GB1364894A - Surface elastic wave devices - Google Patents

Surface elastic wave devices

Info

Publication number
GB1364894A
GB1364894A GB4559471A GB4559471A GB1364894A GB 1364894 A GB1364894 A GB 1364894A GB 4559471 A GB4559471 A GB 4559471A GB 4559471 A GB4559471 A GB 4559471A GB 1364894 A GB1364894 A GB 1364894A
Authority
GB
United Kingdom
Prior art keywords
film
magnetic field
transducer
elastic
waves
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4559471A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB4559471A priority Critical patent/GB1364894A/en
Publication of GB1364894A publication Critical patent/GB1364894A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/36—Devices for manipulating acoustic surface waves
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/02535—Details of surface acoustic wave devices
    • H03H9/02543—Characteristics of substrate, e.g. cutting angles
    • H03H9/02574—Characteristics of substrate, e.g. cutting angles of combined substrates, multilayered substrates, piezoelectrical layers on not-piezoelectrical substrate

Abstract

1364894 Surface wave devices GENERAL ELECTRIC CO Ltd 11 Sept 1972 [30 Sept 1971] 45594/71 Heading H3U A surface elastic wave device includes a ferromagnetic or ferrimagnetic film 2 having magnetoelastic and/or elastic anisotropy and traversed by a magnetic field in the direction 8. Consequently the surface waves from transducer 4 to transducer 5 are more greatly attenuated than those following the reciprocal path 5#4, and the effect is used to form delay lines, filters, or u.h.f. isolating devices immunized against the deleterious effects of surface wave reflections from the output to the input transducer, or from the edges of the device. Reversal of the magnetic field reverses the sense of the most attenuated path. Construction.-A base 1 of non-magnetic crystalline gadolinium gallium garnet supports ferromagnetic film 2 of yttrium-iron-garnet, formed epitaxially, doped with gallium if required to reduce the saturation magnetization, having isotropic elastic and anisotropic magnetoelastic properties, and disclosed crystal orientation with respect to the device as a whole. The film 2 supports acoustic surface waves, interdigitated metal film electrodes 4, 5 being supported on zinc oxide piezoelectric layer 3, provided all over film 2, or adjacent the transducers only. The magnetic field may be provided by a permanent, or electromagnet, or may be provided by the film 2 itself. Dimensions are given for a 200 MHz operating frequency. The attenuation effect may be due to the interaction of the surface wave with either bulk or surface spin waves.
GB4559471A 1972-09-11 1972-09-11 Surface elastic wave devices Expired GB1364894A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4559471A GB1364894A (en) 1972-09-11 1972-09-11 Surface elastic wave devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4559471A GB1364894A (en) 1972-09-11 1972-09-11 Surface elastic wave devices

Publications (1)

Publication Number Publication Date
GB1364894A true GB1364894A (en) 1974-08-29

Family

ID=10437806

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4559471A Expired GB1364894A (en) 1972-09-11 1972-09-11 Surface elastic wave devices

Country Status (1)

Country Link
GB (1) GB1364894A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4199737A (en) * 1978-10-18 1980-04-22 Westinghouse Electric Corp. Magnetostatic wave device
US4209759A (en) * 1977-10-25 1980-06-24 Thomson-Csf Magnetoelastic surface wave interaction device
GB2206256A (en) * 1987-05-26 1988-12-29 Clarion Co Ltd Surface acoustic wave device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4209759A (en) * 1977-10-25 1980-06-24 Thomson-Csf Magnetoelastic surface wave interaction device
US4199737A (en) * 1978-10-18 1980-04-22 Westinghouse Electric Corp. Magnetostatic wave device
GB2206256A (en) * 1987-05-26 1988-12-29 Clarion Co Ltd Surface acoustic wave device

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees