Significant Transmitting Or Receiving Transducer Structure Patents (Class 333/154)
  • Patent number: 8669832
    Abstract: An acoustic wave device includes an interdigital transducer (IDT) electrode and a separate electrode facing the IDT electrode. The IDT electrode includes first and second comb-shaped electrode facing each other. The first comb-shaped electrode includes a first bus bar, first interdigitated electrode fingers, and first dummy electrode fingers. The second comb-shaped electrode includes a second bus bar second interdigitated electrode fingers interdigitated with the first interdigitated electrode fingers, second dummy electrode fingers facing the first interdigitated electrode fingers, weighted parts, and a non-weighted part. The weighted parts have electrodes at spaces between the second interdigitated electrode fingers and the second dummy electrode fingers. In the non-weighted part, there is no electrode at a space out of the spaces which is closest to the separate electrode in the non-interdigitated region.
    Type: Grant
    Filed: February 23, 2010
    Date of Patent: March 11, 2014
    Assignee: Panasonic Corporation
    Inventors: Hiroki Kamiguchi, Hidekazu Nakanishi, Yosuke Hamaoka, Shoji Okamoto, Hiroyuki Nakamura
  • Patent number: 8463185
    Abstract: A system is for encoding information on a passive surface acoustic wave (SAW) device. The system includes a requesting unit configured to wirelessly transmit an impulse signal. The impulse signal is a signal that includes only a single pulse. A SAW device has an interdigital transducer (IDT) configured to physically store coded data. The SAW device is configured to receive the impulse signal. In response to receiving the impulse signal, the SAW device excites the IDT to generate a coded signal that includes the stored coded data and frequency components at a fundamental frequency.
    Type: Grant
    Filed: August 1, 2012
    Date of Patent: June 11, 2013
    Assignee: Research In Motion Limited
    Inventors: Peter J. Edmonson, Colin K. Campbell
  • Patent number: 8260204
    Abstract: A system is for encoding information on a passive surface acoustic wave (SAW) device. The system includes a requesting unit configured to wirelessly transmit an impulse signal. The impulse signal is a signal that includes only a single pulse. A SAW device has an interdigital transducer (IDT) configured to physically store coded data. The SAW device is configured to receive the impulse signal. In response to receiving the impulse signal, the SAW device excites the IDT to generate a coded signal that includes the stored coded data and frequency components at a fundamental frequency.
    Type: Grant
    Filed: December 14, 2011
    Date of Patent: September 4, 2012
    Assignee: Research In Motion Limited
    Inventors: Peter J. Edmonson, Colin K. Campbell
  • Patent number: 8099048
    Abstract: A system is for encoding information on a passive surface acoustic wave (SAW) device. The system includes a requesting unit configured to wirelessly transmit an impulse signal. The impulse signal is a signal that includes only a single pulse. A SAW device has an interdigital transducer (IDT) configured to physically store coded data. The SAW device is configured to receive the impulse signal. In response to receiving the impulse signal, the SAW device excites the IDT to generate a coded signal that includes the stored coded data and frequency components at a fundamental frequency.
    Type: Grant
    Filed: May 12, 2010
    Date of Patent: January 17, 2012
    Assignee: Research In Motion Limited
    Inventors: Peter J. Edmonson, Colin K. Campbell
  • Patent number: 7994878
    Abstract: Boundary acoustic wave devices are both compact and possess excellent temperature stability. Yet these devices have the drawback that the Q value cannot be raised, and a high cost thin-film technology is required. This invention provides a boundary acoustic wave device possessing excellent Q value along with a low cost. A boundary acoustic wave device including a film whose main ingredient is aluminum at a thickness hm, and a shorting reflector (thickness hr) and a IDT with an electrode finger period of lambda, are patterned onto the surface of a theta YX-LN single crystalline piezoelectric substrate; and a silicon oxide film with a thickness h1 and an aluminum nitride film 6 with a thickness h2 are formed on that comb electrode and reflector, wherein: 2.5?hr/??8.5% is obtained.
