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Topic: Surface Acoustic Wave

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	United States Patent Application: 0040103509 (Site not responding. Last check: 2007-09-17)
		Surface acoustic wave component according to one of the claims 1 or 2, characterized in that the package has a second layer, called an adhesive layer, located between the first layer and the printed circuit.
		Surface acoustic wave component according to one of the claims 1 to 3, characterized in that the external face of the substrate and the side faces of the component are covered with a third layer that is hermetic.
		Surface acoustic wave component according to one of the claims 1 to 4, characterized in that the printed circuit is metallized on the surface.
	appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&s1="20040103509".PGNR.&OS=DN/20040103509&RS=DN/20040103509 (2447 words)

	Surface acoustic wave - Wikipedia, the free encyclopedia
		A surface acoustic wave (SAW) is a kind of wave used in piezoelectric devices called SAW devices in electronics circuits.
		SAW devices are employed in as filters, oscillators and transformers based on the transduction of acoustic waves.
		SAW filters have enjoyed successful application in the booming cellular telephones market and provide significant advantages in performance, cost, and size over other filter technologies (DSPs, Quartz Crystals (bulk wave), LC-filters, and waveguide filters).
	en.wikipedia.org /wiki/Surface_acoustic_wave (188 words)

	Surface acoustic wave devices comprising large-grained diamonds and methods for making - US Patent 6222299 (Site not responding. Last check: 2007-09-17)
		SAW devices having frequency-selective elements are used as acoustic filters, with the sound radiation of certain frequencies being transmitted through the pass-band structure while other frequencies are attenuated.
		SAW filters typically are of a resonator type or a transversal type, depending on the device structure and the mode of operation.
		The invention is embodied in a surface acoustic wave (SAW) device having large-grained diamond in combination with a piezoelectric layer to enhance the acoustic velocity and operational frequency of the SAW device by reducing loss and improving efficiency.
	www.patentstorm.us /patents/6222299.html (3624 words)

	Multichannel surface acoustic wave encoder/decoder - Patent 4764701
		Thus, if the SAW channels are to have closely matching output impedances, their respective output transducers must all have the same aperture width, whereas the aperture widths of the output transducers must be different if the SAW channels are to have specified different insertion losses.
		Both waves launched by transducer 14 have the width of the aperture a.sub.M of the uniform transducer, and propagate away from it as shown by the arrows 26 and 28.
		Similarly, subaperture 52-54 corresponds to Channel B because it is acoustically coupled to output transducer 17', subaperture 54-56 corresponds to Channel C because it is acoustically coupled to output transducer 18', and subaperture 56-58 corresponds to Channel D because it is acoustically coupled to output transducer 19'.
	www.freepatentsonline.com /4764701.html (4500 words)

	Sensors Magazine Online - October 2000 -Acoustic Wave Technology Sensors (Site not responding. Last check: 2007-09-17)
		Acoustic waves are distinguished primarily by their velocities and displacement directions; many combinations are possible, depending on the material and boundary conditions.
		Surface wave velocities are temperature dependent and are determined by the orientation and type of crystalline material used to fabricate the sensor.
		Surface acoustic wave sensors have proved to be the most sensitive in general as a result of their larger energy density on the surface.
	www.sensorsmag.com /articles/1000/68/main.shtml (4419 words)

	Surface acoustic wave device - Patent 4683395
		A monolithic surface acoustic wave convolver has a structure of piezoelectric layer/insulative layer/p(n)-type semiconductive layer/n(p)-type semiconductive layer/n.sup.+ (p.sup.+)-type semiconductive substrate in which the p(n)-type semiconductive layer has a uniform thickness, and its acceptor (donor) concentration and thickness are selected to allow a depletion layer to expand throughout it under zero bias.
		A surface acoustic wave device of claim 1 wherein said substrate is an n.sup.+ -type semiconductor, said first conductivity semiconductive layer is an n-type semiconductive epitaxial layer, and said second conductivity semiconductive layer is the surface of said epitaxial layer changed to a p-type semiconductive layer.
		A surface acoustic wave device of claim 2 wherein said substrate is a p.sup.+ -type semiconductor, said first conductivity semiconductive layer is a p-type semiconductive epitaxial layer, and said second conductivity semiconductive layer is the surface of said epitaxial layer changed to an n-type semiconductive layer.
	www.freepatentsonline.com /4683395.html (1232 words)

	Magnetically tuned, surface acoustic wave device - Patent 4078186
		SAW devices intrinsically have a fixed delay the amount of which is determined by material constraints and the physical separation between input and output terminals.
		A SAW device comprising a piezoelectric crystal substrate 10 is formed with interdigital transducer input and output means 14 and 15 on one surface.
		The SAW device would normally be operated on the descending portion of the H.sub.z curve with a bias field varying from 0 to approximately 1 Kgauss.
	www.freepatentsonline.com /4078186.html (1656 words)

