-temperature characteristic and a high Q value in an operation temperature range are realized simultaneously.
    Type: Grant
    Filed: September 1, 2011
    Date of Patent: May 13, 2014
    Assignee: Seiko Epson Corporation
    Inventor: Kunihito Yamanaka
  • Patent number: 8692439
    Abstract: A surface acoustic wave resonator has a quartz crystal substrate having Euler angles of (?=0°, 110°???150°, 88°???92°) and an IDT having a plurality of electrode fingers disposed on the quartz crystal substrate, and using a surface acoustic wave as an excitation wave, a plurality of grooves arranged in a propagation direction of the surface acoustic wave to form stripes is disposed on the quartz crystal substrate, and the electrode fingers are disposed one of between the grooves and inside the grooves.
    Type: Grant
    Filed: August 18, 2011
    Date of Patent: April 8, 2014
    Assignee: Seiko Epson Corporation
    Inventors: Takuya Owaki, Kunihito Yamanaka
  • Patent number: 8680743
    Abstract: A SAW device 11 has an IDT which is provided on the principal surface of a quartz crystal substrate 12 having Euler angles (?1.5°???1.5°, 117°???142°, 42.79°?|?|?49.57°) and excites a SAW in a stopband upper end mode, and a pair of reflectors which are arranged on both sides of the IDT. Inter-electrode-finger grooves are recessed between the electrode fingers of the IDT, and inter-conductor-strip grooves are recessed between the conductor strips of the reflectors. The wavelength ? of the SAW and the depth G of the inter-electrode-finger grooves satisfy 0.01??G. An IDT line occupancy ? and the depth G of the inter-electrode-finger grooves satisfy a predetermined relational expression. The IDT line occupancy ? and a reflector line occupancy ?r satisfy the relationship ?<?r. Therefore, an excellent frequency-temperature characteristic and a high Q value in an operation temperature range are realized simultaneously.
    Type: Grant
    Filed: September 1, 2011
    Date of Patent: March 25, 2014
    Assignee: Seiko Epson Corporation
    Inventor: Kunihito Yamanaka
  • Patent number: 8670950
    Abstract: The invention relates to false echo storage in the area of level measurement. The decision as to whether or not to initialize and/or update the false echo memory is made using at least one value for the sensor-inherent noise, container noise and/or EMC noise for this purpose. This may make it possible to avoid identifying a false echo as the level echo.
    Type: Grant
    Filed: November 4, 2010
    Date of Patent: March 11, 2014
    Assignee: VEGA Grieshaber KG
    Inventors: Karl Griessbaum, Roland Welle
  • Patent number: 8336192
    Abstract: A method of collective fabrication of remotely interrogatable sensors, wherein the method may include fabricating fabricating a first series of first resonators exhibiting a first resonant frequency at ambient temperature and a first static capacitance and fabricating a second series of second resonators exhibiting a second resonant frequency at ambient temperature and a second static capacitance. The method may also include performing a series of electrical measurements of the set of the first series of first resonators and of the set of the second series of second resonators, so as to determine first pairs and second pairs of resonant frequency and of capacitance of each of the first and second resonators and performing a series of matching of a first resonator and of a second resonator.
    Type: Grant
    Filed: June 21, 2010
    Date of Patent: December 25, 2012
    Assignee: Senseor
    Inventors: Jean-François Leguen, Luc Chommeloux
  • Patent number: 8327522
    Abstract: The invention relates to a process for the collective fabrication of a remotely interrogable sensor having at least one first resonator and one second resonator. Each resonator exhibits respectively a first and a second operating frequency. A first series of first resonators are fabricated. The first resonators each have a first operating frequency belonging to a first set of frequencies centered on a first central frequency. A second series of second resonators are fabricated. The second resonators each having a second operating frequency belonging to a second set of frequencies centered on a second central frequency. A series of pairings of a first resonator and of a second resonator are conducted so as to form pairs of resonators exhibiting a difference of operating frequencies which is equal to the difference of the first and second central frequencies.