    Type: Grant
    Filed: May 28, 2009
    Date of Patent: August 9, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Atsushi Isobe, Kengo Asai
  • Patent number: 7880543
    Abstract: A data transmitting circuit includes a reflection suppressive component generating circuit for generating a reflection suppressive component for suppressing the reflection caused by the discontinuity in the characteristic impedance on a transmission line, and a data output circuit for amplifying the reflection suppressive component and the data to be currently transmitted to a receiving side and outputting them to the transmission line.
    Type: Grant
    Filed: February 25, 2009
    Date of Patent: February 1, 2011
    Assignee: Fujitsu Limited
    Inventors: Hisakatsu Yamaguchi, Yoshiyasu Doi, Hirotaka Tamura
  • Patent number: 7755489
    Abstract: An intelligent packaging system utilizing acoustic wave devices includes an electronic module, a SAW ID, various passive SAW sensors and a printed antenna. The passive SAW sensors include a SAW pressure sensor, a SAW temperature sensor and one or more SAW chemical sensors for monitoring physical parameters of a package content. The electronic module generally includes a printed large area distributed electrical circuit, an impedance transformer and a SAW transponder for realizing passive wireless monitoring of the structural integrity of the package. A separate power harvesting antenna and/or a separate dual band antenna can generate radio frequency (RF) power for biasing components associated with the electronic module.
    Type: Grant
    Filed: April 28, 2008
    Date of Patent: July 13, 2010
    Assignee: Honeywell International Inc.
    Inventors: Ion Georgescu, Cornel Cobianu, Viorel-Georgel Dumitru
  • Patent number: 7747220
    Abstract: An IDT produces a SAW when excited by a single electrical pulse and can be fabricated to embody a code, which code provides for a passive autocorrelation of a SAW input to the IDT and thereby lends itself to further application as a signal generator in a communication device. However, internal dimensions of IDTs are inversely proportional to operating frequency, such that high frequency IDTs present significant manufacturing difficulties. Fabrication of IDTs for high frequency applications is simplified by exploiting a harmonic frequency SAW generated by IDTs. An IDT may therefore be designed according to fundamental frequency internal dimension criteria but can operate at a multiple of the fundamental frequency, thereby providing much higher frequency operation than conventional SAW systems. Operation of a second harmonic SAW system at 2.4 GHz based on a fundamental frequency of 1.2 GHz is contemplated.
    Type: Grant
    Filed: September 28, 2007
    Date of Patent: June 29, 2010
    Assignee: Research In Motion Limited
    Inventors: Peter J. Edmonson, Colin K. Campbell
  • 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: 7187251
    Abstract: A direct current (DC) isolated phase inverter and a ring hybrid coupler including the DC isolated phase inverter is provided. The ring hybrid coupler including the DC isolated phase inverter comprising: a first, second, third and fourth transmission line arm; a first port connected to the first arm, second port connected to the second arm, third port connected to the third arm and fourth port connected to the fourth arm; and a DC phase inverter inserted within one of the first, second, third and fourth arms, wherein the DC phase inverter comprises: a transmission line comprising a plurality of signal and ground traces, wherein the plurality of signal and ground traces are interchanged; and a plurality of capacitors disposed in series with the ground traces, wherein the plurality of capacitors isolate the DC phase inverter from a device connected to the transmission line.
    Type: Grant
    Filed: March 16, 2005
    Date of Patent: March 6, 2007
    Assignee: International Business Machines Corporation
    Inventors: Mohan K. Chirala, Brian A. Floyd, Thomas M. Zwick
  • Patent number: 7053524
    Abstract: A surface acoustic wave sensor or identification device has a piezoelectric material, and an interdigitated transducer (IDT) input/output mounted on the piezoelectric material for receiving a radio frequency (RF) signal and propagating a corresponding surface acoustic wave along a surface of the piezoelectric material. An IDT finger electrode array is mounted on the piezoelectric material and is operable to communicate with the IDT input/output for transmission of a modified RF signal from the device. The IDT finger electrode array has at least one finger electrode segment whose propagating characteristics are controlled to control the nature of the modified RF signal. A biolayer is mounted on the piezoelectric material and is associated with the finger electrode segment, and a fluidic chamber is associated with the biolayer.
