Spurious Signal Or Mode Cancellation Means Patents (Class 333/151)
  • Patent number: 9484883
    Abstract: An acoustic wave device includes: a substrate; an input terminal that is located on a first surface of the substrate, and to which a high-frequency signal is input; a resonator that is connected to the input terminal, and to which a high-frequency signal input to the input terminal is input; and an insulating layer that is located between the input terminal and the substrate, and has a permittivity smaller than that of the substrate.
    Type: Grant
    Filed: December 14, 2012
    Date of Patent: November 1, 2016
    Assignee: TAIYO YUDEN CO., LTD.
    Inventors: Toshio Nishizawa, Yasuyuki Saito
  • Patent number: 9350320
    Abstract: The IDT electrode has the first bus bar and second bus bar; the plurality of first electrode fingers and the plurality of second electrode fingers mutually intersect; the plurality of first dummy electrodes and the plurality of second dummy electrodes which have front ends facing front ends of the plurality of first electrode fingers and the plurality of second electrode fingers with the gap s1; the plurality of first auxiliary electrodes which protrude laterally from the front end side portions of the pluralities of first dummy electrodes; and the plurality of second auxiliary electrodes which protrude laterally from the front end side portions of the plurality of second dummy electrodes. The plurality of first auxiliary electrodes have edge portions located a side of the second bus bar. The edge portions are located a side of the second bus bar the more to a side of the front end.
    Type: Grant
    Filed: March 13, 2012
    Date of Patent: May 24, 2016
    Assignee: KYOCERA CORPORATION
    Inventor: Tetsuya Kishino
  • Patent number: 9070963
    Abstract: A duplexer includes: a reception filter connected between a reception terminal and an antenna terminal; a transmission filter connected between a transmission terminal and the antenna terminal; and a wiring substrate including the reception filter and the transmission filter on an upper surface, the reception terminal, the transmission terminal and the antenna terminal being formed on a lower surface, and a reception electrode electrically connected to the reception terminal, a transmission electrode electrically connected to the transmission terminal, an antenna electrode electrically connected to the antenna terminal, and a circular metal layer surrounding the reception, transmission and antenna electrodes, and electrically connected to a ground being formed on an upper surface, wherein a shortest distance between a side of the circular metal layer closest to the reception and transmission terminals and the reception electrode is larger than a width of the side of the circular metal layer.
    Type: Grant
    Filed: September 11, 2012
    Date of Patent: June 30, 2015
    Assignee: TAIYO YUDEN CO., LTD.
    Inventor: Satoru Ono
  • 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: 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
  • 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: 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: 7469017
    Abstract: The present invention discloses a double TRU (Transceiver Unit) (45). The output signals from the power amplifiers (64, 84) are combined to one common output signal provided to an antenna arrangement (91). A DSP (Digital Signal Processor) (52, 72) of each TRU (50, 70) comprises means for a constant-envelope modulation scheme (54, 74) and a non-constant envelope scheme (53, 73). The DSP:s (52, 72) select the modulation scheme according to modulation information (49, 69). In such a way, a switching between different modulation schemes can be performed even on a time-slot basis. For non-constant-envelope modulation, the modulated signal is separated into two component signals. Each TRU (50, 70) takes care of the amplification of one component. A phase compensation of at least one of the TRU:s (50, 70) is performed in order to correct for different paths of phases of the power amplifiers (64, 84). The non-constant envelope modulated signal can also be a multi-carrier signal, e.g.
    Type: Grant
    Filed: March 19, 2003
    Date of Patent: December 23, 2008
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Anders Granström, Gunnar Johansson
  • Patent number: 7372897
    Abstract: The number of times for averaging operation for averaging a correlation value of a received signal and a reference signal is properly controlled. When the correlation value is not averaged, since a lower limit value TH_A of a correlation level of a distribution of timings of which a path exists is larger than an upper limit value TH_B of a correlation level of a distribution of timings of which a path does not exist, the correlation value of a path is hidden by noise. Since the averaging operation is repeated until the relation of TH_A>TH_B is satisfied, the averaging operation is stopped when the relation is satisfied. The TH_A and TH_B are decided in accordance with RSCP and ISCP of a pilot channel and RSSI of a received base band signal.