    Type: Grant
    Filed: October 17, 2007
    Date of Patent: December 11, 2012
    Assignee: Senseor
    Inventors: Luc Chommeloux, Raphael Lardat, Sylvain Ballandras
  • Publication number: 20120235769
    Abstract: There is provided a tapered elastic wave filter higher in impedance than a conventional filter where one input-side IDT electrode and one output-side IDT electrode are disposed. Filter parts which are the same in the structure of an input-side IDT electrode and in the structure of an output-side IDT electrode are disposed, and when the first filter part is disposed on a lower side and the second filter part is disposed on an upper side of the first filter part so that the input-side IDT electrodes are connected and the output-side IDT electrodes are connected, in cascade (in series) between a signal port and a ground port, an upper busbar in each of the IDT electrodes of the first filter part and a lower busbar in each of the IDT electrodes of the second filter part are electrically connected to each other.
    Type: Application
    Filed: March 8, 2012
    Publication date: September 20, 2012
    Applicant: NIHON DEMPA KOGYO CO., LTD.
    Inventor: Tadaaki TSUDA
  • Patent number: 8269577
    Abstract: In an acoustic wave filter, a notch resonator is connected in series or parallel with a plurality of acoustic wave resonators connected in a ladder shape. The notch resonator has a main resonant frequency that is substantially equal to a sub-resonant frequency of the acoustic wave resonators. With this configuration, the occurrence of sub-resonant responses in filter characteristics can be suppressed, resulting in an improvement in communication characteristics.
    Type: Grant
    Filed: October 9, 2009
    Date of Patent: September 18, 2012
    Assignee: Taiyo Yuden Co., Ltd.
    Inventors: Shogo Inoue, Michio Miura, Takashi Matsuda
  • Patent number: 8222721
    Abstract: An integrated circuit (500) includes a semiconductor substrate (400) and an integrated circuit package (530). The semiconductor substrate (400) has a first pair of bonding pads (442, 444) conducting a differential output signal thereon and adapted to be coupled to an input of a first external filter, and a second pair of bonding pads (452, 454) conducting a differential input signal thereon and adapted to be coupled to an output of said first external filter. The integrated circuit package (530) encapsulates the semiconductor substrate (400) and has first (452, 454) and second (552, 554) terminal pairs corresponding and coupled to the first (442, 444) and second (452, 454) pairs of bonding pads, respectively. The first (452, 454) and second (552, 554) terminal pairs are separated by a first predetermined distance is sufficient to maintain an input-to-output isolation therebetween of at least a first predetermined amount.
    Type: Grant
    Filed: October 21, 2003
    Date of Patent: July 17, 2012
    Assignee: Silicon Laboratories Inc.
    Inventors: Andrew W. Dornbusch, Charles D. Thompson
  • Patent number: 8169279
    Abstract: A notched SAW image frequency rejection filter system includes a SAW filter having an input, an output and a ground output and an impedance matching network including a first matching inductance connected to the SAW filter output and a second matching inductance connected to the ground output of the SAW filter; the SAW filter having an inherent internal capacitance that produces a predetermined capacitive leakage current at the image frequency; an inherent internal inductance that produces an inductance leakage current at the image frequency; and a boosted inherent parasitic ground inductance at the ground output of the SAW filter for generating a voltage across the second matching inductance to produce a compensation current which is substantially opposite in phase and substantially matched in magnitude with the capacitive leakage current for reducing the capacitive leakage current and increasing the image frequency rejection.
    Type: Grant
    Filed: October 23, 2009
    Date of Patent: May 1, 2012
    Assignee: Lojack Operating Company, LP
    Inventor: Orest Fedan
  • Patent number: 8138856
    Abstract: An acoustic wave device comprising a piezoelectric layer on an omnidirectional acoustic mirror and excitation and/or reception means on a surface of said piezoelectric layer, capable of exciting waves in a band gap of the acoustic mirror.