    Type: Grant
    Filed: May 31, 2005
    Date of Patent: May 30, 2006
    Assignee: P.J. Edmonson Ltd.
    Inventors: Peter J. Edmonson, Colin K. Campbell, William D. Hunt
  • Patent number: 6967545
    Abstract: Surface acoustic wave (SAW) zebra-wave-guide (10) implemented as an array of interdigitized electrode fingers, wherein the array has internal inter-finger connectors (18) providing inside electrical shorting of part of fingers (16) remaining other fingers (14) to be isolated, moreover, the array (12) is bordered by important free surface spaces (15). Time delay and phase of the propagating SAW beam front are controlled by the varying of quantity of isolated fingers (14) of the zebra-wave-guide (10). Aggregation (40) of the parallel zebra-wave-guides having different quantities of isolated fingers (14) and different widths allows manipulations with narrow SAW beams' phases and magnitudes, that becomes helpful degree of freedom for desire transformation of the SAW beam (140).
    Type: Grant
    Filed: November 29, 2001
    Date of Patent: November 22, 2005
    Inventor: Yuri Abramov
  • Patent number: 6967428
    Abstract: A surface acoustic wave sensor or identification device has a piezoelectric substrate, an interdigitated transducer (IDT) input/output mounted on a substrate for receiving a radio frequency (RF) signal and propagating a corresponding surface acoustic wave along a surface of the substrate. An IDT reflector array is mounted on the substrate and operable to receive a surface acoustic wave and reflect the surface acoustic wave in modified form back to the IDT input/output for transmission of a corresponding modified RF signal from the device. The IDT reflector array has at least one reflector segment whose reflectivity characteristics are controlled to control the nature of the modified RF signal.
    Type: Grant
    Filed: December 9, 2003
    Date of Patent: November 22, 2005
    Assignee: P. J. Edmonson Ltd.
    Inventors: Peter J. Edmonson, Colin K. Campbell
  • Patent number: 6937114
    Abstract: A surface acoustic wave device includes a piezoelectric substrate and an electrode provided on the substrate. The electrode includes a first metal layer provided on the piezoelectric substrate and having a trapezoid shape in the cross section and a second metal layer provided over the piezoelectric substrate at the same position as the first metal layer over the piezoelectric substrate. By controlling the shape of side surfaces of the electrode, the surface acoustic wave device hardly vary in a propagation frequency.
    Type: Grant
    Filed: December 25, 2002
    Date of Patent: August 30, 2005
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Mitsuhiro Furukawa, Kiyoharu Yamashita, Hiroshi Kurotake, Hiroyoshi Sekiguchi
  • Patent number: 6856214
    Abstract: Very low passband ripple is provided in a wide bandwidth high frequency SAW FIR filter using slanted finger IDTs by one or more of three techniques: cancelling regenerated SAWs at parallel-connected input IDTs of two SAW filters which are similar except for a quarter-wavelength difference in spacing of the input and output IDTs, this difference varying with wavelength across the IDT aperture; shaping edges of shield electrodes to provide quarter-wavelength differences in, and hence cancellation of, SAWs reflected at the edges, the differences varying with wavelength across the IDT aperture; and making pairs of slanted shield electrodes symmetrical to compensate for refraction of SAWs by the shield electrodes.
    Type: Grant
    Filed: December 10, 2002
    Date of Patent: February 15, 2005
    Assignee: Nortel Networks Limited
    Inventors: Chun-Yun Jian, Steve A. Beaudin, Somsack Sychaleun
  • Patent number: 6815867
    Abstract: A base material made of C-faced sapphire single crystal is set on a susceptor installed in a reactor arranged horizontally. Then, a trimethyl-aluminum and an ammonia are introduced as raw material gases into the reactor and supplied onto the substrate, to form an AlN film. In this case, the temperature of the base material is set to 1100° C. or over, and the ratio (V raw material gas/III raw material gas) is set to 800 or below, and the forming pressure is set within a range of 7-17 Torr. As a result, the crystallinity of the AlN film is developed to 90 arcsec or below in FWHM of X-ray rocking curve, and the surface flatness of the AlN film is developed to 20 Å or below. Therefore, a substrate composed of the base material and the AlN film is preferably usable for an acoustic surface wave device, and if the substrate is employed, the deviation from the theoretical propagation velocity is set to 1.5 m/sec or below.