	Supriyo Datta: Surface Acoustic Wave Devices
		Surface acoustic wave devices are becoming increasingly popular in signal processors in the VHF/UHF range, because of their size and simplicity.
		However, it is extremely difficult for a beginner with a background in signal processing to understand the operation of SAW devices because of a lack of acquaintance with acoustics.
		In Chapter 3 we discuss the surface acoustic wave, which is a nonuniform wave with complicated acoustic and piezoelectric fields coupled together.
	dynamo.ecn.purdue.edu /~datta/saw_book.htm (643 words)

	Surface Acoustic Wave (SAW) Device Applications
		SAW correlators enable the passive reception and trans- mission of complex coded signals.
		SAW filters have been developed for passive remote sensing applications, where the sensor has no local power source available.
		SAW filters enable the passive reception and transmission of complex coded signals.
	www.sandia.gov /mstc/products/usystemsprod/rfandoptosystems/saw.html (285 words)

	Surface Acoustic Wave
		The SAW touchscreen is a glass overlay with transmitting and receiving piezoelectric transducers for both the X and Y axes.
		These mechanical waves are directed across the opposite side gather and direct the waves to the receiving transducer, which reconverts them into an electrical signal.
		When the front surface of the touchscreen is touched, a portion of the mechanical wave is absorbed, thus changing the received signal.
	www.pixeltouch.com /saw.html (317 words)

	touch screen technologies - Resistive, Capactive, and Surface Acoustic Wave touchscreens
		Surface Acoustic Wave technology uses ultrasonic waves that pass over the touch screen panel.
		When a finger touches the screen, the waves are absorbed (or broken), causing a touch command to be detected at that specific point.
		Surface wave touch screen panels are the most advanced of the three types, but they can be damaged by outside elements.
	www.caltronind.com /touch_screen_signage_options/touchscreen_technologies.html (651 words)

	Amazon.com: Surface Acoustic Wave Devices for Mobile and Wireless Communications (Applications of Modern Acoustics): ... (Site not responding. Last check: 2007-09-17)
		Surface Acoustic Wave Devices for Mobile and Wireless Communications serves as an excellent sourcebook for engineers and designers with some SAW background, or for technical staff with no prior knowledge of SAW devices who need to know how this technology can help their products.
		Electronic signal processing by means of the selective manipulation of surface acoustic waves on piezoelectric substrates was initiated in 1965 with the invention of the thin-film interdigital transducer (IDT) by White and Voltmer at the University of California, at Berkeley [1].
		Acoustic surface waves (Topics in applied physics ; v.
	www.amazon.com /exec/obidos/tg/detail/-/0121573400?v=glance (919 words)

	Amazon.com: Surface-Launched Acoustic Wave Sensors: Chemical Sensing and Thin-Film Characterization: Books (Site not responding. Last check: 2007-09-17)
		With respect to chemical applications, surface-launched acoustic wave sensors were originally developed as sensing devices for specific chemical and biological species, but more recently have been applied to the study of thin film and interfacial properties.
		Subsequent chapters explore acoustic waves in solids and device structure, theory of acoustic wave response, and the various categories of acoustic wave device.
		The clear emphasis of the text is the study of chemical and/or biochemical systems imposed on the surface of such devices, whether operated in the gas or liquid phase, i.e., on acoustic wave chemical and biological sensors.
	www.amazon.com /exec/obidos/tg/detail/-/0471127949?v=glance (1144 words)

	Surface acoustic wave pickup and recording device (US4281407)
		A surface acoustic wave (SAW) pickup and record stylus is constructed from an elongated substrate which supports the propagation of SAW.
		During operation in the pickup mode a beam of SAW is focused to the tip of the stylus which is arranged in contact with a record medium.
		During playback, the beam reflected by the record medium generates a signal in the interdigital electrode of the stylus representative of the acoustic conditions at the stylus tip and, correspondingly, of the information recorded on the record medium surface.
	www.delphion.com /details?pn=US04281407__ (420 words)

	CAMEX-3 JPL Surface Acoustic Wave (SAW) Hygrometer
		The SAW hygrometer measures dewpoint by establishing equilibrium between evaporation and condensation on the surface of the SAW device.
		Using a SAW device as a fast, high-sensitivity moisture sensor, a feedback controller measures the condensation on the sensor surface, and responds by heating or cooling the sensor to maintain equilibrium.
		On the one hand, the presence of salt on the SAW surface may explain the tendency of the SAW hygrometer to measure dewpoint (as opposed to frostpoint).
	ghrc.msfc.nasa.gov:5721 /dataset_documents/dc8jplsaw_dataset.html (2434 words)

	Surface Acoustic Wave Linear Motor
		When the Rayleigh wave propagates on elastic material surface, particles on the surface move along an elliptical locus as shown in Fig.
		7 are proportional to wavelength of the SAW.
		An outline of the SAW linear motor was described and the first trial and the first success of the miniaturized SAW linear motor driven at 50 MHz was demonstrated.
	www.intellect.pe.u-tokyo.ac.jp /research/sawmotor/sawmotor_e.html (1036 words)

