Propagation Path Has Significant Chemical Or Physical Properties Patents (Class 333/147)
  • Patent number: 10770649
    Abstract: A device comprising a first magnetic layer (e.g., Co2MnSi Heusler alloy or a tetragonally distorted perpendicularly magnetized (PMA) Heusler alloy such as Mn3Ga, Mn3Ge, etc.) and a second magnetic layer (e.g., Co2MnSi Heusler alloy or a tetragonally distorted perpendicularly magnetized (PMA) Heusler alloy such as Mn3Ga, Mn3Ge, etc.), and a metal halide tunnel barrier in between the first and second magnetic layers, wherein the metal halide tunnel barrier (e.g., NaF, NaCl, NaBr, LiF, LiCl, and LiBr or their combination) is lattice matched within a predetermined limit (e.g. 5%) of both the first and second magnetic layers.
    Type: Grant
    Filed: February 21, 2019
    Date of Patent: September 8, 2020
    Assignee: International Business Machines Corporation
    Inventor: Aakash Pushp
  • Patent number: 10727804
    Abstract: An integrated circuit is a layered device, on a semiconductor substrate, which contains metal electrodes that sandwich a piezoelectric layer, followed by a magnetostrictive layer and a metal coil. The metal electrodes define an electrical port across which to receive an alternating current (AC) voltage, which is applied across the piezoelectric layer to cause a time-varying strain in the piezoelectric layer. The magnetostrictive layer is to translate the time-varying strain, received by way of a vibration mode from interaction with the piezoelectric layer, into a time-varying electromagnetic field. The metal coil, disposed on the magnetostrictive layer, includes a magnetic port at which to induce a current based on exposure to the time-varying electromagnetic field generated by the magnetostrictive layer.
    Type: Grant
    Filed: October 23, 2017
    Date of Patent: July 28, 2020
    Assignee: Board of Trustees of the University of Illinois
    Inventors: Songbin Gong, Ruochen Lu, Tomas Manzaneque Garcia, Cheng Tu, Daniel Shoemaker, Chengxi Zhao
  • Patent number: 10601400
    Abstract: A filter including a piezoelectric substrate; a surface acoustic wave (SAW) device on the piezoelectric substrate and including unequally spaced interdigitated input and output transducer electrodes of unequal widths, wherein the input transducer electrodes are to convert an incoming radio frequency (RF) electrical signal into surface acoustic waves; a SAW propagation path between the input and output transducer electrodes; and a magnetostrictive film in the SAW propagation path to filter the surface acoustic waves that are at a ferromagnetic resonance frequency of the magnetostrictive film, wherein the output transducer electrodes are to convert the filtered surface acoustic waves into an outgoing electrical RF signal. The SAW device may operate in a wide-band pass configuration. The wide-band pass configuration result in a transmission of frequencies up to ?60 dB. The magnetostrictive film may include a ferromagnetic material.
    Type: Grant
    Filed: August 13, 2018
    Date of Patent: March 24, 2020
    Inventors: Michael E. McConney, Brandon M. Howe, Piyush Shah, Michael R. Page
  • Patent number: 8917152
    Abstract: A spin wave device according to an embodiment includes: an input interconnect transmitting an input impulse signal; a multilayer film including a foundation layer; a first magnetic layer formed on the multilayer film and generating spin waves when receiving the input impulse signal, the spin waves propagating through the first magnetic layer; a plurality of input electrodes arranged in a straight line on the first magnetic layer, being connected to the input interconnect, and transmitting the input impulse signal to the first magnetic layer; and a plurality of sensing electrodes sensing the spin waves, being arranged on the first magnetic layer, and being located at different distances from one another from the straight line having the input electrodes arranged therein, and the following equation is satisfied: d=Vg×t0.
    Type: Grant
    Filed: June 4, 2012
    Date of Patent: December 23, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tsuyoshi Kondo, Hirofumi Morise, Shiho Nakamura
  • Publication number: 20130147579
    Abstract: A spin-wave waveguide includes a ferromagnetic thin film resembling a wire in shape. A part of the ferromagnetic thin film, large in film thickness, is formed at one end of the ferromagnetic thin film, and a part of the ferromagnetic thin film, small in film thickness, and a part of the ferromagnetic thin film, large in film thickness, are alternately formed on the same plane, for at least not less than one cycle. A part of the ferromagnetic thin film, large in film thickness, is formed at the other end of the ferromagnetic thin film, wherein an insulating film, and an electrode film are stacked in this order on the ferromagnetic thin film in the part of the ferromagnetic thin film, large in film thickness.
    Type: Application
    Filed: December 4, 2012
    Publication date: June 13, 2013
    Applicant: HITACHI LTD.
    Inventor: HITACHI LTD.
  • Publication number: 20130082798
    Abstract: The subject application describes systems and methods that drive magnetization switching through magnonic spin transfer torque. A spin current is provided to a first magnetic layer with a first magnetic state. The spin current facilitates magnetization switching via a magnonic spin transfer torque in a second magnetic layer with a second magnetic state that is separated from the first magnetic layer by an interface. Alternatively, a spin current is provided to a first magnetic domain with a first magnetic state. The spin current facilitates domain wall propagation via a magnonic spin transfer torque. The domain wall is between the first magnetic domain and a second magnetic domain in a second magnetic state.
    Type: Application
    Filed: September 28, 2012
    Publication date: April 4, 2013
    Applicant: THE HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGY
    Inventors: Xiangrong Wang, Peng Yan, Xiansi Wang
  • Patent number: 8164148
    Abstract: Provided are a method of generating strong spin waves, a method of simultaneously generating spin waves and electromagnetic waves, a logic operation device using spin waves, a variety of spin wave devices employing the same, and a method of controlling phases of spin waves. In the method of generating spin waves, strong spin waves are generated by supplying various shapes of energies to a magnetic material in which a magnetic vortex and magnetic antivortex spin structures exist separately or together. In the logic operation device, wave factors of frequency, wavelength, amplitude, and phase of a spin wave generated by the method of generating spin waves are controlled and wave characteristics such as reflection, refraction, transmission, tunneling, superposition, interference, and diffraction are used.
    Type: Grant
    Filed: September 28, 2006
    Date of Patent: April 24, 2012
    Assignee: Seoul National University Industry Foundation
    Inventors: Sang-Koog Kim, Ki-Suk Lee, Sang-Kook Choi
  • Publication number: 20080266024
    Abstract: A component working with guided acoustic waves includes a layer system configured to guide waves in a lateral plane. The layer system includes a piezoelectric layer, electrodes on the piezoelectric layer for exciting the wave, a dielectric layer with an acoustic impedance, and an adjustment layer with an acoustic impedance. A ratio of the acoustic impedance of the adjustment layer to the acoustic impedance of the dielectric layer is greater than 1.5.
    Type: Application
    Filed: November 20, 2006
    Publication date: October 30, 2008
    Inventors: Werner Ruile, Markus Hauser, Ulrike Roesler
  • Publication number: 20080231392
    Abstract: Provided are a method of generating strong spin waves, a method of simultaneously generating spin waves and electromagnetic waves, a logic operation device using spin waves, a variety of spin wave devices employing the same, and a method of controlling phases of spin waves. In the method of generating spin waves, strong spin waves are generated by supplying various shapes of energies to a magnetic material in which a magnetic vortex and magnetic antivortex spin structures exist separately or together. When energies are applied to a patterned magnetic material so that magnetic vortex or magnetic antivortex can be generated, a strong torque is generated in a vortex core so that strong spin waves can be generated from the vortex core. The spin waves generated in this way have large amplitudes, short wavelengths, and high frequencies.
    Type: Application
    Filed: September 28, 2006
    Publication date: September 25, 2008
    Inventors: Sang-Koog Kim, Ki-Suk Lee, Sang-Kook Choi
  • Patent number: 6667672
    Abstract: A high power ferrite microwave phase shifter that is both compact and low cost. The ferrite phase shifter includes a waveguide having a first cylinder and a second cylinder, the radius of the second cylinder being less than the radius of the first cylinder. The second cylinder is disposed within the first cylinder such that the two cylinders have a common axis of symmetry. The waveguide includes a first septum formed as a disk and disposed within the second cylinder. The disk has a pie-shaped aperture formed therethrough and is centrally disposed within the second cylinder so that the two cylinders and the disk share the same axis of symmetry. The second cylinder has an opening formed therethrough that is aligned with the pie-shaped aperture. The waveguide further includes a second septum that extends from the first cylinder to the disk center while bisecting the pie-shaped aperture, thereby separating an input from an output of the ferrite phase shifter.
    Type: Grant
    Filed: May 21, 2002
    Date of Patent: December 23, 2003
    Assignee: M/A-Com, Inc.
