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4181904 |
Acoustic-wave convolvers utilizing diffused waveguides and beam compression techniques
Two input transducers launch oppositely-propagating acoustic surface waves on a piezoelectric substrate. The waves are compressed to a smaller beamwidth and then laterally confined in a diffused...
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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...
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4151492 |
Surface acoustic wave grating
A reflective grating for a surface acoustic wave device is formed of interleaved sets of contiguous metal strips deposited on the surface of the device. The metal in one set of the strips has a...
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4146852 |
Phase weighted acoustic reflective array compressor
An acoustic surface wave signal transmission device includes a medium having a surface suitable for propagating acoustic energy or waves and having a first impedance characteristic. The surface of...
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4144507 |
Surface acoustic wave resonator incorporating coupling transducer into reflecting arrays
Acoustic surface wave resonator structure in which coupling transducers are incorporated within reflecting arrays. Heretofore, acoustic surface wave resonator devices have included one or more...
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4128615 |
Method for processing an electric signal using elastic surface waves
A system realizing various processings of signals, depending on the nature, duration and form of these signals, by means of non-linear interactions between elastic surface waves or between elastic...
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4124828 |
Surface wave device for treating signals
A device for treating electrical signals by correlation or convolution, by means of elastic surface waves. It comprises a semiconductor substrate on which a network of Schottky diodes is formed and...
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4117424 |
Acoustic wave devices
A crystalline body having two or more domains interfacing at respective domain walls is utilized as an acoustic wave device. Input and output transducers and, in some embodiments, acoustic wave...
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4097825 |
Surface acoustic wave tapped delay line
A surface acoustic wave device having spaced tapping output transducers disposed in the path of surface acoustic wave energy propagating along a planar substrate surface from an input transducer....
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4096477 |
Identification system using coded passive transponders
An identification system including a transmitter, a receiver, a decoding subsystem, and a passive transponder identifier. One passive transponder identifier of the invention is a surface acoustic...
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4088969 |
Tapped surface acoustic wave delay line
A tapped surface acoustic wave (SAW) delay line with time-resolved outputs sing piezoelectric leaky wave coupling and bulk wave amplification, and having low loss characteristics. A solid...
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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...
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4055820 |
Reflective dot array for acoustic wave processing
An apparatus for processing acoustic signals wherein an array of discrete scatterers on a substrate reflect an incident acoustic surface wave on the substrate in accordance with a predetermined...
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4048594 |
Surface acoustic wave filter
A surface acoustic wave device useful as a notch filter or a narrow-band transmission filter, the device including a periodic metallic grating disposed on a suitable surface acoustic wave...
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4038614 |
Fractional efficiency coupler
Surface acoustic wave devices having broadband characteristics with a desired transfer efficiency of less than unity at a desired center frequency are described, the devices incorporate a...
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4034288 |
System for measuring the frequency of an electrical signal
The present invention relates to system for measuring the frequency of an electrical signal. The device in accordance with the invention comprises, deposited upon a piezo-electric substrate a...
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4025954 |
Piezoelectric device for image readout
A device which converts the spatial distribution of the received light energy into a modulation of an electric signal. It comprises: a non-piezoelectric substrate; an electro-mechanical transducer...
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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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4006436 |
Surface acoustic wave delay lines
A surface acoustic wave delay line uses a closed loop principle with separate input and output transducers side by side. 3dB Multistrip couplers are introduced to achieve substantially 100%...
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4004254 |
Swif with side lobe compensation barrier
An acoustic surface wave filter comprises a piezoelectric substrate defining a propagating surface upon which a transmitting and receiving transducer pair are formed in offset alignment. An...
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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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3980962 |
Demodulators
A demodulator for a digital code differential phase shift modulated signal comprising: an input transducer for launching surface acoustic waves corresponding to a received modulated signal; a...
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3952269 |
Surface acoustic wave delay line
A surface acoustic wave device wherein spaced input and output transducers are disposed on a piezoelectric substrate and wherein a time delay or insertion phase compensation structure is disposed...
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3947783 |
Acoustic surface wave device comprising arrays of parallel metallic strips
The invention concerns acoustic surface wave devices with multistrip couplers. The coupler of such a device comprises two arrays of N conductive strips connected by a connecting array and having at...
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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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3940720 |
Recirculating electric and acoustic tapped delay line
The recirculating tapped delay line in accordance with the invention is a combination electrical and acoustic recirculation network that includes a selected number of acoustic surface wave...
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3906432 |
Grating guides for acoustic surface waves
Waveguides for use with guided elastic waves wherein the lateral leakage rate of the waveguides is very small. The decreased leakage rate is effected by longitudinal strip regions or gratings...
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3893047 |
Acoustic surface wave transmission system
A system for processing a signal during its transmission in the form of acoustic surface waves. A piezoelectric substrate, having transmitting and receiving transducers and at least one grating...
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3883831 |
Surface wave devices
A device for handling surface elastic waves using a plurality of reflective elements, such as grooves, on the surface thereof the dimensional characteristics of which may be arranged to vary in a...
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3882430 |
Surface acoustic wave devices
The surface acoustic wave devices of the invention utilise the reflection of acoustic waves at gratings of irregularly spaced discontinuities, said devices comprising between an input (3) and an...
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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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3845420 |
SURFACE ACOUSTIC WAVE PHASE CONTROL DEVICE
A surface acoustic wave device in which a phase or velocity shifting electrically conductive layer is located between the receiving and transmitting transducers. In one embodiment as a filter, the...
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3753164 |
ACOUSTIC SURFACE WAVE FILTER
A surface-wave filter has an input transducer for launching acoustic surface waves together with an output transducer that responds to those waves for developing an output signal. The input...
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3697899 |
ACOUSTIC SURFACE WAVE TRANSMISSION DEVICE
A surface wave integratable filter includes input and output transducers spaced apart on an acoustic wave propagating medium. The input transducer launches acoustic surface waves along a path in...
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3568102 |
SPLIT SURFACE WAVE ACOUSTIC DELAY LINE
An acoustic delay line having an input and a plurality of output transducers is provided which includes at least one reflective grating, a plurality of adjacent spaced conductive strips, coupled to...
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