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| Number | Title | Issue Date |
| 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 |
| 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 |
| 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 |
| 7157991 | Surface acoustic wave device having reflectors with both open and shorted electrodes A surface acoustic wave device for implementing an attenuation characteristic outside of the pass band and the narrow band characteristics, preferably for use as a filter. The surface acoustic wave device includes a piezoelectric substrate, interdigital transducers ... | 01/02/2007 |
| 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 |
| 7053524 | Surface acoustic wave sensor or identification device with biosensing capability 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 acoust... | 05/30/2006 |
| 6967428 | Selectable reflector arrays for SAW sensors and identification devices 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 su... | 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 |
| 6856214 | Surface wave devices with low passband ripple 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 quarte... | 02/15/2005 |
| 6815867 | Substrate usable for an acoustic surface wave device, a method for fabricating the same substrate and an acoustic surface wave device having the same substrate 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 Al... | 11/09/2004 |
| 6683515 | Surface-acoustic-wave filter providing outputs with different delay times and communications unit A surface-acoustic-wave filter has a piezoelectric substrate; and a plurality of transversal surface-acoustic-wave (SAW) filters set on the piezoelectric substrate and respectively having at least two inter-digital transducer (IDT) electrodes for transcie... | 01/27/2004 |
| 6559736 | Integrated tunable surface acoustic wave with quantum well structure technology and systems provided thereby A ZnO monolithically integrated tunable surface acoustic wave (MITSAW) device uses tunable acousto-electric and acouso-optic interaction between surface acoustic waves (SAW) and a two dimensional electron gas (2DEG) in a ZnO/Mgx Zn1-x | 05/06/2003 |
| 6545567 | Programmable analog tapped delay line filter having cascaded differential delay cells Method and system for a programmable analog tapped delay line filter are disclosed. One embodiment of the present invention is a programmable analog tapped delay line filter comprising an input line, an output line, and one or more gaincells or taps coupl... | 04/08/2003 |
| 6229409 | Surface acoustic wave matched filter 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, di... | 05/08/2001 |
| 6208062 | Surface acoustic wave transponder configuration An acoustic wave identification transponder device, having a substrate, an electroacoustic transducer 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, hav... | 03/27/2001 |
| 6075898 | Reflective array compressor 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 archite... | 06/13/2000 |
| 6025762 | Delay line incorporating a surface acoustic wave ladder filter and method of providing same A method (100) of providing a time delay to a signal utilizing a surface acoustic wave ladder filter includes a first step (102) of providing a piezoelectric substrate. A second step (104) includes disposing series and shunt coupled surface acoustic wave ... | 02/15/2000 |
| 5841214 | Identification mark operating with acoustic surface waves An identification mark operating with acoustical surface waves includes at least one reflector having higher reflectivity than a reflectivity of other reflectors.... | 11/24/1998 |
| 5691698 | Identification and/or sensor system 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... | 11/25/1997 |
| 5530410 | Acoustic frequency mixing devices using potassium titanyl phosphate and its analogs Acoustic frequency mixing devices for controlling high frequency signals by the generation of acoustic waves are disclosed. The devices include (a) a crystalline substrate of MTiOXO4 (wherein M is K, Rb, Tl and/or NH4 and X is P and/... | 06/25/1996 |
| 5519365 | Waveguide for an acoustic charge transport device A waveguide for surface acoustic waves comprises a substrate for supporting propagation of surface acoustic waves along a direction at a substrate velocity and a dielectric structure disposed above the substrate along the propagation direction of the surf... | 05/21/1996 |
| 5396199 | Surface acoustic wave device 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 ... | 03/07/1995 |
| 5353304 | Surface acoustic wave device, and demodulating apparatus and communication system using the surface acoustic wave device In a surface acoustic wave device, there are arranged a piezoelectric substrate, an input electrode and an output electrode. The input electrode is formed on the substrate, and generates a surface acoustic wave propagated in a predetermined direction, in ... | 10/04/1994 |