    Inventor: Wayne Dean Fowler
  • Patent number: 6426156
    Abstract: A magnetic garnet single crystal film used for a magnetostatic wave device has a Pb content in the range of from more than zero to about 4,000 ppm by weight.
    Type: Grant
    Filed: January 30, 2001
    Date of Patent: July 30, 2002
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Masaru Fujino
  • Patent number: 6194091
    Abstract: A magnetostatic wave device comprises a magnetic garnet single crystal film. The single crystal film magnetic garnet is represented by the general formula of Y3Fe5-x-yInxMyO12 (wherein M is at least one of Ga, Al and Sc, 0.01≦x≦0.45 and 0≦y≦1.2) and the Curie temperature is about 150° C. to 285° C.
    Type: Grant
    Filed: September 25, 1998
    Date of Patent: February 27, 2001
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Masaru Fujino
  • Patent number: 6121856
    Abstract: A bulk acoustic wave delay line is disclosed having a thin, amorphous metal substrate, and deposited on the first and second surface at each end of which is a very thin layer of a piezoelectric material. Positioned on each piezoelectric material layered area are a plurality of interleaved electrodes with a first portion of each plurality of electrodes being interconnected and a second portion of each plurality of electrodes being interconnected. The electrodes on the first and second surface at one end of said device are energized with electrical signals in a phased or un-phased manner to generate selected modes of pure Lamb waves in said substrate.
    Type: Grant
    Filed: August 21, 1998
    Date of Patent: September 19, 2000
    Assignee: Lockheed Martin Corporation
    Inventor: John T. Apostolos
  • Patent number: 6016088
    Abstract: A magnetostatic wave device comprises a Y.sub.3 Fe.sub.5 O.sub.12 -based magnetic garnet single crystal film, and the magnetic garnet single crystal film contains indium as a substitute for a part of iron, and having a saturation magnetization ranging from 1,800 G to 3,500 G.
    Type: Grant
    Filed: September 18, 1998
    Date of Patent: January 18, 2000
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Masaru Fujino
  • Patent number: 5985472
    Abstract: There is provided a magnetostatic wave device which operates even with a substitution R, A:YIG having a small film thickness and which has a wider operational frequency band. A magnetostatic wave device comprising a magnetic garnet film is provided which is made of a material expressed by a general formula: (Y.sub.1-r R.sub.r).sub.3 (Fe.sub.1-a A.sub.a).sub.5 O.sub.12 where R is at least one selected from among La, Bi, Gd and Lu; A is at least one selected from among Al, Ga, In and Sc; r and a are within the ranges 0.ltoreq.r.ltoreq.1 and 0.ltoreq.a<1, respectively; and r and a can not be zero at the same time. Further, the crystal structure of said magnetic garnet film is a superlattice.
    Type: Grant
    Filed: June 16, 1997
    Date of Patent: November 16, 1999
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Mikio Geho, Masaru Fujino, Takashi Fujii, Hiroshi Takagi
  • Patent number: 5828274
    Abstract: Ultrasonic buffer rods are useful for on-line process control of industrial material processes at elevated temperatures. In order to increase the signal-to-noise ratio in the reflected ultrasonic waves revealing the information of the condition of the materials being processed, clad ultrasonic waveguides consisting of a tapered or uniform core and a cladding are proposed. The core is made of a low ultrasonic loss material. Preferably, the cladding has a higher ultrasonic velocity than the core. The cladding may be thermally sprayed over the core. The waveguides are simple, rugged, machinable and operable at elevated temperatures.
    Type: Grant
    Filed: May 28, 1996
    Date of Patent: October 27, 1998
    Assignee: National Research Council of Canada
    Inventors: Chen-Kuei Jen, Jean-Gabriel Legoux
  • Patent number: 5606297
    Abstract: A waveguide for projecting a longitudinal acoustic wave of wavelength .lambda. from an ultrasound energy source toward a target area. The waveguide has at least one tubular channel. The channel has inwardly tapered, conical inlet and outlet ports separated by a venturi. The inlet port taper defines a sharply rimmed entry orifice around the inlet port. A separation distance equal to one wavelength .lambda. is maintained between the source and the waveguide's inlet port. The waveguide shears off a cross-section of the wave emitted by the energy source and ejects it at accelerated velocity toward the target area. The channel has a length L and the venturi has a diameter D, such that the waveguide has an emitted beam angle equal to 2 (tan.sup.-1 (D/L)). Preferably, a plurality of tubular channels are aligned concentrically around and longitudinally parallel to the one tubular channel, each channel having a selected length and a selected diameter.
