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| Number | Title | Issue Date |
| 8138856 | High-frequency acoustic wave device 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. ... | 03/20/2012 |
| 7889025 | Anti-reflective acoustic diffuser for SAW and BAW devices 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 irregul... | 02/15/2011 |
| 7880563 | High-frequency acoustic wave device 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. ... | 02/01/2011 |
| 7372897 | Portable information communication terminal, program, and recording medium 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 t... | 05/13/2008 |
| 7372347 | Surface acoustic wave device A surface acoustic wave (SAW) device includes a piezoelectric substrate, a first and a second interdigital transducers (IDT) provided thereon. The second IDT has a side that is substantially aligned with a corresponding side of the first IDT, and another side of the... | 05/13/2008 |
| 7362033 | Surface-acoustic-wave device A surface-acoustic-wave device includes a piezoelectric substrate and first and second comb-shaped electrodes each having a bus-bar portion parallel to a propagation direction of a surface acoustic wave in the substrate. Respective electrode fingers are periodically... | 04/22/2008 |
| 7352104 | Surface acoustic wave element, method of manufacturing the same and surface acoustic wave device A surface acoustic wave element is provided including an IDT and reflectors provided on both sides of the IDT that are on a surface of a quartz plate. The quartz plate is made from an in-plane rotated ST cut quartz plate whose cutting angle is expressed as (0°, 113... | 04/01/2008 |
| 7352800 | Method of partial parallel interference cancellation 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 fr... | 04/01/2008 |
| 7323802 | Surface acoustic wave device A surface acoustic wave device that can operate in alternate-phase mode and single-phase mode, and thus generate surface acoustic waves at two different frequencies. The device is based on a piezoelectric film deposited on an elastic substrate, and includes an elect... | 01/29/2008 |
| 7262542 | Ultrasound radiation device into a material When input electric signals Ei (i=1, 2, . . . , n) with frequencies fi (i=1, 2, . . . , n), respectively, are applied to an input interdigital transducer, elastic waves are excited in a piezoelectric substrate. Leaky components of the elastic w... | 08/28/2007 |
| 7205707 | Laser machining of electroactive ceramics Laser beam machining is applied to form arbitrarily shaped electroactive ceramics for transducers (e.g., electromechanical sensors and actuators). One particularly preferred embodiment of the invention comprises machining parallel grooves in a ceramic plate to impro... | 04/17/2007 |
| 7180388 | Surface acoustic wave device 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 su... | 02/20/2007 |
| 7148769 | Surface acoustic wave device and process for fabricating the same A surface acoustic wave device has a piezoelectric substrate 1, and a comb transducer 2 formed on a surface of the piezoelectric substrate 1. Grooves 5 for eliminating an unnecessary wave are formed in a back surface of the surface acoust... | 12/12/2006 |
| 7132778 | Surface acoustic wave modulator An acoustic wave identification transponder device, having a substrate, an electroacoustic transfer generating an acoustic wave in said substrate and a set of encoding elements disposed in a path of the acoustic wave for modifying the acoustic wave, having elements ... | 11/07/2006 |
| 7103949 | Method for fabricating a transducer A method for fabricating a transducer suitable for a fluidic drive for a miniature acoustic-fluidic pump or mixer that includes an acoustic transducer attached to an exterior or interior of a fluidic circuit or reservoir. The transducer converts radio frequency elec... | 09/12/2006 |
| 7102381 | Adaptive termination for optimum signal detection 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 ... | 09/05/2006 |
| 7046102 | Surface acoustic wave filter, balanced type circuit, and communication apparatus A surface acoustic wave filter including a piezoelectric substrate, IDT electrodes which are formed on the piezoelectric substrate and are connected to balanced type terminals. Further, IDT electrodes are formed on the piezoelectric substrate and are connected to an... | 05/16/2006 |
| 7042132 | Transducer structure that operates with acoustic waves For improved conformance of a filter operating with acoustic waves, a transducer structure is provided in which the separations between respectively two adjacent electrode fingers of an inter-digital transducer (IDTv) vary over the length of the transduce... | 05/09/2006 |
| 6967545 | Saw wave-guides 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 oth... | 11/22/2005 |
| 6950009 | Dual mode transmitter/receiver and decoder for RF transponder units An enhanced backscatter RF-ID tag reader system and multiprotocol RF tag reader system is provided. In a multiprotocol mode, the system emits a non-stationary interrogation signal, and decodes a phase modulated backscatter signal by detecting a stronger phase compon... | 09/27/2005 |
| 6515554 | High-frequency circuit device and communication apparatus 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 ... | 02/04/2003 |
| 6323740 | High-frequency circuit device and communication apparatus 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 ... | 11/27/2001 |
| 6057630 | Surface acoustic wave device 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.... | 05/02/2000 |
| 5905449 | Radio switching apparatus 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 devic... | 05/18/1999 |
| 5475348 | Surface wave filter filtering delay transfer function It consists of several channels (V1, V2) in parallel, which exhibit an inter-transducer gap difference (21 -41 ; 22 -42) equal to an even multiple of the half-wavelength (λ) at the central frequency, from one c... | 12/12/1995 |
| 5414321 | Surface-wave arrangement having a structure for preventing interfering acoustic wave components 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, ... | 05/09/1995 |
| 5387833 | Method and device for separating acoustic wave-generated energy from directly coupled electromagnetic interference 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 require... | 02/07/1995 |
| 5367216 | Surface acoustic wave element and communication system using the same 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 ... | 11/22/1994 |
| 5349260 | Two track surface wave arrangement with improved selection property 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 ... | 09/20/1994 |
| 5306978 | Surface acoustic wave unidirectional transducer having floating electrodes 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... | 04/26/1994 |
| 5173667 | Acoustic wave transmission media delay line having internally disposed absorber channels 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 th... | 12/22/1992 |
| 5162689 | Single-phase uni-directional acoustic wave transducer 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 substr... | 11/10/1992 |
| 5153476 | Acoustic vibrator with variable sensitivity to external acceleration 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 signal... | 10/06/1992 |
| 5126706 | Surface wave arrangement with conversion structure for preventing undesirable reflected waves 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.... | 06/30/1992 |
| 5111167 | Surface acoustic wave device and method utilizing plural multi-strip couplers 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 configuratio... | 05/05/1992 |
| 4999535 | Saw transducer with improved bus-bar design 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 f... | 03/12/1991 |
| 4993000 | Surface acoustic wave device 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 po... | 02/12/1991 |
| 4960329 | Chirp pulse echo ranging apparatus 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 t... | 10/02/1990 |
| 4945354 | Spurious signal correction for surface acoustic wave (SAW) security devices 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 devi... | 07/31/1990 |
| 4933588 | Higher order transverse mode suppression in surface acoustic wave resonators 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 surfac... | 06/12/1990 |