    Type: Grant
    Filed: November 30, 2001
    Date of Patent: November 9, 2004
    Assignee: NGK Insulators, Ltd.
    Inventors: Tomohiko Shibata, Yukinori Nakamura, Mitsuhiro Tanaka
  • Patent number: 6788204
    Abstract: The invention relates to a surface-wave transducer device—also called TAGs—and to identification systems with this device. DE 42 17 049 discloses a passive surface sensor which can be interrogated in wireless mode. In this context, energy is transmitted by radio to the sensor using an interrogation device, the interrogation being done by means of chirped transmission signals. The sensor has transducers and reflectors. The reflectors reflect the chirp signal in a time-staggered sequence, so that the sensor returns a time-staggered chirp signal to the interrogation device. The reflection principle means that the surface-wave sensor described above (also called SAW—surface acoustic wave—sensor in the following text) has a very high insertion loss of the order of 50 dB, for example.
    Type: Grant
    Filed: March 2, 2000
    Date of Patent: September 7, 2004
    Assignee: Nanotron Gesellschaft fur Mikrotechnik mbH
    Inventors: Zbigniew Ianelli, Manfred Koslar
  • Patent number: 6727767
    Abstract: A voltage controlled oscillator is provided. The oscillator includes a surface acoustic wave element for forming a feedback circuit for an amplifier, and a phase adjustment circuit including a filter which is interposed in the feedback circuit. The oscillator also has a phase shifter including a hybrid coupler to which an additional control part is attached for changing a phase value within an oscillation loop with a control voltage supplied from an external source. An equal power divider equally distributes output power within the oscillation loop and supplies the output power outside the oscillation loop. A multi-layer board is used for mounting the amplifier, surface acoustic wave element, phase adjustment circuit, phase shifter, and equal power divider in at least two separate layers.
    Type: Grant
    Filed: September 10, 2002
    Date of Patent: April 27, 2004
    Inventor: Yutaka Takada
  • Patent number: 6710683
    Abstract: A surface acoustic wave filter has a piezoelectric substrate and at least two interdigital transducer electrodes on the piezoelectric substrate, wherein at least one of the interdigital transducer electrodes includes a unidirectional electrode and bidirectional electrode, and the length &lgr;d of a basic cell of the unidirectional electrode is longer than the length &lgr;s of a basic cell of the bidirectional electrode.
    Type: Grant
    Filed: April 1, 2002
    Date of Patent: March 23, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroyuki Nakamura, Toru Yamada, Kazunori Nishimura, Tsutomu Igaki, Shigeru Tsuzuki, Ken Matsunami, Toshio Ishizaki
  • Patent number: 6640636
    Abstract: An ultrasound radiating and receiving device comprises a piezoelectric substrate, an interdigital arrangement of first and second comb-shaped electrodes, and a counter electrode. The interdigital arrangement is mounted on an upper end surface of the piezoelectric substrate. The counter electrode is formed on a lower end surface of the piezoelectric substrate, and is in contact with a surface-part of a material through the lower end surface of the counter electrode. When an input electric signal is applied between the first comb-shaped electrode and the counter electrode, a longitudinal wave is radiated into the material through the surface-part of the material along the direction vertical to the lower end surface of the piezoelectric substrate. If the longitudinal wave is reflected at an object located inside the material, a reflected longitudinal wave is detected between the second comb-shaped electrode and the counter electrode as a delayed electric signal.
    Type: Grant
    Filed: May 20, 2002
    Date of Patent: November 4, 2003
    Inventor: Kohji Toda
  • Patent number: 6407650
    Abstract: A system (200) for transmitting and focusing surface acoustic waves (208) along a substrate (206) is disclosed. The system (200) comprising a curved transmission element (202) that is disposed upon the substrate (206). The curved transmission element (202) is adapted to propagate an acoustic wave (212). The system (200) also comprises a curved receiving element (206) that is disposed upon the substrate in relation to the curved transmission element (202). The curved receiving element (206) is adapted to receive the acoustic wave (212) and match the acoustic wave's size and shape.