    Type: Grant
    Filed: January 16, 1996
    Date of Patent: February 25, 1997
    Assignee: Novax Industries Corporation
    Inventor: William A. Phillips
  • Patent number: 5601935
    Abstract: A surface magnetostatic wave device includes an Fe-containing garnet single crystal film grown on a gadolinium gallium garnet substrate. The crystallographic plane azimuth of the gadolinium gallium garnet substrate can be one of a (110) plane, a (100) plane, and a (211) plane. The device achieves both a reduced saturation magnetization and a reduced anisotropic magnetic field to thereby minimize the lowest frequency in the propagation band.
    Type: Grant
    Filed: September 7, 1994
    Date of Patent: February 11, 1997
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Masaru Fujino, Takashi Fujii, Makoto Kumatoriya, Takenori Sekijima, Hiroshi Takagi
  • Patent number: 5351219
    Abstract: An acoustic device has an acoustic wave propagating medium exhibiting elastic abnormality in the vicinity of a Curie temperature. It is desirable that such an acoustic wave propagating medium be formed of a ferroelectric substance or a high-elastic substance and, in particular, have a Curie temperature at normal temperatures. For example, such ferroelectric substance is a solid solution expressed by Cs(Pb.sub.1-x Sr.sub.x)(Cl.sub.1-y Br.sub.y).sub.3 or (Bi.sub.1-x Dy.sub.x)VO.sub.4. By changing values of x and y appropriately, the Curie temperature of the solid solution can be varied, and an acoustic wave propagating medium meeting the purpose of use can be obtained. In such an acoustic wave propagating medium, an elastic coefficient C.sup.P at the time of constant polarization differs greatly from an elastic coefficient C.sup.E at the time of a constant electric field in the vicinity of the Curie temperature. Accordingly, the propagation velocity of acoustic waves is greatly different, too.
    Type: Grant
    Filed: February 4, 1992
    Date of Patent: September 27, 1994
    Assignee: Olympus Optical Co., Ltd.
    Inventors: Hideo Adachi, Yoshihiro Ishibashi
  • Patent number: 5241287
    Abstract: Acoustic buffer rods are useful in the nondestructive ultrasonic evaluation of materials. In order to reduce the occurrence of spurious signals in the reflected acoustic waves forming an acoustic "image" of a sample, it is proposed to design buffer rods such that their radial acoustic velocity profile is graded, preferably having a parabolic shape. The lowest acoustic velocity of the buffer rod is in its center, i.e. at the longitudinal axis of the rod. This design is applicable to both uncladded buffer rods as well as to the core of cladded ones.
    Type: Grant
    Filed: December 2, 1991
    Date of Patent: August 31, 1993
    Assignee: National Research Council of Canada
    Inventor: Cheng-Kuei Jen
  • Patent number: 5142254
    Abstract: An ultrasonic delay line device has an adjusting circuit for adjusting delay time provided between two terminals at the power input side of an ultrasonic delay line, wherein the adjusting circuit includes a serial connection of a fixed capacitor and a variable resistor connected between said two terminals of the power input side and a fixed coil connected in parallel with the serial connection of the fixed capacitor and the variable resistor.
    Type: Grant
    Filed: August 31, 1990
    Date of Patent: August 25, 1992
    Assignee: Asahi Glass Company Ltd.
    Inventors: Etsuji Kimura, Naomitsu Umemura, Masahiko Maeda
  • Patent number: 5122766
    Abstract: A delay device for a frequency signal comprises an element made of acousto-optical material, provided with a first piezo-electric transducer transmitting an acoustic signal in the element and with a second piezoelectric transducer capable of detecting an acoustic wave. A light beam goes through the element and creates a field charge in the element. This charge field plays the role of a reflector for the acoustic wave transmitted by the transducer. By translating the beam along the direction Z, the propagation time of the transmitted acoustic wave is made to vary.
    Type: Grant
    Filed: December 20, 1989
    Date of Patent: June 16, 1992
    Assignee: Thomson-CSF
    Inventors: Jean-Pierre Huignard, Philippe Defranould
  • Patent number: 5056137
    Abstract: In a method and apparatus for encoding signals, signals are passed through a body of a material that modifies a characteristic of signals passing therethrough, such as an acousto-electromagnetic. Energy is applied to the body for establishing a standing wave therein, so that the standing wave controls the passage of signals through said body. The energy may be applied by a piezoelectric element. The body or the piezoelectric element may be removable, to form an encoding key.
