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4013983 |
Surface wave electro-mechanical device
The invention relates to elastic surface wave resonators and filters. The device in accordance with the invention is based mainly on the selective reflection of the elastic surface waves. It...
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4006435 |
Method for fabricating a temperature compensated surface wave device
Disclosed is a method for fabricating an acoustic surface wave device having reduced temperature coefficient of propagation delay within a desired range of operating temperatures. In one embodiment...
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4005376 |
Electronically variable surface acoustic wave phase shifter
An electrically variable surface acoustic wave phase shifter including a strate upon which a piezoelectric layer is deposited and separated therefrom by an insulating layer. An electrode is...
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4001767 |
Low diffraction loss-low spurious response LiTaO.sub.3 substrate for surface acoustic wave devices
The particular anisotropy of a specific propagation surface orientation on a single crystal lithium tantalate substrate member is utilized to achieve low diffraction, low spurious response surface...
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3999147 |
Temperature stable surface acoustic wave and oscillator using the device
A temperature stable surface acoustic wave device utilizing reflective gratings in a material such as Y-cut quartz having two propagation directions in which the temperature coefficients of delay...
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3995240 |
Temperature compensated surface wave device
Disclosed is an acoustic surface wave device having reduced temperature coefficient of propagation delay within a desired range of operating temperatures. In one embodiment the device includes a...
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3987377 |
Elastic surface wave propagation device
An elastic surface wave propagation device is disclosed which is composed of a substrate for elastic surface wave propagation and at least one transducer disposed on the major surface of the...
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3975698 |
Fiber acoustic waveguide and system
A fiber acoustic waveguide comprising a single crystal fiber and a single ystal film deposited on the outer elongated surface of the single crystal fiber, wherein the single crystal film has a...
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3974463 |
Elastic surface wave apparatus
An elastic surface wave apparatus, wherein transmission and reception electrode pairs for conversion of electric signals into elastic surface waves are spatially disposed so as to cause said...
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3974464 |
Acoustic ridge waveguide
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...
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3965444 |
Temperature compensated surface acoustic wave devices
A temperature compensated surface acoustic wave device having an SiO 2 film layer upon a substrate of piezoelectric material. The positive temperature coefficient of delay of the piezoelectric...
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3961289 |
Ultrasonic delay material
A spinel-type oxide exhibiting a cooperative Jahn-Teller effect shows an extraordinary reduction of sound velocity therethrough at temperatures near the Jahn-Teller phase transition temperature...
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3956718 |
Crystals having zero temperature coefficients of delay
Crystals or Tl 3 VS 4 , Tl 3 VSe 4 , Tl 3 NbS 4 , Tl 3 NbSe 4 , Tl 3 TaS 4 , and Tl 3 TaSe 4 are disclosed which have a surface containing of normal to a zero temperature coefficient of...
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3956646 |
Lithium niobate piezoelectric substrate for use in an elastic surface wave device
A θ-rotated Y-cut X-propagating piezoelectric substrate of crystalline lithium niobate for use in an elastic surface wave device, wherein the angle θ at which the substrate is cut out is chosen...
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3956647 |
Acoustic surface-wave devices using mono crystalline bismuth silicon oxide substrate
An acoustic surface wave filter comprising a monocrystalline wafer of bismuth silicon oxide having a special orientation of the ASW propagation surface and the interdigital transducers relative to...
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3946338 |
Acoustic wave devices involving perturbation of acoustic velocity by diffusion of metals
Acoustic waveguides, acoustic filters and acoustic reflectors are based upon the discovery of increased acoustic wave velocity in materials such as lithium niobate and lithium tantalate into which...
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3945099 |
Method and apparatus for making a surface wave transducer device
A ferroelectric surface wave transducer device comprising an unpoled ferroelectric substrate having a substantially sinusoidal poled region at a surface thereof. A metal plate electrode is disposed...
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3943389 |
Temperature stabilization of surface acoustic wave substrates
A surface acoustic wave (SAW) structure is disclosed wherein a SAW device is incorporated as an exterior lamina within a composite laminate in order to temperature stabilize the acoustic device....
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3942140 |
Method and means for coupling a multiplicity of surface acoustic wave transducers to a single electromagnetic wave transmission line
The input transducers of a multichannel surface acoustic wave device are electrically connected in a series or series-parallel circuit arrangement and are connected to a single channel...
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3924145 |
Surface wave device having a ferroelectric substrate with a sinusoidal pole region
A ferroelectric surface wave transducer device comprising an unpoled ferroelectric substrate having a substantially sinusoidal poled region at a surface thereof. A metal plate electrode is disposed...
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3906410 |
Surface wave device and method of making
A surface wave device with a lithium niobate substrate and a method of making such devices is disclosed. The lithium niobate substrate has a first pair of edges coincident with (0001) planes and a...
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3886484 |
Acoustic surface wave devices having improved performance versus temperature characteristics
More than one piezoelectric substrate or a single multifaceted piezoelectric substrate, each facet or substrate having interdigital transducers deposited thereon and coupled in cascade, comprise...
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3873858 |
Acoustic surface wave phase shifter
An acoustic surface wave phase shifter including a piezoelectric medium for propagating a surface wave and a conducting device disposed proximate a surface of the piezoelectric medium on which a...