    Type: Grant
    Filed: August 27, 1999
    Date of Patent: June 18, 2002
    Assignee: Board of Regents The University of Texas System
    Inventor: Duncan L. MacFarlane
  • Patent number: 6391675
    Abstract: A switch includes a conductive region, a membrane, and a dielectric region. The dielectric region is formed from a dielectric material and is disposed between the membrane and the conductive region. When a sufficient voltage is applied between the conductive region and the membrane, a capacitive coupling between the membrane and the conductive region is effected. The dielectric material has a resistivity sufficiently low to inhibit charge accumulation in the dielectric region during operation of the switch.
    Type: Grant
    Filed: September 13, 1999
    Date of Patent: May 21, 2002
    Assignee: Raytheon Company
    Inventors: John C. Ehmke, Charles L. Goldsmith, Zhimin J. Yao, Susan M. Eshelman
  • Patent number: 6320479
    Abstract: In accordance with the invention, magnetostrictive saw devices are provided with improved transducer structures for enhanced performance. In one improved device, the transducers are in the form of gratings with interconnected ends for reduced resistance and inductance. In another embodiment, the transducers are shaped to provide apodization. In yet a third embodiment, transducer performance is enhanced by patterning composite structures.
    Type: Grant
    Filed: December 17, 1999
    Date of Patent: November 20, 2001
    Assignee: Agere Systems Optoelectronics Guardian Corp.
    Inventors: Glenn B. Alers, Kenneth Alexander Ellis, Timothy J. Klemmer, Robert Bruce Van Dover
  • Patent number: 6275123
    Abstract: A surface acoustic wave matched filter for use in a spread spectrum communication system is disclosed. The surface acoustic wave matched filter includes a substrate having dispersity and is composed of a sapphire main body and a piezoelectric aluminum nitride. A tap distance L of an output side electrode is designed on the basis of a group velocity vg instead of a phase velocity vs in order to match the tap distance L with an input spread spectrum signal and to improve a correlation peak level of an output demodulated signal. When the tap distance L is set to satisfy a condition of vg/f1×0.97≦L≦vg/f1×1.02, a decrease in the correlation peak level of the matched filter can be improved from 7 dB to a value smaller than 3 dB, and S/N of the output demodulated signal can be increased. Thus, the disclosed device renders it no longer necessary to process the output demodulated signal by a complicated and power consuming circuit.
    Type: Grant
    Filed: July 12, 1999
    Date of Patent: August 14, 2001
    Assignee: NGK Insulators, Ltd.
    Inventors: Mitsuhiro Tanaka, Tomohiko Shibata, Yuji Hori
  • Patent number: 6229409
    Abstract: An output side electrode of a surface acoustic wave matched filter with portions having different delay times between taps. The output side electrode may be provided by arranging parallelly a plurality of output side electrodes having different scales, different tap distances, or by forming output side electrodes in an inclined fashion or in a dog-leg shape viewed in a direction of an aperture length, or by arranging, between electrode fingers, thin films having different dimensions or thicknesses viewed in the direction of the aperture length, or by forming, between electrode fingers, recessed portions having different dimension or depth viewed in the direction of the aperture length.
    Type: Grant
    Filed: March 18, 1999
    Date of Patent: May 8, 2001
    Inventors: Kazuo Tsubouchi, Michio Yokoyama, Shuichi Tomabechi, Takumi Suetsugu, Yuichiro Imanishi, Tomohiko Shibata
  • Patent number: 6075898
    Abstract: A reflective array compressor for a fast pattern recognition system. The system includes a combination of digital and analog processing circuitry which allows the system to achieve super computing processing speeds within an open personal computer architecture. The system receives a bit map which is representative of the unknown pattern, such as a picture of an unknown person. The bit map could have multiple people in it--no other system has "faces in the crowd" ability. The bit map associated with the unknown pattern is then pre-processed and compared against a plurality of known patterns in a database to determine how well the unknown pattern correlates with the known patterns. The reflective array compressor employs concave input and output transducers, and curved reflectors.