    Type: Grant
    Filed: September 27, 1989
    Date of Patent: October 8, 1991
    Inventor: Richard R. Sills
  • Patent number: 4912478
    Abstract: A phased array radar antenna utilizing signal time delay magnetostatic spin wave devices operable to provide feed line transmit time control for variable length transmission feed lines. The preferred embodiment of an improved phased array radar antenna incorporates ferrite devices controlled by d.c. voltage driven ferroelectrics.
    Type: Grant
    Filed: December 22, 1988
    Date of Patent: March 27, 1990
    Assignee: Westinghouse Electric Corp.
    Inventor: Michael R. Daniel
  • Patent number: 4743870
    Abstract: An elastic waveguide, for propagating acoustic waves, consists of an elongated solid core region and an elongated solid outer cladding region. The acoustic waves propagate in a mode where the principle particle displacement is substantially parallel to the longitudinal axis of the waveguide, this mode is called longitudinal mode. The material densities and the bulk shear wave velocities of the core and cladding region are substantially the same but the bulk longitudinal wave velocity of the cladding region is larger than that of the core region.
    Type: Grant
    Filed: September 23, 1986
    Date of Patent: May 10, 1988
    Assignee: Canadian Patents and Development Ltd.
    Inventors: Cheng K. Jen, Ahmad Safaai-Jazi, Jean F. Bussiere, Gerald W. Farnell
  • Patent number: 4742318
    Abstract: A birefringent single-mode acoustic fiber for propagating linearly polarized shear acoustic waves while preserving linear polarization, comprises an elongated core region of a solid material in which acoustic waves can be propagated in two orthogonal shear mode components, and a cladding region enclosing all surfaces of the core region except end surfaces thereof, the cladding region being also of a solid material in which acoustic waves can be propagated in two orthogonal shear mode components.
    Type: Grant
    Filed: March 19, 1987
    Date of Patent: May 3, 1988
    Assignee: Canadian Patents and Development Limited - Societe Canadienne Des Brevets et D'Exploitation Limitee
    Inventors: Cheng-Kuei Jen, Gerald W. Farnell, Ahmad Safaai-Jazi
  • Patent number: 4691178
    Abstract: An ultrasonic delay line including an input transducer for producing a sound wave depending on an input voltage, a delay medium for transmitting the sound wave produced by the input transducer and an output transducer for receiving the sound wave transmitted in the delay medium has a shape such that sound waves transmitted in the delay medium are misdirected with respect to the output transducer by a predetermined amount. As a result, a substantial part of a main signal is input into the output transducer, whereas a substantial part of the sound waves having the third or higher harmonic component with respect to the main signal misses the output transducer due to the higher directivity of these higher frequency components in the delay medium.
    Type: Grant
    Filed: April 23, 1986
    Date of Patent: September 1, 1987
    Assignee: Asahi Glass Company Ltd.
    Inventors: Takeshi Okada, Haruto Hashimoto, Michihiko Uemura
  • Patent number: 4675682
    Abstract: An arrangement for improving the frequency plane delay linearity of a frequency dispersive delay line of the type employing ferrite film materials such as yttrium iron garnet. Linearity improvement involves use of frequency selective transducers located at successively different delay locations in the transmitting and receiving areas of the delay line together with ground plane effects and out of phase signal coupling to the transducer elements including exemplary use of a particular type of microwave transmission line for coupling to the magnetic film.
    Type: Grant
    Filed: October 18, 1984
    Date of Patent: June 23, 1987
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: John D. Adam, Michael R. Daniel
  • Patent number: 4614919
    Abstract: A magnetostatic wave frequency analyzer apparatus utilizing forward volume waves. A single input transducer is arranged opposite a plurality of output transducers to receive the different frequencies of the generated magnetostatic forward volume wave. A geometric ground plane is positioned in the propagation path between the input transducer and the plurality of output transducers to demonstrate the propagation characteristics of magnetostatic forward volume waves (MSFVW) in the 2-6 GHz range. The waves were propagated in two inch diameter YIG La-doped films of varying thickness (20,30,40 microns). The waves were launched by the microstrip input transducers on an alumina substrate. Receiver transducers were also on the substrate, but placed approximately one inch away, in a semi-circle with 10 degrees of arc between adjacent transducers.