    Type: Grant
    Filed: January 28, 2011
    Date of Patent: March 20, 2012
    Assignees: Centre National de la Recherche Scientifique, Universite de Franche Comte
    Inventors: Abdelkrim Khelif, Abdelkrim Choujaa, Vincent Laude
  • Patent number: 8106726
    Abstract: A surface acoustic wave device includes a pair of reflectors and an interdigital transducer having a cross electrode having a interdigitated portion and a dummy portion and a dummy electrode. The dummy electrode has a length different from the length of the dummy portion of the cross electrode arranged adjacent to the dummy electrode.
    Type: Grant
    Filed: January 17, 2006
    Date of Patent: January 31, 2012
    Assignee: National University Corporation Chiba University
    Inventors: Kenya Hashimoto, Masatsune Yamaguchi, Tatsuya Omori, Naofumi Yokoyama, Kenji Matsuda
  • Patent number: 8106725
    Abstract: An acoustic wave filter device includes longitudinally coupled resonator-acoustic wave filters having a balanced-unbalanced conversion function, and increases the amount of attenuation in an attenuation band and improves the isolation characteristics when the acoustic wave filter device is used as a reception filter of a duplexer. The acoustic wave filter device includes an unbalanced terminal, first and second balanced terminals, first and second longitudinally coupled resonator-acoustic wave filters that are connected between the unbalanced terminal and the first balanced terminal and between the unbalanced terminal and the second balanced terminal, respectively, a first parallel resonator connected between the first balanced terminal and a ground potential, and a second parallel resonator connected between the second balanced terminal and the ground potential. The electrostatic capacitance of the first parallel resonator is different from the electrostatic capacitance of the second parallel resonator.
    Type: Grant
    Filed: April 14, 2011
    Date of Patent: January 31, 2012
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Yuichi Takamine
  • Patent number: 8035464
    Abstract: Improved coupling coefficients and desirable filter characteristics are exhibited in a SAW filter including an electrode pattern deposited on a piezoelectric substrate bonded directly to an anti-reflective layer, wherein the anti-reflective layer is bonded to a carrier through an adhesive layer such that a preselected thickness of the anti-reflective layer is sufficient for enhancing an acoustic match between the piezoelectric substrate and the adhesive layer.
    Type: Grant
    Filed: March 5, 2009
    Date of Patent: October 11, 2011
    Assignee: Triquint Semiconductor, Inc.
    Inventors: Benjamin P. Abbott, Robert Aigner, Julien Gratier, Taeho Kook
  • Patent number: 8009722
    Abstract: In a parametric G-Rake receiver, a method an apparatus computes initial estimates of one or more scaling parameters and initial combining weights for the parametric G-Rake receiver; estimates the SINR of a received signal based on a mean pilot symbol estimate and the initial combining weights; computes revised estimates for one or more scaling parameters based on the estimated SINR and the initial combining weights; and computes revised combining weights based on one or more revised scaling parameter estimates.
    Type: Grant
    Filed: December 12, 2007
    Date of Patent: August 30, 2011
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Tracy L. Fulghum
  • Publication number: 20110133858
    Abstract: An elastic wave device includes a piezoelectric substrate, an IDT electrode disposed on a piezoelectric device, a first dielectric layer disposed on the piezoelectric substrate such that it covers the IDT electrode, and a second dielectric layer disposed over the first dielectric layer. The second dielectric layer propagates transverse waves faster than that on the first dielectric layer. When a film thickness of the second dielectric layer is greater than a wave length of a major wave excited by the IDT electrode, a cut angle of the piezoelectric substrate in indication of Euler angles (?, ?, ?) is set to ??0°, ??0°, and ??0°. This suppresses deterioration of device characteristics.
    Type: Application
    Filed: August 5, 2009
    Publication date: June 9, 2011
    Inventors: Rei Goto, Hidekazu Nakanishi, Hiroyuki Nakamura
  • Patent number: 7889025
    Abstract: An anti-reflective acoustic diffusion device is provided by a group of irregularly dimensioned diffusing elements positioned on an acoustic wave substrate end that diffuse the SAW and eliminate unwanted acoustic reflections from the end of the substrate. The irregularly dimensioned diffusing elements are substantially irregular in size, shape, composition, and location and provide the desired diffusion into a nearly uniform distributed acoustic energy with a random phase. The anti-reflective acoustic diffusion device can be used with SAW, BAW or multiple acoustic wave configurations. This invention also encompasses an anti-reflective acoustic diffusion system and methods for diffusing acoustic reflections with anti-reflective acoustic diffusing elements.