    Type: Grant
    Filed: August 6, 1998
    Date of Patent: June 13, 2000
    Assignee: FPR Corporation
    Inventor: Walter E. Chase
  • Patent number: 6072377
    Abstract: A surface acoustic wave device includes a piezoelectric substrate, and comb-shaped electrodes each having a bus bar and a plurality of electrode fingers disposed on the piezoelectric substrate. At least one of the fingers and the bus bar are connected to each other via at least two different connecting portions at two different locations.
    Type: Grant
    Filed: February 1, 1999
    Date of Patent: June 6, 2000
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Toshiyuki Tajima, Kunio Minami, Kenji Sakaguchi
  • Patent number: 6011344
    Abstract: The transducer according to the invention, driven in differential mode, consists of at least a first transducer (5) and a second transducer (6) which are connected in parallel so as to obtain the symmetry of the differential inputs, respectively forming a first and a second acoustic channel; the two transducers (5, 6) exhibiting a specified longitudinal offset with respect to one another. Applications: mobile radio filters.
    Type: Grant
    Filed: June 4, 1998
    Date of Patent: January 4, 2000
    Assignee: Thomson-CSF
    Inventors: Pierre Dufilie, Marc Solal
  • Patent number: 5925967
    Abstract: An ultrasonic switching device comprises a piezoelectric substrate, and an input- and an output interdigital transducers formed on an upper end surface of the piezoelectric substrate. The output interdigital transducer has a finger-overlap zone R.sub.i (i=1), or has N finger-overlap zones R.sub.i (i=1, 2, . . . , N) and N-1 finger-overlap zones Q.sub.i {i=1, 2, . . . , (N-1)} between two finger-overlap zones R.sub.i and R.sub.(i+1). Each finger-overlap zone R.sub.i comprises zones R.sub.ia, R.sub.ib and R.sub.im. The finger direction of the zones R.sub.ia and R.sub.ib runs parallel with that of the input interdigital transducer. The finger direction of the zone R.sub.im is slanting to that of the input interdigital transducer by an angle .alpha.. The finger direction of the finger-overlap zone Q.sub.i is slanting to that of the input interdigital transducer by an angle .+-..beta..
    Type: Grant
    Filed: February 13, 1998
    Date of Patent: July 20, 1999
    Inventor: Kohji Toda
  • 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: 5872520
    Abstract: An identification and/or sensor system includes a sensor that queries an identification and/or sensor configuration which contains resonators. A receiver receives an answer signal from the identification and/or sensor configuration. The receiver includes a phase-locked loop for converting a resonator decay signal into a signal of constant frequency and constant envelope curve.
    Type: Grant
    Filed: October 24, 1996
    Date of Patent: February 16, 1999
    Assignee: Siemens Aktiengesellschaft
    Inventors: Franz Seifert, Alfred Pohl, Gerald Ostermayer
  • Patent number: 5841214
    Abstract: An identification mark operating with acoustical surface waves includes at least one reflector having higher reflectivity than a reflectivity of other reflectors.
    Type: Grant
    Filed: August 22, 1996
    Date of Patent: November 24, 1998
    Assignee: Siemens Aktiengesellschaft
    Inventors: Frank Schmidt, Valentin Magori, Leonhard Reindl, Thomas Ostertag
  • Patent number: 5793146
    Abstract: An improved surface acoustic wave device that utilizes M electrodes per each N transduction length(s) of a transducer that produces a desired net internal distributed reflectivity in both magnitude and phase. Two of the transducers can be made placed on a single substrate and be unidirectional and caused to radiate towards each other to form a filter. A resonator, a delay line, or the like can also be formed.
    Type: Grant
    Filed: April 20, 1995
    Date of Patent: August 11, 1998
    Assignee: RF Monolithics, Inc.
    Inventor: Peter V. Wright
  • Patent number: 5703427
    Abstract: The distributed acoustic reflection transducer has a reflection function which includes at least one reversal of sign, that is to say it possesses at least one reflector and, in general, a combination of reflectors, the center of which is at a distance of k.lambda./2+.lambda./4 from the center of the other reflectors, .lambda. being the wavelength corresponding to the central operating frequency of the transducer.The applications will be for the production of surface-wave filters in radio communication systems.