    Type: Grant
    Filed: July 3, 1984
    Date of Patent: September 30, 1986
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Robert E. Floyd
  • Patent number: 4614923
    Abstract: Method for the controlled suppression of magnetostatic waves within magnetic garnet films for microwave circuit applications, based upon the adoption of multilayer structures of epitaxial garnet films of low magnetic losses and high magnetic losses.
    Type: Grant
    Filed: February 21, 1985
    Date of Patent: September 30, 1986
    Assignees: Selenia Industrie Elettroniche Associate SpA, I.E.S.S. C.N.R.
    Inventors: Riccardo Roveda, Carlo Di Gregorio, Paolo De Gasperis, Giuseppe Miccoli
  • Patent number: 4609890
    Abstract: An acoustic wave signal processing device which in a preferred embodiment utilizes at least one holographic grating formed within a portion of the interior of a substrate which is capable of supporting the propagation of bulk acoustic wave signals therein. The grating provides spatially varying acoustic impedances within the substrate and interacts with bulk acoustic wave signals propagated therethrough so as to produce output acoustic wave signals. The grating and transducers for producing and receiving the input and output bulk acoustic wave signals, respectively, can be arranged to provide a variety of signal processing operations which may be desired, such as providing resonating operations and filter operations, for example.
    Type: Grant
    Filed: October 29, 1984
    Date of Patent: September 2, 1986
    Inventors: Daniel E. Oates, Peter V. Wright
  • Patent number: 4571562
    Abstract: The invention relates to tunable selective devices based on magnetostatic volume waves and has as its object to provide a device comprising two resonator networks arranged to exchange magnetostatic volume waves via a selective return reflector network, in which the reflector network is devised so as to eliminate the longitudinal intereference modes present around the required longitudinal mode. The invention is applicable in particular to the filtering of electrical signals at very high frequency, to the production of tunable oscillators and to the measurement of magnetic fields.
    Type: Grant
    Filed: May 25, 1984
    Date of Patent: February 18, 1986
    Assignee: Thomson-CSF
    Inventor: Jean-Paul Castera
  • Patent number: 4554519
    Abstract: A magnetostatic wave device operating within a biasing magnetic field for delaying microwave signals is described including a layer of YIG material having a predetermined thickness, first and second transducers spaced apart for generating and receiving magnetostatic waves in the YIG material and a ground plane having a plurality of spacings from said YIG material, each spacing having a predetermined length along the propagation path between the first and second transducers. The invention further includes first and second layers of YIG material, first and second transducers spaced apart for generating magnetostatic waves in said first material and said first material having a plurality of spacings from said second material, each spacing having a predetermined length along the propagation path from said first to said second transducer. The invention overcomes the problem of undesired phase or group delay variations from a desired linear or quadratic phase variation as a function of frequency.
    Type: Grant
    Filed: October 17, 1983
    Date of Patent: November 19, 1985
    Assignee: Westinghouse Electric Corp.
    Inventor: John D. Adam
  • Patent number: 4539501
    Abstract: 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 semi-insulating substrate made from a first material on which is deposited by forced epitaxy a layer of a second material, the two materials are in crystalline mesh parameter disharmony, which creates in said layer a constraint increasing its piezoelectricity. On the constrained layer are deposited two groups of alternated "deforming" and "deformed" layers of the two materials. The thickness of the structure is sufficient to allow propagation of the surface waves. The advantage of this structure is that it allows two transducers such as transistors to be integrated on or at the side of this structure.
    Type: Grant
    Filed: December 19, 1983
    Date of Patent: September 3, 1985
    Assignee: Thompson-CSF
    Inventors: Linh N. Trong, Jean Chevrier
  • Patent number: 4488127
    Abstract: A bifurcated electroacoustic delay line exhibits at least a pair of substantially identical branches, each assuming a generally pentagonal profile. Each branch is configured to provide (2n+3) reflections of a desired wave at five reflective facets. The reflective pattern so defined tends to maximize the surface area available for the deposition of absorbent material so as to thereby and otherwise minimize spurious transmissions.The branches are physically joined along one side so as to define an area of bifurcation. A plurality of piezoelectric transducers are bonded at the area of bifurcation in a pairwise laterally adjacent manner. An inductance couples electrical energy from the output transducer of the first branch to the input transducer of the second branch.