    Type: Grant
    Filed: June 10, 2008
    Date of Patent: February 15, 2011
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: John A. Kosinski, Robert A. Pastore, Jr.
  • Patent number: 7880563
    Abstract: An acoustic wave device comprising a piezoelectric layer on an omnidirectional acoustic mirror and excitation and/or reception means on a surface of said piezoelectric layer, capable of exciting waves in a band gap of the acoustic mirror.
    Type: Grant
    Filed: February 16, 2006
    Date of Patent: February 1, 2011
    Assignees: Centre National de la Recherche Scientifique, Universite de Franche Comte
    Inventors: Abdelkrim Khelif, Abdelkrim Choujaa, Vincent Laude
  • Patent number: 7868717
    Abstract: A transducer includes an acoustic track in which an acoustic wave can be propagated, the acoustic track having a transversal fundamental mode, the acoustic track being subdivided in a transversal direction into an excitation area and two peripheral areas. The transducer also includes a first outside area and a second outside area bordering the acoustic track such that the acoustic track is arranged in the transversal direction between the first and second outside area. The transducer also includes peripheral areas configured such that the longitudinal phase velocity vRB of the acoustic wave in the respective peripheral area is greater than the longitudinal phase velocity vMB of the wave in the excitation area.
    Type: Grant
    Filed: December 18, 2006
    Date of Patent: January 11, 2011
    Assignee: EPCOS AG
    Inventors: Markus Mayer, Karl Christian Wagner, Andreas Bergmann
  • Patent number: 7825750
    Abstract: Disclosed relates to an electromagnetic interference (EMI) filter. Capacitance and resistance or inductance of an EMI filter, which includes a resistor and a capacitor or an inductor and a capacitor, can be controlled, such that a cutoff frequency can be freely controlled without manufacturing a separate EMI filter according to a characteristic of a desired cutoff frequency. Further, an intelligent EMI filter that can be applied to a surge protection device, which includes an ESD protection function as well as the EMI filter, is provided, such that a process can be simplified and costs can be reduced.
    Type: Grant
    Filed: June 27, 2007
    Date of Patent: November 2, 2010
    Assignee: Petari Incorporation
    Inventors: Kye Nam Lee, Young Jin Park, Jin Hyung Kim, Hyun Kyu Yang, Yoo Ran Kim
  • Patent number: 7797823
    Abstract: Apparatus and method for providing high density component assemblies, such as electromechanical or electro-optical assemblies.
    Type: Grant
    Filed: December 31, 2007
    Date of Patent: September 21, 2010
    Assignee: Alcatel Lucent
    Inventors: Fabien Létourneau, Stefano DeCecco, Peter Serjak
  • Patent number: 7795788
    Abstract: An IDT electrode (3) on a piezoelectric substrate (2) has an electrode including first metal layers (31a, 31b) formed of titanium or a titanium alloy, or chromium or a chromium alloy and second metal layers (32a, 32b) formed of aluminum or an aluminum alloy, copper or a copper alloy, or gold or a gold alloy, which are laminated alternately. The orientation degrees in the first metal layer (31a) that is closest to the surface of the piezoelectric substrate (2) in the first metal layers (31a, 31b) and the second metal layer (32a) that is closest to the surface of the piezoelectric substrate (2) in the second metal layers (32a, 32b) are higher than the orientation degrees in the upper metal layers. As compared with the prior art where the orientation degrees in the first metal layers (31a, 31b) and the second metal layers (32a, 32b) are not considered, the power handling capability of the IDT electrode (3) can be significantly improved.