    Type: Grant
    Filed: May 14, 2004
    Date of Patent: May 13, 2008
    Assignee: Sony Ericsson Mobile Communications Japan, Inc.
    Inventor: Hiroyuki Fukada
  • Patent number: 7352800
    Abstract: A method of Partial Parallel Interference Cancellation (PPIC) is provided for recursively eliminating the Multiple Access Interference from a received signal. Such method is to use a recursion way to eliminate all the Multiple Access Interference (MAI) one by one from the received signal. Moreover, the present invention is to take the output of the pre-stage as the input of the present stage with the recursion method so that we can use only one operating circuit to obtain the function the MAI eliminating.
    Type: Grant
    Filed: May 12, 2004
    Date of Patent: April 1, 2008
    Assignee: BenQ Corporation
    Inventors: Yih-Min Chen, Hsu-Ching Wang, Chun-Cheng Chen, Fu-Yen Kuo
  • Patent number: 7180388
    Abstract: The present invention provides a surface acoustic wave device that allows a plurality of surface acoustic wave filters to be formed on a single chip and permits greater miniaturization. The surface acoustic wave device comprises a piezoelectric substrate, a first surface acoustic wave resonator formed on the piezoelectric substrate, and a second surface acoustic wave resonator formed on the piezoelectric substrate in the surface acoustic wave propagation direction of the first surface acoustic wave resonator. The positions in which the first and second surface acoustic wave resonators are formed on the piezoelectric substrate are in an at least partially overlapping relationship in a surface acoustic wave propagation region that is defined by virtually extending the respective openings of the first and second surface acoustic wave resonators.
    Type: Grant
    Filed: January 6, 2005
    Date of Patent: February 20, 2007
    Assignee: Fujitsu Media Devices Limited
    Inventors: Satoru Matsuda, Osamu Kawachi
  • Patent number: 7102381
    Abstract: An integrated circuit includes a number of terminals to transfer signals. Each of the terminals has an adjustable termination impedance. The integrated circuit also includes a control circuit coupled to the terminals to adjust the value of the termination impedance of each of the terminals to improve signal detection at the terminals.
    Type: Grant
    Filed: June 29, 2004
    Date of Patent: September 5, 2006
    Assignee: Intel Corporation
    Inventors: Feng Chen, Qiang Zhang, Zuoguo Wu
  • Patent number: 6515554
    Abstract: Electrodes are formed on both top and bottom surfaces of a dielectric plate and grounded coplanar lines, as transmission lines, are formed on the top surface of the dielectric plate. A plurality of micro-strip lines, each composed of high-impedance lines and low-impedance lines alternately connected in series, is arranged at a pitch shorter than the wavelength of a wave traveling along the grounded coplanar lines. A spurious mode propagation blocking circuit thus constructed prevents a spurious mode wave, such as a parallel-plate mode, from traveling.
    Type: Grant
    Filed: September 26, 2001
    Date of Patent: February 4, 2003
    Assignee: Murata Manufacturing Co. Ltd
    Inventors: Yohei Ishikawa, Kenichi Iio, Takatoshi Kato, Koichi Sakamoto
  • Patent number: 6323740
    Abstract: Electrodes are formed on both top and bottom surfaces of a dielectric plate and grounded coplanar lines, as transmission lines, are formed on the top surface of the dielectric plate. A plurality of micro-strip lines, each composed of high-impedance lines and low-impedance lines alternately connected in series, is arranged at a pitch shorter than the wavelength of a wave traveling along the grounded coplanar lines. A spurious mode propagation blocking circuit thus constructed prevents a spurious mode wave, such as a parallel-plate mode, from traveling.
    Type: Grant
    Filed: July 16, 1999
    Date of Patent: November 27, 2001
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Yohei Ishikawa, Kenichi Iio, Takatoshi Kato, Koichi Sakamoto
  • Patent number: 6057630
    Abstract: There is provided a surface acoustic wave device for use as a filter in a television receiver set which can reduce reflection waves generated from outermost electrodes of input and output interdigital transducers to improve various filter characteristics. In the surface acoustic wave device having, on a piezoelectric substrate, the input interdigital transducer for converting an electric signal into a surface acoustic wave and the output interdigital transducer, disposed to oppose the input interdigital transducer, for converting the surface acoustic wave resulting from the conversion by the input interdigital transducer into an electric signal, a first dummy electrode is provided to a first outermost electrode finger of the output interdigital transducer, the first outermost electrode finger being located at one end of the output interdigital transducer opposite to the input interdigital transducer, and having an electrode aperture length of .lambda.