    Type: Grant
    Filed: October 15, 1996
    Date of Patent: December 30, 1997
    Assignee: Thomson-CSF
    Inventors: Marc Solal, Pascal Ventura, Jean-Michel Hode
  • Patent number: 5691698
    Abstract: An identification and/or sensor system includes an identification and/or sensor configuration having resonators for determining at least one parameter to be interrogated. The resonators have a quality being good enough to effect a storage of energy in the resonators. A transmitting and receiving apparatus transmits interrogation signals by radio to the identification and/or sensor configuration and receives and evaluates reply signals transmitted back from the identification and/or sensor configuration. The transmitting and receiving apparatus is a broadband device.
    Type: Grant
    Filed: April 17, 1995
    Date of Patent: November 25, 1997
    Assignee: Siemens Aktiengesellschaft
    Inventors: Gerd Scholl, Leonhard Reindl, Werner Ruile, Thomas Ostertag
  • Patent number: 5644598
    Abstract: A switching arrangement is provided for coupling a transmitting unit to a transmission line. According to the present invention, a transformer is provided, whose secondary winding is a portion of the transmission line and whose primary winding is connected with the transmitting unit and integrated into a parallel resonance circuit, whose resonant frequency is tuned, each time, to the carrier frequency of the transmitted signal. In addition, a tuning unit may be provided for the automatic tuning of the parallel resonance circuit.
    Type: Grant
    Filed: January 11, 1994
    Date of Patent: July 1, 1997
    Assignee: Siemens Schweiz AG
    Inventor: Werner Bidese
  • Patent number: 5550793
    Abstract: The invention concerns unidirectional ground-wave transducers using an alternating series of emitter cells (E) and reflector cells (R).The invention consists in using, in the emitter cells (E), fingers having a width of .lambda./3 spaced apart by a distance of 2 .lambda./3; and, in the reflector cells (R), fingers having a width of .lambda./4 spaced apart by a distance of .lambda./2.Using identical engraving precision, the invention makes it possible to increase by 50% the frequency at which the unidirectional transducer thus produced can be used.
    Type: Grant
    Filed: April 26, 1995
    Date of Patent: August 27, 1996
    Assignee: Thomson-CSF
    Inventor: Pierre Dufilie
  • Patent number: 5485051
    Abstract: To obtain a surface acoustic wave device which can be produced with ease at a low cost and can be reduced in size without causing deterioration of characteristics, a surface acoustic wave device having input and output transducers arranged alternately on the surface of a substrate for propagating a surface acoustic wave includes metal patterns provided outside the transducers along the extension line of the propagation path of the surface acoustic wave and having at least one surface inclined at an angle .theta.(5.degree.<.theta.<85.degree. or -85.degree.<.theta.<-5.degree.) with respect to the propagation direction of the surface acoustic wave.
    Type: Grant
    Filed: May 12, 1994
    Date of Patent: January 16, 1996
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshiko Tera, Kouji Morishima, Atsushi Sakai
  • 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: 5319326
    Abstract: A surface-wave-type reflective delay line includes an input/output interdigital converter, and a plurality of surface wave reflectors. The surface wave reflectors are disposed at positions corresponding to an order of magnitude of half of a particular desired transit time of a surface wave between the input/output interdigital converter and an applicable surface wave reflector and back. At least some of the surface wave reflectors are each shifted by a mathematically random value out of the positions corresponding to half the particular desired transit time.
    Type: Grant
    Filed: April 8, 1992
    Date of Patent: June 7, 1994
    Assignee: Siemens Matsushita Comp. GmbH & Co KG
    Inventors: Bernd Fleischmann, Peter Zibis
  • 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: 5294859
    Abstract: A surface acoustic wave filter device includes a substrate which comprises quartz or the like piezoelectric having a small temperature coefficient and which is formed with unidirectional transducers of asymmetrical construction. A floating electrode is spaced from intermediate position between adjacent positive and negative electrodes which are arranged in interdigital manner, to effectively utilize a mechanical reflection caused by the floating electrode. In consideration of the sign and magnitude of the reflection factor of the floating electrodes, short-circuited electrodes only are used for the floating electrodes. The surface acoustic wave filter device has improved temperature characteristic, insertion loss characteristic and phase characteristic.