    Type: Grant
    Filed: April 22, 1983
    Date of Patent: December 11, 1984
    Assignee: GTE Products Corporation
    Inventor: Roger G. Claes
  • Patent number: 4477783
    Abstract: The disclosure is directed to an ultrasonic transducer device that includes a plurality of layers of piezoelectric material. A plurality of conductive electrodes are disposed on the layers of piezoelectric material such that each layer of piezoelectric material has electrodes on opposing surfaces thereof. A series string of electronic delay means is provided, and has successive stages that are respectively coupled between pairs of the electrodes. An input/output terminal is coupled to an end of the series string of electronic delay means. The time delay of each electronic delay means is selected as a function of the ultrasonic wave propagation time through the piezoelectric material across which the electronic delay means is coupled. Preferably, the time delay of each electronic delay means is substantially equal to the ultrasonic wave propagation time through the piezoelectric material across which the electronic delay means is coupled.
    Type: Grant
    Filed: August 19, 1982
    Date of Patent: October 16, 1984
    Assignee: New York Institute of Technology
    Inventor: William E. Glenn
  • Patent number: 4472692
    Abstract: Tunable selective devices utilizing forward magnetostatic bulk waves. A filter is able to act as an oscillator loop or as a passive transmission system in which two resonant cavities including gratings are so arranged that via a selective reflector grating they may exchange magnetostatic bulk waves energized and intercepted by transducers of the microstrip type. The invention relates in particular to the filtering of very high frequency electric signals, and to the production of tunable oscillators and to measuring magnetic fields.
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: September 18, 1984
    Assignee: Thomson-CSF
    Inventors: Pierre Hartemann, Jean P. Castera, Jean M. Dupont
  • Patent number: 4419637
    Abstract: A magnetostatic wave device in which waves propagate in a layer of magnetic material grown on a non-magnetic crystalline substrate with a grating arranged in the wave path for modifying propagation velocity. The grating is formed by ion implantation without removal of magnetic material so coupling with spin modes is avoided.
    Type: Grant
    Filed: January 28, 1982
    Date of Patent: December 6, 1983
    Assignee: Thomson-CSF
    Inventors: Gerard Volluet, Pierre Hartemann
  • Patent number: 4400669
    Abstract: The linearity of group delay versus frequency in magnetostatic wave delay lines is improved by a linear variation of one of three discrete parameters in the region between the two delay line transducers. The parameter variation is applied to magnetostatic wave delay lines that have a ground plane, a magnetic garnet crystal film substrate that is spaced from the ground plane and has transmitting and receiving transducers engaged to it, and a magnetic bias field. The discrete parameters varied are the magnetic bias field; the distance of the substrate from the ground plane; and the thickness of the substrate. Appropriate linear variations of any one of the these parameters provides improved linearity of group delay versus frequency.
    Type: Grant
    Filed: September 25, 1981
    Date of Patent: August 23, 1983
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Michael R. Daniel, John D. Adam, Robert A. Moore
  • Patent number: 4395686
    Abstract: A magnetostatic wave device is described incorporating a plurality of resistive strips spaced apart from one another and transverse to the propagation path of magnetostatic waves in a material such as a YIG film having a finite width for attenuating selected higher order modes of propagating magnetostatic waves.
    Type: Grant
    Filed: October 2, 1981
    Date of Patent: July 26, 1983
    Assignee: Westinghouse Electric Corp.
    Inventor: John D. Adam
  • Patent number: 4349794
    Abstract: Acoustic wave devices employing shallow bulk acoustic waves rather than surface acoustic waves, to provide higher frequencies of operation and other significant advantages, such as less susceptibility to aging and less sensitivity to surface contamination. In each embodiment of the invention, a transmitting transducer and a receiving transducer are oriented on the surface of an anisotropic piezoelectric crystal to achieve substantial coupling of shallow bulk acoustic waves and essentially zero coupling of surface acoustic waves. In one embodiment of the invention, various types of grating filters utilize shallow bulk acoustic waves, and a set of parallel mechanical or electrical discontinuities at or near the surface of the crystal provide reflection of acoustic energy at a frequency determined by the spacing of the discontinuities. Uniformly spaced gratings provide bandpass filter operation, and gratings with graduated spacings provide for frequency compression or expansion.
    Type: Grant
    Filed: October 24, 1978
    Date of Patent: September 14, 1982
    Assignee: TRW Inc.