    Type: Grant
    Filed: April 16, 1998
    Date of Patent: May 2, 2000
    Assignee: Hitachi Media Electronics Co., Ltd.
    Inventors: Hitoshi Yanagihara, Takashi Shiba, Katsumi Itoh, Akitsuna Yuhara
  • Patent number: 5905449
    Abstract: A radio switching apparatus is provided which is actuated upon reception of a radio signal and which is capable zero or near-zero standby electric power consumption. The radio switching apparatus includes a receiving antenna; a surface-acoustic-wave device to which a signal received by the antenna is fed and which extracts a specific pattern contained in the signal; a storing circuit for storing output electric power of the surface-acoustic-wave device; and a switch circuit which is turned on when the output voltage of the storing circuit exceeds a set value.
    Type: Grant
    Filed: March 6, 1997
    Date of Patent: May 18, 1999
    Assignee: Kazuo Tsubouchi
    Inventors: Kazuo Tsubouchi, Jun Hozumi, Toshiyuki Azuma
  • Patent number: 5475348
    Abstract: It consists of several channels (V1, V2) in parallel, which exhibit an inter-transducer gap difference (2.sub.1 -4.sub.1 ; 2.sub.2 -4.sub.2) equal to an even multiple of the half-wavelength (.lambda.) at the central frequency, from one channel to the next, so as to cancel the delay line transfer function which corresponds to the direct path between transducers.
    Type: Grant
    Filed: April 18, 1994
    Date of Patent: December 12, 1995
    Assignee: Thomson-CSF
    Inventors: Jean-Michel Hode, Jean Desbois, Marc Solal
  • Patent number: 5414321
    Abstract: Surface-wave arrangement (1) having at least one surface structure (21, 22), by means of which those components of surface waves (19) which are produced in the arrangement are rendered ineffective with respect to interference which would otherwise occur, for which a sump is provided in a known manner at the end of the substrate.
    Type: Grant
    Filed: September 28, 1993
    Date of Patent: May 9, 1995
    Assignee: Siemens Aktiengesellschaft
    Inventors: Isidor Schropp, Kimon Anemogiannis, Giuliano Visintini
  • Patent number: 5387833
    Abstract: A method and apparatus in which signal output of an acoustic wave device is separated into desired and undesired components. An excitation signal to an input of the acoustic wave device is periodically interrupted for durations based upon the time required for acoustic waves to travel from the input to the output of the device. The duration of excitation is less than the time required for wave travel, allowing electromagnetic interference to complete its passage to the output before the arrival of acoustic wave energy. The non-simultaneous arrival of electromagnetic interference and acoustic wave-generated energy allows the electromagnetic interference to be gated from the output. Electrical switches are employed, such as double-balanced mixers or PIN diode switches. The period of pulses for providing the interruptions of excitation is at least as great as the sum of the required time for acoustic wave travel and the time during which the device is excited.
    Type: Grant
    Filed: June 14, 1994
    Date of Patent: February 7, 1995
    Assignee: Hewlett-Packard Company
    Inventor: Richard L. Baer
  • Patent number: 5367216
    Abstract: A surface acoustic wave element is provided with a piezoelectic substrate, a first input transducer, a second input transducer and an output device such as output electrode. The piezoelectric substrate has a first and a second surfaces which are mutually faced. The first input transducer is formed on the first surface of the substrate to generate a first surface acoustic wave which propagates in a predetermined direction. The second transducer is formed on the first surface of the substrate to generate a second surface acoustic wave which propagates in a direction opposite to the predetermined direction. The output device is formed on the first surface of the substrate to extract a signal produced by an interaction of the first and second surface acoustic waves. At least part of the second surface of the substrate is caused to be inclined in a direction perpendicular to the predetermined direction with respect to the first surface.