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3873946 |
Acoustic surface wave tapped delay line
An acoustic surface wave device wherein a transducer launches a main beam of acoustic surface wave energy on a substrate of piezoelectric material in a first direction in which the material...
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3872410 |
SURFACE WAVE FILTER FOR TV IF STAGE
Increased selectivity is accomplished by arranging the input and output transducers of an acousto-electric surface-wave filter in series on a common piezo-electric substrate. Undesired signal...
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3866153 |
ULTRA LOW DIFFRACTION LOSS SUBSTRATE MEMBERS FOR ACOUSTIC SURFACE WAVE DEVICES
The particular anisotropy of specific propagation surface orientations on bismuth germanium oxide substrate members is utilized to achieve minimal diffraction acoustic surface wave propagation. A...
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3862431 |
SIGNAL PROCESSING APPARATUS
Signal processing apparatus wherein acoustic waves are generated and propagated through a piezoelectric semiconductor so as to parametrically interact adjacent to an output electrode so as to...
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3840826 |
VARIABLE DELAY DEVICES USING FERROELASTIC-FERROELECTRIC MATERIALS
An electronically variable time-delay device, utilizing either surface-wave or longitudinal-wave acoustic signals, comprises a crystal of ferroelastic and ferroelectric material. The crystal...
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3833867 |
ACOUSTIC SURFACE WAVE CONVOLVER WITH BIDIRECTIONAL AMPLIFICATION
Apparatus for the convolution of two input signals introduced at opposite ends of an acoustic surface wave propagation medium provides amplification of the two oppositely propagating signals and...
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3828283 |
METHOD FOR IMPROVING SEMICONDUCTOR SURFACE WAVE TRANSDUCER EFFICIENCY
An improved semiconductor surface wave transducer and method for improving the efficiency of a surface wave transducer comprising a semiconductor substrate upon which is deposited a thin...
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3827002 |
TUNABLE ELECTROACOUSTIC TRANSDUCERS
A plurality of electroacoustic stripe electrodes are formed as a thin film n the surface of a piezoelectric semiconductor slab. The electrode-semiconductor interface forms a varactor junction. By...
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3818382 |
SURFACE WAVE DELAY LINE STRUCTURES HAVING REDUCED TEMPERATURE COEFFICIENT OF DELAY TIME
A surface vibratory wave system having signal coupling electrodes wherein the variation in electrical circuit characteristics is reduced by propagating surface waves through the delay medium in...
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3805195 |
ADAPTIVE SURFACE WAVE DEVICES
A surface wave acoustic device which comprises a plurality of input and/or output electrodes in contact with the surface of a ferroelectric material which exhibits piezoelectric properties. The...
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3795879 |
COMPOSITE DISPERSIVE FILTER
A surface-wave device upon whose surface an acoustic wave may be made to propagate by the transduction of an electrical signal, which may be applied to the input of the device, comprising a...
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3771072 |
LOW VELOCITY ZERO TEMPERATURE COEFFICIENT ACOUSTIC SURFACE WAVE DELAY LINE HAVING GROUP AND PHASE VELOCITY VECTOR COINCIDENCE
An acoustic surface wave delay line having a single crystal tellurium dioxide substrate member the acoustic surface wave propagation surface of which substantially coincides with a plane defined by...
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3750056 |
ACOUSTIC SURFACE-WAVE FILTERS AND METHODS OF MANUFACTURE THEREFOR
A surface-wave filter has a wave-propagating medium of ferroelectric material that exhibits a rate of change of surface-wave velocity which increases with increasing degree of poling more rapidly...
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3737811 |
ACOUSTIC SURFACE WAVE DEVICE WHEREIN ACOUSTIC SURFACE WAVES MAY BE PROPAGATED WITH AN ELECTRIC FIELD DEPENDENT VELOCITY
An acoustic wave device relies on its effectiveness not on the piezoelectric effect but on the elastic stiffness effect and the electro-elastic stiffness effect whereby the effectiveness of the...
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3725827 |
HIGH COUPLING LOW DIFFRACTION ACOUSTIC SURFACE WAVE DELAY LINE
An acoustic surface wave delay line having a lithium niobate substrate member the surface wave propagation plane of which is parallel to the lithium niobate crystalline X axis and intersects the...
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3714604 |
SELF-EXCITED ELECTRON-PHONON RESONATOR
A method of obtaining an unlimited, in linear range, resonance of a piezoelectric surface wave by providing a piezoelectric semiconductor crystal having surfaces fulfilling Sommerfield boundary...
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3710465 |
METHOD FOR THE SUBSEQUENT ADJUSTING OF THE TRANSIT TIME OF A PIEZO-ELECTRIC CERAMIC SUBSTRATE FOR AN ELECTRO-ACOUSTICAL DELAY LINE
A method for adjusting or varying the transit time between input and output transducers disposed on a piezo-electric substrate of a polarized ceramic by applying an electrical field in a direction...
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3680009 |
ACOUSTIC SURFACE WAVE DELAY LINE
An acoustic surface wave delay line having a lithium niobate substrate member the surface wave propagation plane of which is parallel to the lithium niobate crystalline X axis and intersects the...
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3713036 |
Title is not available
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