    Inventors: Reynold S. Kagiwada, Kuo-Hsiung Yen, Ke-Li Wang, Kei F. Lau, Donald L. Lochhead, James A. Leaverton
  • Patent number: 4328472
    Abstract: An acoustic guided wave device has a wave guiding volume (20) which may include transducer elements (22-25) and other metal elements (26), sandwiched between two acoustic half spaces (10, 12) having acoustic velocity faster than the effective acoustic velocity of the material within the wave guiding volume.
    Type: Grant
    Filed: November 3, 1980
    Date of Patent: May 4, 1982
    Assignee: United Technologies Corporation
    Inventor: Thomas W. Grudkowski
  • Patent number: 4290033
    Abstract: Energy trapping elements for use with shallow bulk acoustic wave devices of various kinds, to minimize the insertion loses in such devices due to spreading of electroacoustic energy into the crystal substrate upon which the devices are constructed. Electroacoustic energy propagated in a substrate is trapped close to the surface of the substrate by means of trapping elements comprising a plurality of strips or grooves disposed on the surface of the substrate in the path of the propagated energy, and oriented approximately perpendicularly to the direction of propagation. The spacing of the elements is such that their stop-band frequency, at which energy will be reflected, is substantially different from the characteristic center frequency of the entire device, in order that the elements will serve a purely trapping function and not a reflecting function.
    Type: Grant
    Filed: June 4, 1979
    Date of Patent: September 15, 1981
    Assignee: TRW Inc.
    Inventors: Reynold S. Kagiwada, Kuo-hsiung Yen, Kei-fung Lau
  • Patent number: 4264882
    Abstract: An electric signal transmission transducer employing a ferromagnetic amorphous ribbon and especially an electric signal transmission element and system and an electroacoustic signal conversion system using a ferromagnetic amorphous ribbon. The transmission transducer also provides for applying a magnetic field to the ferromagnetic amorphous ribbon for controlling the electric signal transmission or delay time. Also shown are the electric and magnetic characteristics of ferromagnetic amorphous ribbons after various heat treatments in various magnetic fields.
    Type: Grant
    Filed: March 11, 1977
    Date of Patent: April 28, 1981
    Assignee: Research Development Corporation of Japan
    Inventors: Noboru Tsuya, Kenichi Arai, Hiroshi Shimizu, Tsuyoshi Masumoto
  • Patent number: 4259649
    Abstract: An electroacoustic apparatus is disclosed for providing beam steered and focused compressional or shear waves, using an interdigital generating grid operative with one surface of a piezoelectric delay line member. The generating transducer is provided with electrode elements having a variable spacing determined by the location of a receiving transducer on another surface of the delay line. The electrode elements are energized in a predetermined phase relationship by an input signal. The apparatus is suitable for use to process signals as a pulse compression or pulse expansion dispersive delay line.
    Type: Grant
    Filed: July 26, 1979
    Date of Patent: March 31, 1981
    Assignee: Westinghouse Electric Corp.
    Inventor: John de Klerk
  • Patent number: 4204178
    Abstract: An acoustic surface wave device employs a substrate structurally orientated to enhance the propagation of acoustic surface skimming bulk waves. Multiple reflections from opposed end faces of the substrate establish an acoustic surface skimming bulk standing wave at a predetermined frequency. An interdigital transducer couples to the standing wave. A plurality of devices may be intercoupled to provide a bandpass filter.
    Type: Grant
    Filed: March 31, 1978
    Date of Patent: May 20, 1980
    Assignee: U.S. Philips Corporation
    Inventor: Richard F. Mitchell
  • Patent number: 4165498
    Abstract: A variable delay device for delaying an electrical signal includes a bar-shaped magnetostrictive member to be a transmitting path of a supersonic wave, an input transducer for converting an electric signal into a supersonic wave and an output transducer for converting a supersonic wave into an electric signal, the input and output transducers being provided at at opposite end portions of the magnetostrictive member, and a magnetic field producing device provided between the input and output transducers for supplying the magnetostrictive member with a magnetic field which varies in intensity along the elongated direction of the magnetostrictive member. The magnetic field supplied to the magnetostrictive member is controlled by a control signal applied to the magnetic field producing device to vary the Young's modulus of the magnetostrictive member. As a result, the velocity of the supersonic wave being transmitted therein is varied, to thereby control the delay time of the electric signal.
    Type: Grant
    Filed: January 24, 1978
    Date of Patent: August 21, 1979
    Assignee: Sony Corporation
    Inventor: Masayuki Hongu