    Type: Grant
    Filed: July 30, 1992
    Date of Patent: November 22, 1994
    Assignee: Canon Kabushiki Kaisha
    Inventors: Koichi Egara, Kenji Nakamura, Norihiro Mochizuki
  • Patent number: 5349260
    Abstract: A two track surface wave arrangement has improved selection property resulting from crosstalk signals of parasitic transmission paths within the arrangement being suppressed. What can be achieved with a displacement of the surface wave arrangement of one track relative to that of the other track by a dimension of nearly half a wavelength is that crosstalk signals mutually cancel on the basis of interference without affecting the useful signal.
    Type: Grant
    Filed: April 20, 1993
    Date of Patent: September 20, 1994
    Assignee: Siemens Aktiengesellschaft
    Inventors: Kimon Anemogiannis, Giuliano Visintini
  • Patent number: 5306978
    Abstract: In a surface acoustic wave transducer including a substrate made of a piezoelectric material, an input side IDT structure having positive and negative electrodes arranged in an interdigit manner and floating electrodes arranged between successive positive and negative electrodes, and an output side IDT structure having positive and negative electrodes arranged in an interdigit manner and floating electrodes arranged between successive positive and negative electrodes, the electrodes of the input and output side IDT structures are arranged such that a surface acoustic wave propagates in one direction, distances between corresponding tracks in the input and output side IDT structures are linearly changed and lengths of these tracks are changed in accordance with a predetermined window function.
    Type: Grant
    Filed: May 21, 1993
    Date of Patent: April 26, 1994
    Assignees: Kazuhiko Yamanouchi, NGK Insulators, Ltd.
    Inventors: Kazuhiko Yamanouchi, Mitsuhiro Tanaka
  • Patent number: 5173667
    Abstract: A multiple-reflection, long-path wave transmission device is fabricated from a single crystal silicon plate by micromachining straight walled rectangular cavities into the plate to reflect ultrasonic waves along an extended transmission path defined by the rectangular cavities. An input transducer is coupled to the silicon plate to introduce ultrasonic waves into the plate in response to an input signal. The ultrasonic waves travel in the silicon plate along the transmission path defined by the straight walled reflective cavities. An output transducer is similarly coupled to the silicon plate to receive the ultrasonic waves at the completion of the transmission path and to generate an output signal representative thereof. Additional sloped wall cavities are formed in the silicon plate to border the extended transmission path. The sloped wall cavities prevent cross coupling of waves traveling in different portions of the path and absorb energy traveling in undesired directions and modes.
    Type: Grant
    Filed: February 19, 1991
    Date of Patent: December 22, 1992
    Assignee: Ford Motor Company
    Inventor: Allen H. Meitzler
  • Patent number: 5162689
    Abstract: An acoustic transducer for an acoustic wave device which includes an acoustic wave propagating substrate, the transducer adapted to couple to an electrical load and/or source. The transducer includes at least a pair of comb electrodes formed on the substrate. It includes apparatus for applying an electrical load and/or source across the pair of comb electrodes. The first of the combs has a plurality of electrode fingers. The second comb has at least one electrode finger. The widths of the electrode fingers are the same. Gaps of at least two different widths are disposed between the electrodes.
    Type: Grant
    Filed: May 1, 1991
    Date of Patent: November 10, 1992
    Assignee: Motorola, Inc.
    Inventors: Frederick M. Fliegel, David Penunuri, Thomas S. Hickernell
  • Patent number: 5153476
    Abstract: Biasing electrodes on a piezoelectric acoustic vibrator alter the sensitivity of the acoustic vibrator and can be used to compensate for external stresses applied to the acoustic vibrator. The biasing electrodes and the circuitry providing electric signals to them are separate from the RF circuitry feeding the RF signal electrodes of the acoustic vibrator. Biasing electrodes can be used on bulk acoustic wave devices or surface acoustic wave devices. The biasing electrodes can be energized by a static D.C. voltage source, or can be used in a dynamic biasing arrangement to provide instantaneous compensation for changing environmental conditions.
    Type: Grant
    Filed: March 11, 1991
    Date of Patent: October 6, 1992
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: John A. Kosinski
  • Patent number: 5126706
    Abstract: A surface device with a conversion structure (12) mounted on the substrate (2) but outside the surface of the substrate provided for surface wave propagation. The conversion structure eliminates undesirable surfaces which occur.
