Matches 251 - 300 out of 343 < 1 2 3 4 5 6 7 >
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4543293 Polarized, shaped material of copolymer of vinylidene fluoride  
Disclosed is a polarized, shaped material comprising a copolymer of 40 to 87 mol % of vinylidene fluoride, 10 to 40 mol % of trifluoroethylene and 3 to 20 mol % of vinyl fluoride.
4539501 Epitaxial structure with increased piezoelectric effect and a surface acoustic wave electronic device comprising such a structure  
An epitaxial structure in which a constraint imposed by forced epitaxy causes an increase in the piezoelectric effect of a group of layers. The structure which provides this effect utilizes a...
4525643 Temperature compensated orientations of berlinite for surface acoustic wave devices  
A piezoelectric wafer of single crystal berlinite, having a surface defined by an X-axis boule cut at an angle in the range from about 94°-104°, provides an improved substrate for a surface...
4523119 Application of lithium tetraborate to saw devices  
An electronic device, such as a Surface Wave, Bulk Wave or pyroelectric device, exploiting the polar nature of an active material in which the active material is lithium tetraborate or a closely...
4516049 Multi-layer acoustic surface wave device having minimal delay time temperature coefficient  
An acoustic surface wave device includes a substrate made of an elastic material, a multilayer structure disposed on a surface of the substrate and having a silicon dioxide layer and an aluminum...
4511816 Surface acoustic wave device using an elastic substrate and an aluminum nitride piezoelectric film  
A surface acoustic wave device comprises an elastic substrate having a major surface with a given crystal orientation and having a positive temperature coefficient of delay (TCD), and AlN film...
4511817 Temperature compensated orientation of berlinite for surface acoustic wave devices  
A piezoelectric wafer of single crystal berlinite, having a surface defined by an X-axis boule cut at about 85°, provides a improved substrate for a surface acoustic wave device. The 85° cut...
4501987 Surface acoustic wave transducer using a split-finger electrode on a multi-layered substrate  
A surface acoustic wave transducer has a multilayered substrate which is made of a nonpiezoelectric plate which has a surface which is coated with a piezoelectric film, and has an interdigital...
4499393 Surface acoustic wave spectrum analyzer  
A surface acoustic wave (SAW) device configured to operate as a spectrum analyzer, and having an array of input transducers disposed on a substrate in such positions as to produce a focused beam of...
4489289 Saw oscillator with digital compensation for temperature related frequency changes  
The inherent temperature instability of surface acoustic wave (SAW) clock oscillators is improved by the use of a thermometer oscillator circuit that senses temperature changes in the SAW...
4489250 Temperature compensated surface acoustic wave device  
A surface acoustic wave device having a lithium tatraborate single crystal substrate is proposed. An electro-mechanical coupling coefficient K 2 of the substrate is about 1% so as to obtain a...
4484098 Environmentally stable lithium niobate acoustic wave devices  
Acoustic Wave Devices comprise lithium niobate substrates 6, 22 having the principal plane cut at zero degrees and 128°, respectively, with respect to the Y crystallographic axis thereof,...
4482833 Method for obtaining oriented gold and piezoelectric films  
A transducer with thin films of gold having a high degree of orientation on surfaces previously yielding only unoriented gold has a layer of glass over the surface of the substrate material...
4464635 Non-reactive limiter  
A non-reactive limiter for limiting the amplitude of a carrier signal amplitude modulated by a modulating signal comprises a voltage divider including a fixed resistance and a variable resistance,...
4449107 Surface elastic wave element  
A surface elastic wave element comprising a (110)-oriented silicon substrate, a zinc oxide layer formed on the silicon substrate and electrodes formed on the zinc oxide layer so as to propagate...
4447754 Broad band surface acoustic wave edge deposited transducer  
A broad band surface acoustic wave (SAW) device has an edge-deposited transducer (EDT) capable of frequencies in excess of 1 GHz and bandwidths in the hundreds of MHz. The device includes a...
4409571 Surface acoustic wave filters  
Surface acoustic wave bandpass transversal filters, e.g. television intermediate frequency filters, comprising a +θ° rotated Y-cut X-propagating lithium niobate substrate with θ in the range...
