GB1131265A - Improvements in or relating to acoustic wave devices - Google Patents

Improvements in or relating to acoustic wave devices

Info

Publication number
GB1131265A
GB1131265A GB4013066A GB4013066A GB1131265A GB 1131265 A GB1131265 A GB 1131265A GB 4013066 A GB4013066 A GB 4013066A GB 4013066 A GB4013066 A GB 4013066A GB 1131265 A GB1131265 A GB 1131265A
Authority
GB
United Kingdom
Prior art keywords
discontinuity
groove
wave
resonator
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
GB4013066A
Inventor
Eric Albert Ash
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.)
STC PLC
Original Assignee
Standard Telephone and Cables 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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB4013066A priority Critical patent/GB1131265A/en
Priority to FR120422A priority patent/FR1538114A/en
Publication of GB1131265A publication Critical patent/GB1131265A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/74—Multiple-port networks for connecting several sources or loads, working on the same frequency or frequency band, to a common load or source
    • H03H9/76—Networks using surface acoustic waves
    • 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
    • H03H9/02637—Details concerning reflective or coupling arrays
    • H03H9/02653—Grooves or arrays buried in the substrate
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/30—Time-delay networks
    • H03H9/42—Time-delay networks using surface acoustic waves

Abstract

1,131,265. Acoustic wave devices. STANDARD TELEPHONES & CABLES Ltd. 1 Sept., 1967 [8 Sept., 1966; 11 May, 1967], Nos. 40130/66 and 21943/67. Heading H3U. An acoustic wave device for propagating surface waves, i.e. waves having both longitudinal and shear mode components, comprises a body 2 of propagating medium, e.g. yttrium aluminium garnet, having a surface discontinuity to produce reflection of the surface wave without introducing mode conversion. The discontinuity may take the form of one or more slots 1, Fig. 1a, filled with a material 3 of different acoustic impedance. In another embodiment (Fig. lb, not shown) the discontinuity is formed by a semi-circular groove and this groove may be filled with a material of different acoustic impedance (Fig. 1c, not shown). In other embodiments (Figs. 1d, 1e, not shown) the discontinuity is formed by raised lips on the surface of the body 2, which lips may be formed by the material of the body itself or by material of a different acoustic impedance. Applications of the device functioning as a resonator, a filter, a power divider and a directional coupler are described with reference to Figs. 2-5 (not shown). In a further embodiment shown in the drawing filed with Provisional Specification 21943/67, a surface wave transmission path 1 is formed by parallel grooves 3, 4 in a propagating medium 2. The groove 4 has a circular portion 4a with a concentric groove 5 forming a resonator, the circumferential length of the resonator being equal to an integral number of wavelengths of the acoustic surface wave so that a standing wave exists therein. A transducer for imparting surface waves to the propagating medium 2 is described with reference to Fig. 6 (not shown), this transducer comprising evaporated cadmium sulphide layers on the surface of the medium, the layers being arranged in two arrays, one array producing the longitudinal mode components and the other the shear mode components.
GB4013066A 1966-09-08 1966-09-08 Improvements in or relating to acoustic wave devices Expired GB1131265A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB4013066A GB1131265A (en) 1966-09-08 1966-09-08 Improvements in or relating to acoustic wave devices
FR120422A FR1538114A (en) 1966-09-08 1967-09-08 Traveling acoustic wave device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4013066A GB1131265A (en) 1966-09-08 1966-09-08 Improvements in or relating to acoustic wave devices

Publications (1)

Publication Number Publication Date
GB1131265A true GB1131265A (en) 1968-10-23

Family

ID=10413337

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4013066A Expired GB1131265A (en) 1966-09-08 1966-09-08 Improvements in or relating to acoustic wave devices

Country Status (1)

Country Link
GB (1) GB1131265A (en)

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