	Expert in: Sensors, Surface Acoustic Waves (Site not responding. Last check: 2007-09-17)
		Presently, his emphasis is on studying the applications of these waves for use in a variety of physical, chemical, and biological sensors.
		Sensors using Lamb waves retain all the attractive features of SAW sensors, while providing important additional advantages (such as higher sensitivity, lower operating frequency, the ability to operate in liquid media, and faster response).
		Expert has designed and developed a number of SAW devices such as delay lines, pulse compression filters, resonators, oscillators, and correlators, for use in a variety of radar and communication applications.
	chemindustry.intota.com /viewbio.asp?bioID=603288&perID=107965 (321 words)

	Touchscreen technology options - Elo TouchSystems
		IntelliTouch surface wave is the optical standard of touch.
		The surface wave technology is applied directly to the faceplate of the CRT, so 100% of the image's original brightness and clarity comes through.
		Surface capacitive touchscreens provide a solution for customers who want an alternative to their capacitive options available today.
	www.elotouch.com /products/detech2.asp (591 words)

	Home 2
		Environmentally driven acoustic fluctuations in an ocean waveguide are quite apparent as fluctuations in the interference structure of the acoustic pressure spectrum.
		Acoustic propagation in the water columns over elastic boundaries is studied experimentally both in the laboratory and in the ocean, and is analysed theoretically.
		The emphasis of the book is on the active control of waves in structures, the active isolation of vibrations, the use of distributed strain actuators and sensors, and the active control of structurally radiated sound.
	www.iiav.org /books1.htm (10096 words)

	Traveling wave surface acoustic wave transducer (US4434481)
		A multi-electrode array deposited on a piezoelectric substrate is driven by a traveling-wave voltage generated from a wave delay generating device, such as a tapped coaxial cable.
		The surface acoustic waves travel through the array in proper phase with the exciting signal supplied to the electrodes.
		a traveling wave surface acoustic wave transducer including a plurality of electrode fingers arranged in an array on said surface of said support, said array being provided such that each electrode finger is equally spaced from adjacent electrode fingers, said spacing effecting a periodicity, P; and
	www.delphion.com /details?pn=US04434481__ (337 words)

	OhioLINK ETD: RUIZ, ALBERTO
		SAW velocity spectroscopy has been long considered to be one of the leading candidates for nondestructive characterization of surface-treated metals because of its ability to probe the material properties at different penetration depths depending on the inspection frequency.
		Unfortunately, surface acoustic waves are sensitive to spurious parameters, which are byproducts of the surface treatment, i.e., surface roughness and cold work The experimental results obtained on rough surfaces were compared to both theoretical and computational simulations for surface wave induced dispersion from the literature.
		Finally, we investigated the individual contribution of residual stress by determining the acoustoelastic constants of the material and we present numerical predictions of the effect of texture on the surface wave dispersion.
	rave.ohiolink.edu /etdc/view?acc_num=ucin1077302192 (302 words)

	Koskela: Analysis and Modeling of Surface-Acoustic Wave Resonators, ISBN 951-22-5338-0
		SAW resonators constitute building blocks for radio-frequency SAW bandpass filters, which are widely employed in modern cordless and cellular telecommunication systems.
		The carrying theoretical concept is the excitation of acoustic waves in periodic electrode arrays.
		substrates, and surface transverse waves (STW) in langasite.
	lib.hut.fi /Diss/2001/isbn9512253380 (507 words)

	SAW Filters, SAW Devices and SAW Resonators from COM DEV SAW Products
		COM DEV is a producer of high quality, demanding SAW filters operating in the frequency range from 50 MHz to 3 GHz.
		SAW products from COM DEV meet the most rigorous customer requirements through use of our exact design software complemented by automated, leading edge manufacturing equipment.
		Multiple use RF SAW filters and IF filters are also available.
	www.saw-device.com (279 words)

	Advances in Surface Acoustic Wave Technology, Systems and Applications: Volume 1 - Wal-Mart
		Surface acoustic wave (SAW) devices are recognized for their versatility and efficiency in controlling and processing electrical signals.
		As SAW technology has found its way into mass market products such as TV receivers, pagers, keyless entry systems and cellular phones, the production volume has risen to millions of devices produced every day.
		At the other end of the scale, there are specialized high performance signal processing SAW devices for satellite communication and military applications, such as radar and electronic warfare.
	www.walmart.com /catalog/product.gsp?product_id=1072263 (682 words)

	(WO 99/46856) SURFACE ACOUSTIC WAVE FILTER (Site not responding. Last check: 2007-09-17)
		(57) A surface acoustic wave filter comprising a piezoelectric plate, a plurality of surface acoustic wave propagation paths parallel with one another on the piezoelectric plate, and a coupler for coupling the surface acoustic wave propagation paths.
		An input interdigital transducer and a first reflector are opposed with the coupler interposed between them on at least one of the surface acoustic wave propagation paths.
		This surface acoustic wave filter has a reduced length of propagation paths, and the squareness ratio of the frequency characteristic is improved.
	www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=99/46856.990916 (210 words)

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