    Type: Grant
    Filed: October 25, 2005
    Date of Patent: September 14, 2010
    Assignee: Kyocera Corporation
    Inventors: Yuuko Yokota, Shigehiko Nagamine, Kiyo Yamahara
  • Patent number: 7733196
    Abstract: An antenna duplexer includes a piezoelectric substrate having a surface, a grounding terminal to be grounded, first and second surface acoustic wave (SAW) filters mounted on the piezoelectric substrate, first and second terminals connected to the first and second SAW filters, respectively, and a line mounted on the surface of the piezoelectric substrate between the first SAW filter and the second SAW filter. A stray coupling path is produced between the first and second terminals. A first end of the line is connected to the grounding terminal. A second end of the line opens and is coupled capacitively to the stray coupling path. The antenna duplexer has a large isolation characteristic between the surface acoustic wave filters.
    Type: Grant
    Filed: April 20, 2006
    Date of Patent: June 8, 2010
    Assignee: Panasonic Corporation
    Inventors: Tetsuya Tsurunari, Katsuya Fujii
  • Patent number: 7729450
    Abstract: A proposed spread spectrum signal receiver includes a radio front-end unit and a processing unit. The radio front-end unit, in turn, has an antenna, a digitizing circuit and a primary buffer unit. The antenna is adapted to receive radio signals (SHF) from a plurality of signal sources, and the digitizing circuit is adapted to downconvert and filter the received signals (SHF), and generate sample values (SBP-D) thereof. The primary buffer unit is adapted to temporarily store the sample values (SBP-D) from the digitizing circuit and allow the processing unit to read out a first set of stored sample values (SBP-D) contemporaneously with the storing of a second set of sample values (SBP-D) in the primary buffer unit. The processing unit is adapted to receive the sample values (SBP-D) from the primary buffer unit, and based thereon, produce position/time related data (DPT).
    Type: Grant
    Filed: November 28, 2005
    Date of Patent: June 1, 2010
    Assignee: Nordnav Technologies AB
    Inventors: Jonas Paul Thor, Per-Ludvig Normark
  • Patent number: 7710221
    Abstract: In an elastic wave device including an input side electrode and an output side electrode being a resonant single-phase unidirectional transducers (RSPUDT) provided with respective pairs of bus bars opposing to each other on a piezoelectric substrate and a number of excitation electrode fingers extending in a comb-teeth shape so as to respectively cross each other from the respective bus bars, the elastic waves are repeatedly reflected and amplified between the central part of the input side electrode and the central part of the output side electrode along the direction of extension of the respective bus bars by the excitation electrode fingers of the input side electrode and the output side excitation electrode, the elastic wave device includes a damper at least on either one of the input side bus bar or the output side bus bar in an area between the central part of the input side electrode in the direction of movement of the elastic waves and the central part of the output side electrode in the direction of
    Type: Grant
    Filed: June 25, 2008
    Date of Patent: May 4, 2010
    Assignee: Nihon Dempa Kogyo Co., Ltd.
    Inventor: Ryuji Kajihara
  • Patent number: 7701114
    Abstract: A surface acoustic wave device has a duty that is greater than about 0.5, attenuation outside the pass band is increased, and an undesirable spurious response is effectively suppressed. The surface acoustic wave device includes an LiNbO3 substrate having Euler angles (0°±5°, ?±5°, 0°±10°), an electrode that is provided on the LiNbO3 substrate and that includes an IDT electrode primarily made of Cu, a first silicon oxide film that is provided in an area other than an area in which the electrode is arranged so as to have a thickness substantially equal to that of the electrode, and a second silicon oxide film that is arranged so as to cover the electrode and the first silicon oxide film, wherein the surface acoustic wave device utilizes an SH wave, wherein a duty D of the IDT electrode 3 is at least about 0.52, and ? of the Euler angles (0°±5, ?+5°, 0°±10°) is set so as to fall within a range that satisfies the following Inequality (1A) or (1B): (1) When 0.52?D?0.6, ?10×D+92.5?100×C???37.5×D2?57.75×D+104.
