GB1491250A - Elastic surface wave device - Google Patents

Elastic surface wave device

Info

Publication number
GB1491250A
GB1491250A GB56006/74A GB5600674A GB1491250A GB 1491250 A GB1491250 A GB 1491250A GB 56006/74 A GB56006/74 A GB 56006/74A GB 5600674 A GB5600674 A GB 5600674A GB 1491250 A GB1491250 A GB 1491250A
Authority
GB
United Kingdom
Prior art keywords
cut
surface wave
angle
dec
degrees
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
GB56006/74A
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.)
Nihon Dempa Kogyo Co Ltd
Original Assignee
Nihon Dempa Kogyo Co Ltd
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 Nihon Dempa Kogyo Co Ltd filed Critical Nihon Dempa Kogyo Co Ltd
Publication of GB1491250A publication Critical patent/GB1491250A/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
    • H03H9/02—Details
    • H03H9/02535—Details of surface acoustic wave devices
    • H03H9/02543—Characteristics of substrate, e.g. cutting angles
    • H03H9/02559—Characteristics of substrate, e.g. cutting angles of lithium niobate or lithium-tantalate substrates
    • 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
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G7/00—Capacitors in which the capacitance is varied by non-mechanical means; Processes of their manufacture
    • H01G7/02—Electrets, i.e. having a permanently-polarised dielectric
    • H01G7/025—Electrets, i.e. having a permanently-polarised dielectric having an inorganic dielectric

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Multimedia (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)

Abstract

1491250 Surface wave devices NIHON DEMPA KOGYO CO Ltd 30 Dec 1974 [28 Dec 1973] 56006/74 Heading H3U [Also in Division H1] A lithium niobate plate, for use as a piezoelectric substrate in an elastic surface wave device providing a filter or delay line in VHF/UHF bands, is formed as a Y-cut single crystal rotated about the X-axis by an angle lying in the range 125À6 to 130À1 degrees. Where interdigital electrodes of uniform overlap are formed on the surface of the plate, a cutting angle in this range reduces the ratio of spurious component shear waves to the Rayleigh surface waves to at least 40 dB. An angle of cut of 127À86 degrees suppresses spurious components better than 65 dB, Fig. 4. Suppression may also be achieved with devices having non-uniform electrode overlap using the stated angles of cut.
GB56006/74A 1973-12-28 1974-12-30 Elastic surface wave device Expired GB1491250A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP49000846A JPS5099289A (en) 1973-12-28 1973-12-28

Publications (1)

Publication Number Publication Date
GB1491250A true GB1491250A (en) 1977-11-09

Family

ID=11484988

Family Applications (1)

Application Number Title Priority Date Filing Date
GB56006/74A Expired GB1491250A (en) 1973-12-28 1974-12-30 Elastic surface wave device

Country Status (4)

Country Link
JP (1) JPS5099289A (en)
DE (1) DE2461664C2 (en)
GB (1) GB1491250A (en)
NL (1) NL179326C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2491697A1 (en) * 1980-10-08 1982-04-09 Philips Nv SURFACE ACOUSTIC WAVE FILTERS
CN109150128A (en) * 2017-06-27 2019-01-04 日本电波工业株式会社 Surface acoustic wave device and its manufacturing method

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1089544A (en) * 1976-11-09 1980-11-11 Sadao Takahashi Elastic surface wave device
JPS53139951A (en) * 1977-05-13 1978-12-06 Fujitsu Ltd Element for elastic surface wave
DE3818537A1 (en) * 1988-05-31 1989-12-07 Siemens Ag LITHIUM NITROBATE CRYSTALS OF CONGRUNENT COMPOSITION, ESPECIALLY FOR SURFACE WAVE ARRANGEMENTS, AND METHOD FOR THE PRODUCTION THEREOF

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3680009A (en) * 1971-03-18 1972-07-25 Us Air Force Acoustic surface wave delay line

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2491697A1 (en) * 1980-10-08 1982-04-09 Philips Nv SURFACE ACOUSTIC WAVE FILTERS
CN109150128A (en) * 2017-06-27 2019-01-04 日本电波工业株式会社 Surface acoustic wave device and its manufacturing method
CN109150128B (en) * 2017-06-27 2023-08-18 Ndk声表滤波器股份有限公司 Surface acoustic wave element and method for manufacturing the same

Also Published As

Publication number Publication date
JPS5099289A (en) 1975-08-06
NL179326C (en) 1986-08-18
NL7416981A (en) 1975-07-01
NL179326B (en) 1986-03-17
DE2461664A1 (en) 1975-07-03
DE2461664C2 (en) 1984-07-12

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19941229