    Type: Grant
    Filed: March 26, 1993
    Date of Patent: March 15, 1994
    Assignees: Kazuhiko Yamanouchi, NGK Insulators, Ltd.
    Inventors: Kazuhiko Yamanouchi, Mitsuhiro Tanaka, Masahiko Sugiyama, Yasufumi Horio, Masatsugu Oshima, Kenji Suzuki
  • Patent number: 5264751
    Abstract: In a transducer for surface waves, an alternating succession of transmitter cells and reflector cells is used. The transmitter cells transmit surface waves in phase opposition, leftwards and rightwards. The reflector cells have a reflection coefficient that is in phase opposition between the left-hand side and the right-hand side. The waves transmitted by the transmitter cells interfere with the waves reflected by the reflector cells, destructively in one direction and constructively in the other direction. This enables the making of transducers with spacings equal to .lambda./4 and .lambda./6 only.
    Type: Grant
    Filed: September 30, 1992
    Date of Patent: November 23, 1993
    Assignee: Thomson-CSF
    Inventors: Pierre Dufilie, Jean Desbois
  • Patent number: 5260913
    Abstract: A surface acoustic wave device which is a surface acoustic wave resonator utilizing an SH-type surface wave, wherein a resin layer made of a resin material in the form of gel or having a Shore hardness of not more than 30 is formed so as to coat at least an interdigital transducer formed on the upper surface of a piezoelectric substrate.
    Type: Grant
    Filed: January 10, 1992
    Date of Patent: November 9, 1993
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Michio Kadota, Kazuhiko Morozumi
  • Patent number: 5243556
    Abstract: A sampling device operating as a buffer between a first data signal and a relatively slow processing device accepts the input signal and stores samples of it on a SAW traveling past an input electrode. A blocking potential is applied to a set of electrodes to store a set of charge packets with the SAW device. Packets are consecutively released at a slower rate accommodated to the needs of the next processing unit in line, to read out the sampled signal at a modified rate for intentional distortion of the input signal, for slowing the output stored signal rate, or for time reversal of the signal.
    Type: Grant
    Filed: February 22, 1991
    Date of Patent: September 7, 1993
    Assignee: United Technologies Corporation
    Inventor: Thomas W. Grudkowski
  • Patent number: 5241209
    Abstract: A semiconductor device having a semiconductor substrate or an insulation layer, an integrated circuit on each of the opposite sides, or main surfaces, of the semiconductor substrate or insulation layer, and a path for an ultrasound signal interconnecting the integrated circuits. The path is afforded by an ultrasonic transducer on each of the opposite sides of the semiconductor substrate or insulation layer. A plurality of paths may be provided in the same semiconductor substrate or insulation layer without crosstalk by transmitting ultrasound signals having different frequencies through the respective paths. The paths may be one-way or two-way. The ultrasonic transducers each contain a piezoelectric material; the thickness of the piezoelectric material in the ultrasonic transducer, at least on the receiver side in each path, is such that the resonant frequency of the ultrasonic transducer corresponds to the frequency of the ultrasound signal signal transmitted through the path.
    Type: Grant
    Filed: July 24, 1991
    Date of Patent: August 31, 1993
    Assignee: Fujitsu Limited
    Inventor: Nobuo Sasaki
  • Patent number: RE35204
    Abstract: An acoustic wave device employing surfaces skimming bulk waves comprises a piezo electric substrate having a flat surface which carries an input transducer and an output transducer for respectively lanuching and receiving acoustic waves into and from the bulk of the substrate. The substrate may be of quartz, lithium tantalate, or lithium niobate and has the flat surface orientated so that a surface skimming bulk wave is launched without generation of surface acoustic waves.
    Type: Grant
    Filed: March 29, 1995
    Date of Patent: April 9, 1996
    Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
    Inventor: Meirion F. Lewis