    Type: Grant
    Filed: May 9, 1990
    Date of Patent: June 30, 1992
    Assignee: Siemens Aktiengesellschaft
    Inventors: Bernd Fleischmann, Gerd Riha
  • Patent number: 5111167
    Abstract: A surface acoustic wave device employs in-line input and output transducers disposed on a piezoelectrically active surface. Two U-configured multi-strip couplers are disposed between the input and output transducers in an overlapped, opposing configuration in order to convolve the side lobe energy from the input transducer across substantially all of the aperture of the output transducer.
    Type: Grant
    Filed: November 13, 1990
    Date of Patent: May 5, 1992
    Assignee: Sawtek, Inc.
    Inventor: Hunter W. Menning
  • Patent number: 4999535
    Abstract: A surface acoustic wave (SAW) transducer comprises a piezoelectric substr, a pair of metal bus bars positioned on the substrate parallel to and separated from each other a preselected distance and a plurality of interdigital electrode fingers extending from each of the metal bus bars. A plurality of slots are positioned along each metal bus bar so that the bus bar metallization is reduced and the acoustic wave velocity is increased in the metal bus bar region.
    Type: Grant
    Filed: September 25, 1989
    Date of Patent: March 12, 1991
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Elio A. Mariani, Clinton S. Hartmann
  • Patent number: 4993000
    Abstract: A surface acoustic wave device according to the present invention can be molded surely with resin, leaving a free space over exciting portions and a propagating portion by disposing a recess portion formed over the exciting portions and the propagating portion on a piezoelectric substrate without using any metallic package.
    Type: Grant
    Filed: December 22, 1989
    Date of Patent: February 12, 1991
    Inventors: Teruo Niitsuma, Syuichi Mitsutsuka
  • Patent number: 4960329
    Abstract: The difficulty of making Doppler shift velocity measurements in a chirp pulse echo ranging system is overcome by employing a pulse frequency compression filter, suitably a SAW compressor 45, having individual outputs 64, 65, 66, 67 respectively relating to adjacent contiguous frequency bands A, B, C, D, (FIG. 3) each having a bandwidth approximately equal to the chirp frequency swing. Signal detection and processing means 70 senses the occurrence of a compressed pulse on any of the outputs and measures the amplitudes of signals on all the outputs. A computer then computes the Doppler shift from the amplitude ratio of the sensed signals to adjacent frequency bands, determines the target velocity therefrom and uses the result also to correct the range measured by the counter 5.
    Type: Grant
    Filed: August 15, 1988
    Date of Patent: October 2, 1990
    Assignee: U.S. Philips Corporation
    Inventor: John M. S. Schofield
  • Patent number: 4945354
    Abstract: The invention features a theft resistant security system for motor vehicles. The system has receptacle with a coupling coil. A SAW (surface acoustical wave) device associated with the receptacle for relative movement thereto is also provided. The SAW device has a code and its own coupling coil for interaction with the receptacle coupling coil. A testing mechanism is connected to the receptacle for determining whether the code of the SAW device is valid for operation of the motor vehicle. Problems of crosstalk and wave reflection may produce spurious code pulses in systems of this type. The invention provides techniques for eliminating or reducing these unwanted pulses.
    Type: Grant
    Filed: November 25, 1988
    Date of Patent: July 31, 1990
    Assignee: GTE Products
    Inventor: James R. McColl
  • Patent number: 4933588
    Abstract: A technique for adjusting the frequency of odd mode transverse waves propagating in a SAW device is described. A pair of localized regions of frequency determining trimming material are deposited onto selected portions of a surface wave propagating surface, to provide localized regions on said surface where the odd order transverse mode has energy maxima. These regions change the acoustic properties and hence the velocity characteristics of the surface wave propagating surface in said regions. The frequency of the odd mode transverse wave is changed accordingly and is preferably changed to match that of the fundamental transverse propagating wave. This decreases the insertion loss of the device at the fundamental frequency and eliminates the odd mode transverse wave propagation characteristic within the operating frequency range of the resonator.