4409570 Separated substrate acoustic wave device  
A separated substrate acoustic wave device having an active piezoelectric substrate and a separate base substrate. Input and output transducers are mounted upon the base substrate. The active...
4400640 Temperature stable cuts of quartz  
Temperature stable cuts of quartz comprise the families of doubly rotated cuts defined by (YXwlt) 0/27/138, 7/27/135.5, 15/40/40, 15/30/38, 12.5/35/130 and rotational equivalents thereof. It is...
4398115 Temperature probe using a plate of quartz  
A quartz crystal plate (L) is used in determining the frequency of a frequency generator, and the frequency determined by said plate is variable as a function of temperature. The quartz plate...
4395913 Broadband electromagnetic acoustic transducers  
A broadband electromagnetic acoustic transducer is disclosed for use with an electrically conductive object. The transducer includes a source of magnetic flux for establishing a static magnetic...
4382386 Elastic surface wave pressure gauge and pressure sensor for such a gauge  
The invention relates to elastic surface wave pressure gauges. The gauge comprises a plate on which are located the electronic components of the gauge and a pressure sensor grouping the...
4358745 Semiconductor surface acoustic wave device  
Surface acoustic wave devices with selectable performance parameters such as having a temperature coefficient of zero, may be fabricated employing a monocrystalline semiconductor substrate with a...
4354130 Surface acoustic wave device using a multi-layer substrate including α.sub.2 O.sub.3, SiO and ZnO  
This invention provides a surface acoustic wave device which comprises a multi-layered substrate. The multi-layered substrate comprises at least a piezoelectric zinc oxide layer, an intermediate...
4345176 Temperature compensated gallium arsenide surface acoustic wave devices  
Temperature compensation is provided to a surface acoustic wave device including acoustoelectric transducers (12, 14) formed on a surface of a gallium arsenide substrate (10), by a composite layer...
4333842 Piezoelectric single crystal and surface acoustic wave element employing the same  
A piezoelectric single crystal which has a composition represented by a general formula (Ba 2 -x Sr x )TiSi 2 O 8 , the value x lying within a range of 0.25≤x≤1.2; and a surface acoustic wave...
4323809 Surface acoustic wave substrate having orthogonal temperature compensated propagation directions and device applications  
Surface acoustic wave devices such as reflective array compressors which utilize orthogonal propagation directions are improved by employing a substrate member the surface acoustic wave propagation...
4270105 Stabilized surface wave device  
A surface acoustic wave (SAW) device is provided with short-term and long-term stability by recessing the electrode structure into the surface of the piezoelectric crystal of the device. In...
4250474 Continuous beam steering acoustic wave transducer  
There is hereinafter described an integral transducer geometry which provides for the angle of an acoustic wave beam, interacting with an optical beam, to be varied as a continuous function of the...
4245200 Method of intermediate frequency filtration in a television receiver  
An elastic surface wave device includes a transducer having an elastic surface wave propagated in the direction of 75 to 133 degrees to a Y-axis on an X-cut lithium tantalate (LiTaO 3 ) substrate.
4238725 Apparatus for checking the direction of polarization of shear-wave ultrasonic transducers  
An apparatus for checking the direction of polarization of shear-wave ultrasonic transducers comprises a first planar surface for mounting the shear-wave transducer, a second planar surface...
4236095 Surface acoustic wave device comprising piezoelectric substrate having zinc oxide layer on α-alumina layer  
A surface acoustic wave device comprising a piezoelectric substrate which comprises an α-alumina layer as a base region and a zinc oxide layer as a surface region formed on the α-alumina layer....
4232240 High piezoelectric coupling X-cuts of lead potassium niobate, Pb.sub.2 Knb.sub.5 O.sub.15 , for surface acoustic wave applications  
A series of lead potassium niobate substrates having X-cut crystallographic orientations defined by the Euler Angles Lambda=90.0°, Mu=90.0° and Theta from -10.6° to +10.6°.