    Type: Grant
    Filed: December 2, 2008
    Date of Patent: April 20, 2010
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Kenji Nishiyama, Takeshi Nakao, Michio Kadota
  • Patent number: 7653118
    Abstract: A surface acoustic wave (SAW) expander based transmitter and correlator based receiver comprises SAW devices that perform expander or correlator functions based on the types of signals inputted to the SAW devices. The SAW devices incorporate chirp with adaptive interference and programmable coding capabilities. The SAW devices and method of operating the devices allow the implementation of very low power radios that overcome problems with temperature drift, lithography constraints and interference and jamming suffered by prior art implementations.
    Type: Grant
    Filed: March 23, 2005
    Date of Patent: January 26, 2010
    Assignee: Cypress Semiconductor Corporation
    Inventors: Steve Whelan, Paul Beard
  • Patent number: 7620094
    Abstract: Disclosed is a spread spectrum clock generator which includes: a first delay control type oscillator that variably controls an oscillation period at a control period interval according to a control signal; a control circuit; a maximum modulation value determination circuit that determines a maximum modulation value from a predetermined value, a frequency control signal, and a given modulation degree setting signal; a modulation signal generation circuit that receives the maximum modulation value from the maximum modulation value determination circuit and generates a modulation control signal within the maximum modulation value; and a second delay control type oscillator that receives a value obtained by adding the modulation control signal from the modulation signal generation circuit to the frequency control signal as a control signal and variably controls the oscillation period of an output clock signal at the control period interval according to the control signal.
    Type: Grant
    Filed: July 7, 2005
    Date of Patent: November 17, 2009
    Assignee: NEC Electronics Corporation
    Inventor: Satoshi Yoneda
  • Patent number: 7606294
    Abstract: Channel quality can be detected accurately in a wireless transmission system such as an HSDPA method. In the case of estimating a channel quality of a signal transmitted by a Code Division Multiple Access method and of estimating the channel quality in a system having a synchronization channel not orthogonal to a channel receiving data, a noise component of a desired channel is estimated; degree of a noise component caused by the synchronization channel is estimated with respect to the estimated noise; and a channel quality of a receiving channel is detected based on the estimated degree of the noise component.
    Type: Grant
    Filed: April 21, 2005
    Date of Patent: October 20, 2009
    Assignee: Sony Ericsson Mobile Communications Japan, Inc.
    Inventor: Takeshi Kokubo
  • Patent number: 7593450
    Abstract: A frequency hopping communications system is disclosed. A server is adapted to have one or more radio head interface modules and a call processing software module. The call processing software module performs modulation and demodulation of voice and data streams using one or more air interface standards. A radio head unit is coupled to the radio head interface module over one or more transport mediums and communicates with one or more subscriber units using the one or more air interface standards. The one or more radio head interface modules, are adapted to receive frequency channel hopping information, including a channel and a time to hop trigger, from the call processing software module for one or more of a plurality of communication channels.
    Type: Grant
    Filed: March 31, 2005
    Date of Patent: September 22, 2009
    Assignee: ADC Telecommunications, Inc.
    Inventors: David J. Conyers, Jeffrey J. Cannon, John M. Hedin, Douglas D. Weaver, Santosh K. Sonbarse, William J. Mitchell, Michael J. Hermel, Donald R. Bauman, Jerry E. Toms
  • Patent number: 7586972
    Abstract: A code division multiple access (CDMA) communication system using spread spectrum signaling over a communication bandwidth uses two different signal spectra generated using two different respective spreading code formats, such as NRZ code formatting and staggered Manchester code formatting, for respectively providing nonsplit spectra having a center peak and split spectra having a center null. The spectra are combined during transmission as a CDMA communication signal having a composite spectrum. The use of different code formats produces the composite spectrum of respective center peak and center null spectra that enables increased channel capacity.