    Type: Grant
    Filed: December 23, 1988
    Date of Patent: June 12, 1990
    Assignee: Raytheon Company
    Inventor: James A. Greer
  • Patent number: 4931752
    Abstract: A surface acoustic wave (SAW) device is provided which includes a piezoelectric substrate, an input transducer formed on the substrate for launching acoustic surface waves along a propagation path on the substrate, an output transducer formed on the substrate across the propagation path from the input transducer for receiving acoustic surface waves generated by the input transducer, and at least one area of acoustic energy absorbing material, preferably polyimide, formed on the substrate between the edge of the substrate and a corresponding transducer. The acoustic absorber is patterned on the SAW device substrate while the device is still in wafer form using photolithographic processing techniques.
    Type: Grant
    Filed: September 30, 1987
    Date of Patent: June 5, 1990
    Assignee: Hewlett-Packard Company
    Inventors: Robert C. Bray, Catherine A. Johnsen, Timothy L. Bagwell, Waguih S. Ishak
  • Patent number: 4912356
    Abstract: A SAW slanted array correlator (SAC) comprises a piezoelectric substrate, an input and an output interdigital transducer deposited on the piezoelectric substrate, and a reflective array aligned with the transducers. The input and output transducer are slanted at equal and opposite appropriate angles to each other. The reflective array is disposed on the substrate at an angle the same as the angle of emplacement of the output transducer. The transducers comprise a number of interdigital electrodes with varying periodicity, the periodicity being the same for corresponding portions of the two transducers. The reflective array comprises a number of shorted interdigital electrodes having a periodicity corresponding to the periodicity of the output transducer. The reflective array comprises portion of selected electrodes which are active, partially active or inactive.
    Type: Grant
    Filed: May 18, 1989
    Date of Patent: March 27, 1990
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Elio A. Mariani, William J. Skudera, Jr.
  • Patent number: 4882715
    Abstract: In a surface acoustic wave elastic convolver capable of showing sufficiently high convolution efficiency with a simple structure, the convolver comprises a piezo-electric substrate, plural input transducers formed on the substrate for respectively generating surface acoustic waves corresponding to input signals, an output transducer for obtaining a convolution signal of the input signals, from a surface acoustic wave generated by non-linear interaction, of the surface acoustic waves generated by those input transducers, and a dielectric film of a non-linear effect larger than that of the substrate, formed on the substrate in at least an area where the output transducer is formed.
    Type: Grant
    Filed: March 11, 1988
    Date of Patent: November 21, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventors: Koichi Egara, Norihiro Mochizuki, Kenji Nakamura, Kazuo Yoshinaga
  • Patent number: 4870312
    Abstract: A surface wave acoustic delay line is formed of a set of electrode assemblies disposed on the surface of a block of crystalline material propagative of a surface acoustic wave. In each of the assemblies, the electrodes are arranged in an interdigitated pattern. Reflected waves are cancelled by the construction of an additional electrode in each of an electrode assembly, the additional electrode extending only one-half the distance of the other electrodes and being spaced from an adjacent electrode by one-quarter wavelength. This introduces a 180.degree. phase shift between portions of relected waves which then cancel to remove the reflection. Also, in the case of closely spaced electrode assemblies, additional electrodes, equal in shape and size to the electrodes of the assemblies, are introduced between the assemblies in the form of a grid which propagates surface waves without reflection.
    Type: Grant
    Filed: February 19, 1987
    Date of Patent: September 26, 1989
    Assignee: Hazeltine Corporation
    Inventors: Richard La Rosa, Thomas J. Marynowski
  • Patent number: 4859996
    Abstract: A system for recognizing touch positions along a predetermined coordinate axis includes a surface wave propagating substrate on which is disposed at least one surface wave transducer. An array of surface wave reflective elements directs the surface wave from the transducer. The reflective elements are composed of a frit material.
    Type: Grant
    Filed: January 20, 1987
    Date of Patent: August 22, 1989
    Assignee: Zenith Electronics Corporation
    Inventors: Robert Adler, Mark Fogelson, Sam Kaplan
  • Patent number: 4803448
    Abstract: A cantilever mount for a substrate lamina of a surface wave device wherein the substrate lamina 42 of the component is attached only at its one end 45 and is a wedge-shaped structure. The tapered end 46 of the substrate lamina 42 which is remote from the atachment location is mounted above the surface 41 of the base plate 41 which causes minimization of disturbing influences.