| 5319326 | Surface-wave-type reflective delay line 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 des... | 06/07/1994 |
| 5274345 | Dual function reflector structures for interdigital saw transducer A SAW reflector structure located between multiple interdigitated generator/receivers located on a piezo-electric substrate forming a ladder type SAW device is described. The reflector structure reduces both reflections due to mechanical-electrical loadin... | 12/28/1993 |
| 5189393 | Dual technology motion sensor A dual technology sensor which uses both ultrasonic and infrared sensors is disclosed. The electronic circuit of the invention requires detection by both sensors to activate the load. Thus, false triggering will not occur unless the false triggering devic... | 02/23/1993 |
| 5189330 | Surface acoustic wave device An SAW convolver is disclosed, in which a pair of input transducer means disposed at the left and right end portions on a piezoelectric substrate having a velocity dispersion consists of a plurality of pairs of input transducers and the distance between d... | 02/23/1993 |
| 5179309 | Surface acoustic wave chirp filter A surface acoustic wave (SAW) chirp signal processor having a piezoelectric substrate, an array of input transducers and an array of output transducers. In its chirp compression mode, the device has chirp signals applied in parallel to its input transduce... | 01/12/1993 |
| 5138215 | Saw reflective array correlator with amplitude error compensating polymer reflective array grating Amplitude error compensation is provided for a surface acoustic wave (SAW) reflective array correlator (RAC) device having a first reflective array grating fed by an input interdigital transducer and a second reflective array grating which feeds the refle... | 08/11/1992 |
| 5130597 | Amplitude error compensated saw reflective array correlator An amplitude error compensated surface acoustic wave reflective array corator is provided having an input interdigital transducer feeding a first slanted reflective array grating, a second slanted reflective array grating feeding an output transducer and... | 07/14/1992 |
| 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 |
| 5113115 | Saw slanted array correlator with amplitude error compensating polymer reflective array grating Amplitude error compensation is provided for a surface acoustic wave (SAW) lanted array correlator (SAC) device having an input interdigital dispersive slanted array transducer feeding a plurality of frequency dispersed SAW signals to an output interdigita... | 05/12/1992 |
| 5111168 | Real-time, in-situ saw filter delay adjustment A method of adjusting the center frequency of a SAW device by providing a substrate capable of propagating a surface acoustic wave thereon having input transducer electrode on one end portion thereof, output transducer electrodes on the opposite end porti... | 05/05/1992 |
| 5084687 | Surface acoustic wave encoder/decoder A unitary surface acoustic wave device for continuous quadraphase coding of a high amplitude video impulse with provisions for controlling the rise and fall times of such impulse.... | 01/28/1992 |
| 5043620 | Surface acoustic wave convolver and convolution integrator using same In an SAW convolver composed of a substrate having a multi-layered structure comprising at least a piezoelectric film, self convolution is suppressed by disposing a first and a second array electrode disposed between the gate electrode and a pair of input... | 08/27/1991 |
| 5010270 | Saw device Techniques for adjusting the surface acoustic wave velocity of a packaged SAW device are described. A first technique involves depositing a film from a cover of the device onto a surface wave propagating surface thereby providing a localized region on sai... | 04/23/1991 |
| 4973875 | Surface elastic wave device A surface elastic wave filter for processing a supplied signal into a signal with nonlinear-phase frequency characteristics has a piezoelectric substrate for propagating a surface elastic wave through a surface layer thereof and spaced input and output el... | 11/27/1990 |
| 4965479 | Surface transverse wave resonator A surface transverse wave resonator comprises a piezoelectric substrate having at least one surface, wherein said substrate includes a crystalline structure that permits the propagation of transverse waves. The resonator also comprises a transducing set o... | 10/23/1990 |
| 4952833 | High density surface acoustic waveguide channelizer A surface acoustic wave device is disclosed which performs frequency channelization in a relatively small volume. The invention utilizes a wide band incline step frequency transducer each step feeding an independent beam width compressor waveguide combina... | 08/28/1990 |
| 4943751 | Surface acoustic wave element In a surface acoustic wave element comprising a semiconductor substrate, a piezoelectric layer formed thereon and at least one interdigital electrode disposed on the surface thereof, a semiconductor region having a conductivity type different from that of... | 07/24/1990 |