    Type: Grant
    Filed: February 11, 2004
    Date of Patent: September 8, 2009
    Assignee: The Aerospace Corporation
    Inventors: Srinivasa H. Raghavan, Jack K. Holmes, Kristine P. Maine
  • Patent number: 7586992
    Abstract: An apparatus and method for channel estimation and CP reconstruction in an OFDM-STBC mobile communication system are provided. An ISI canceller cancels ISI signal components from first and second received symbol sequences. A cyclicity restorer cancels ICI signal components from the ISI-cancelled first received symbol sequence and the ISI-cancelled second received symbol sequence. A recoverer acquires the recovered sequence estimates of the ICI-cancelled first received symbol sequence and the ICI-cancelled second received symbol sequence by decoding. The ICI cancellation of the ISI-cancelled first and second received symbol sequences and the ISI cancellation of the second received symbol sequence are iterated a predetermined number of times.
    Type: Grant
    Filed: January 19, 2006
    Date of Patent: September 8, 2009
    Assignees: Samsung Electronics Co., Ltd, Postech Foundation
    Inventors: Jong-Hyung Kwun, Eung-Sun Kim, Jong-Hyeuk Lee, Gi-Hong Im, Hui-Chul Won
  • Patent number: 7580444
    Abstract: The invention provides an adaptive frequency hopping spread-spectrum (FHSS) transmission system and method, which efficiently utilizes available transmission bandwidth, whilst providing robustness to jamming techniques in wireless communication systems. The proposed technique operates by transmitting a wide-band signal over multiple, single-carrier, parallel transmission subbands, which may occupy non-contiguous frequency regions. The proposed scheme exhibits significant gain in error rate performance, as compared to a data rate equivalent single-subband system in the presence of signal jamming and/or interference without a reduction in the transmission data rate nor an increase in transmitter power. In addition, the proposed system and method are adaptive and enable more efficient use of the available bandwidth for communicating, thus increasing the overall bandwidth utilization of the system.
    Type: Grant
    Filed: February 17, 2006
    Date of Patent: August 25, 2009
    Assignee: Her Majesty the Queen in right of Canada, as represented by the Minister of Industry, through the Communications Research Centre Canada
    Inventors: Colin Brown, Philip Vigneron
  • Patent number: 7555029
    Abstract: A method and a standard radio wave receiver for receiving a plurality of standard radio waves respectively having signal configurations in accordance with respective specifications which define carrier channels and formats and for decoding time code signals carried by the standard radio waves. The method extracts at least part of a bit waveform common to the specifications as a extracted signal from a waveform of each of the time code signals given by each of the carrier channels, synchronizes bits to each of the time code signals in accordance with the extracted signal, determines an evaluation index indicating good or bad of a reception condition for each of the carrier channels from the bit waveform, and selects a single channel from the carrier channels in accordance with the evaluation index.
    Type: Grant
    Filed: November 29, 2005
    Date of Patent: June 30, 2009
    Assignee: Oki Semiconductor Co., Ltd.
    Inventor: Takayuki Kondo
  • Patent number: 7551665
    Abstract: An ultra wideband (UWB) receiver system operable to process a high order Gaussian pulse includes an integrator group, a correlator circuit and a comparator circuit. The integrator group includes an input coupled to receive the high order Gaussian pulse and an output coupled to the correlator circuit, the integrator group having two or more successively coupled integration stages, each integration stage operable to integrate, over a predefined time period, the signal received thereby, the integrator group operable to output, in response, a lower order Gaussian pulse. The correlator circuit is coupled to receive the lower order Gaussian pulse, and is operable to output a correlated output signal corresponding to the correlation between the lower order Gaussian pulse and a predefined reference signal.
    Type: Grant
    Filed: November 10, 2004
    Date of Patent: June 23, 2009
    Assignee: Agency for Science, Technology and Research
    Inventor: Tong Tian
  • Patent number: 7522020
    Abstract: A boundary acoustic wave device has a small thickness, which is suitable for thin apparatuses, and can be manufactured at low cost. The boundary acoustic wave device includes a first IDT electrode disposed on a first surface of a substrate, a first insulating film covering the first IDT electrode, a second IDT electrode disposed on a second surface of the substrate, and a second insulating film covering the second IDT electrode. Either the substrate or the first and second insulating films have piezoelectric characteristics.
    Type: Grant
    Filed: January 7, 2008
    Date of Patent: April 21, 2009
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Hajime Kando