    Type: Grant
    Filed: December 14, 1987
    Date of Patent: February 7, 1989
    Assignee: Siemens Aktiengesellschaft
    Inventors: Peter Zibis, Wolfgang Pahl
  • Patent number: 4801872
    Abstract: A guided-wave acoustooptic spectrum analyzer comprises a planar optical waveguide layer with electrodes of a transducer thereon. The electrodes are positioned at the center of a light path under which light is propagated. The light is deflected in response to frequencies of electric signals applied to the electrodes. With the invention, the detectable minimum pulses width of a pulse signal is reduced as compared with the prior art, while the frequency resolution therein is maintained at the same level.
    Type: Grant
    Filed: July 8, 1987
    Date of Patent: January 31, 1989
    Assignee: NEC Corporation
    Inventor: Toshihiko Kitano
  • Patent number: 4775846
    Abstract: In order to present an asymmetric frequency characteristic in an unidirectional acoustic surface wave device with a simple external phase shifter, a transducer formed on a substrate have three interaction areas (acoustic sources) defined by different three electrodes, first electrode being common, second electrode being connected to one end of the phase shifter, third electrode being connected to another end of the phase shifter, and distances between interaction areas being unequal to 2n (n:integer).
    Type: Grant
    Filed: September 16, 1987
    Date of Patent: October 4, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Takashi Shiba, Yuji Fujita, Toshimitsu Takahashi, Jun Yamada
  • Patent number: 4773138
    Abstract: An improved manufacturing technique for producing a certain class of Surf Acoustic Wave (SAW) devices, namely those having input and output transducers in close proximity. A much higher manufacturing yield results from eliminating the cutting of a slot in the substrate between input and output transducers as formerly done. This frequently destructive step is replaced by ion-milling of a deep groove between the ports and backfilling with a metal of proper configuration to provide elecromagnetic shielding. The technique produces a new device that is at least equal to the prior art in rejection of unwanted couplings between input and output.
    Type: Grant
    Filed: July 27, 1983
    Date of Patent: September 27, 1988
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Arthur D. Ballato, Elio A. Mariani
  • Patent number: 4764701
    Abstract: A multichannel surface acoustic wave encoder/decoder having a common electrical input is designed so that the insertion losses of the channels differ despite the apparent design constraint of closely matched channel output impedances. The input transducing device or SAW transmitter is divided into individual transducers (or into subtransducers) having different numbers of finger overlaps, thus achieving different acoustic output levels which in turn result in different insertion losses for different channels. The finger spacing of the SAW transmitters can differ between the respective input transducers or subtransducers so as to optimize the center frequency of each channel.
    Type: Grant
    Filed: December 30, 1986
    Date of Patent: August 16, 1988
    Assignee: Zenith Electronics Corporation
    Inventors: Michael J. Garbacz, Kai Hansen
  • Patent number: 4752709
    Abstract: A surface acoustic wave device comprising a surface acoustic wave substrate member composed by forming an aluminum oxide film and a thin zinc oxide film successively on a glass substrate. The thickness h.sub.1 of the aluminum oxide film and the thickness h.sub.2 of the zinc oxide film are set within ranges of 0.1.ltoreq.h.sub.1 /.lambda..ltoreq.10 and 0.05.ltoreq.h.sub.2 /.lambda..ltoreq.0.35 (where .lambda. is representative of wavelength of Sezawa wave) respectively, thereby to utilize Sezawa wave or a similar mode wave transmitted on the surface acoustic wave substrate member in multi-layer structure.
    Type: Grant
    Filed: January 29, 1987
    Date of Patent: June 21, 1988
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Satoru Fujishima, Hideharu Ieki
  • Patent number: 4736172
    Abstract: In a directional transducer for SAW filters on a piezoelectric substrate, the transducer is formed of a plurality of groups which are connected in half-groups to busbars for two phases. The half-groups are alternately distributed into two or more channels such that the finger electrodes of each phase form a more or less gap-free series as viewed over all channels. A common, meandering busbar for both phases is associated with each channel.