4229506 Piezoelectric crystalline film of zinc oxide and method for making same  
Piezoelectric crystalline film on a substrate, which is a crystalline zinc oxide film with a hexagonal crystal structure and a c-axis substantially perpendicular to the substrate surface, the...
4224548 Singly rotated cut of Y-axis boule lead potassium niobate, Pb.sub.2 KNb.sub. O.sub.15, for surface acoustic wave applications  
A lead potassium niobate substrate having a Y-axis boule crystallographic orientation defined by the Euler Angles Lambda=90.0°, Mu=66.6° and Theta=0.0°.
4224549 Lead potassium niobate substrate member for surface acoustic wave applications  
A lead potassium niobate substrate having a singly rotated cut of the Z axis cylinder with a crystallographic orientation defined by the Euler Angles Lambda=74.4°, Mu=90.0° and Theta=0.0°.
4223286 Surface acoustic wave resonator  
A surface acoustic wave resonator includes a base plate made of glass and a layer of piezoelectric material which has a plurality of strips extending parallel to each other for forming a reflector....
4220888 Double and triple rotated quartz plates for surface waves  
The invention relates to quartz plates. The plate is a plate with double rotation. The angle φ lies between 6° and 10°. The angle θ lies between -41°45' and -38°55'. The direction of...
4189516 Epitaxial crystalline aluminium nitride  
Material suitable for a surface acoustic wave device comprises an epitaxial film of aluminum nitride on the surface of a substrate of single crystal aluminum oxide, said surface having the...
4155055 Wave device having a reverse domain grating  
This invention relates to a wave device comprising a single domain lithium niobate substrate having thereon a grating wherein the grating comprises single domain regions of lithium niobate having...
4150346 Acoustic periodic structure  
An acoustic periodic structure for slow wave propagation and filtering having a corrugated surface with traction-free boundaries which can support a horizontally polarized shear surface wave that...
4142163 Surface acoustic wave device with reduced spurious responses  
This invention relates to a surface acoustic wave device which is comprised of a single domain lithium niobate layer on a multiple domain lithium niobate substrate. On the single domain layer are...
4110653 Method of modifying the temperature drift of the propagation time of surface elastic waves and a device obtained by said method  
The present invention relates to the modification of the temperature-induced drift in propagation time of surface elastic waves. The invention proposes to achieve this modification by selecting a...
4109173 High piezoelectric coupling, low diffraction loss, temperature compensated berlinite substrate members for surface acoustic wave devices  
Doubly rotated propagation surface defining cuts of single crystal berlinite (AIPO 4 ) are utilized to provide temperature compensated surface acoustic wave (SAW) substrates having high...
4109172 High piezoelectric coupling-temperature compensated berlinite substrate member for surface acoustic wave devices  
A singly rotated propagation surface defining cut of single crystal berlinite (AIPO 4 ) is utilized to provide a temperature compensated surface acoustic wave (SAW) substrate having a high...
4078186 Magnetically tuned, surface acoustic wave device  
A surface acoustic wave device having a thin magnetostrictive film deposi on the surface between its input and output transducers. A variable D.C. field is applied to the film to vary its...
4056793 Acoustic waveguide resonator  
An improved acoustic waveguide structure which comprises a ridge waveguide disposed in a horizontal direction extending outwardly from a substrate. The horizontal orientation of the waveguide which...
4055819 Acoustic ridge delay line  
An improved acoustic waveguide structure which comprises a ridge waveguide disposed in a horizontal direction extending outwardly from a substrate. The horizontal orientation of the waveguide which...
4037175 VARIABLE DELAY DEVICE  
A ferroelectric wave transducer device comprising an unpoled ferroelectric substrate having a substantially sinusoidal poled region at a surface thereof. A metal plate electrode is disposed on the...
4019074 LiNbO.sub.3 saw device  
An electro-mechanical transducer comprises a LiNbO 3 -piezoelectric substrate containing as an impurity at least one material selected from the group consisting of Ta, Ta 2 O 5 , Pd, SiO 2 , TiO...
Matches 251 - 300 out of 343 < 1 2 3 4 5 6 7 >