    Type: Grant
    Filed: May 2, 1986
    Date of Patent: April 5, 1988
    Assignee: Siemens Aktiengesellschaft
    Inventor: Josef Ebneter
  • Patent number: 4694266
    Abstract: A notch filter which utilizes a quadrature coupler with the input signal on one of its four terminals, a first tuned surface acoustic wave device coupled to a second on of the terminals for receiving the input signal at 0.degree. phase shift, a second tuned surface acoustic wave device coupled to a third one of the terminals for receiving the input signal with a 90.degree. phase shift and the fourth terminal being utilized as the output signal terminal.
    Type: Grant
    Filed: July 29, 1986
    Date of Patent: September 15, 1987
    Assignee: R. F. Monolithic, Inc.
    Inventor: Peter V. Wright
  • Patent number: 4689586
    Abstract: A surface acoustic wave (SAW) device comprises a piezo-electric surface acoustic substrate, and plural sets of input/output interdigital electrodes disposed on the substrate. A phase shifter is provided between a sending electrode and a reflecting electrode included in the input or output interdigital electrodes for producing an electrical phase difference to implement a unidirectional electrode. The sending electrode and the reflecting electrode are mutually connected through the phase shifter including two pure reactance elements serially connected between the sending and the reflecting electrodes and a pure reactance element connected to the junction between the two serially connected reactance elements so as to form a T-circuit. When the two serially connected pure reactance elements are selected equal to each other, the operating frequency band is broadened. The phase shifter includes no ohmic resistance and thus is lossless.
    Type: Grant
    Filed: June 2, 1986
    Date of Patent: August 25, 1987
    Assignee: Hitachi, Ltd.
    Inventors: Jun Yamada, Akitsuna Yuhara, Takashi Shiba, Yuji Fujita
  • Patent number: 4684841
    Abstract: Each IDT (inter-digital transducer) of a SAW (surface acoustic wave) device is formed on a thin resistive doped silicon film having the same pattern as the IDT, which improves adhesion of the IDT to the substrate. The silicon film also constitutes electroacoustic absorbers between the IDTs and edges of the substrate, and can have a linearly tapered edge adjacent to each IDT to suppress reflections at the absorber boundary. The SAW device is formed by sputtering silicon onto the substrate, subsequently forming the IDTs, and then etching the silicon from areas where it is not wanted.
    Type: Grant
    Filed: April 1, 1985
    Date of Patent: August 4, 1987
    Assignee: Northern Telecom Limited
    Inventors: Grantley O. Este, Mark S. Suthers, Richard W. Streater, Blair K. MacLaurin
  • Patent number: 4672338
    Abstract: An electrical surface acoustic wave filter with a wafershaped substrate (1) of monocrystalline, piezoelectric material, in particular lithium niobate, wherein one substrate side supports interdigital transducers (IW 1, IW 2) with metallic electrodes mutually engaging in comblike fashion for the stimulation and coupling out of the surface waves and with plastic and/or elastic damping compounds (10, 11) for the suppression of disturbing wave reflections. The damping compound (10, 11) is applied indirectly or directly to the substrate surface between the active interdigital transducer area "b" and the adjacent long substrate edges (4, 5) of at least one interdigital transducer (IW 1), and that at least in the inactive interdigital transducer areas (a, a).
    Type: Grant
    Filed: December 5, 1985
    Date of Patent: June 9, 1987
    Assignee: Siemens Aktiengesellschaft
    Inventor: Werner Faber
  • Patent number: RE32859
    Abstract: Acoustic surface wave devices of a novel class characterized by the provision of coupling means comprising at least several spaced filamentary electrical conductors extending over a first region and a second region for causing acoustic surface waves propagated across the coupling means in the first region to interact with acoustic surface waves propagated across the coupling means in the second region, by means of alternating electric signals induced on the filamentary electric conductors. The regions to be coupled are preferably formed on piezoelectric material, but modified forms of the coupling means can be made operable with other materials and suitable biassing fields.
    Type: Grant
    Filed: January 12, 1987
    Date of Patent: February 7, 1989
    Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
    Inventors: Frank G. Marshall, Edward G. S. Paige