GB2214020B - Improvements in or relating to acoustic devices - Google Patents

Improvements in or relating to acoustic devices

Info

Publication number
GB2214020B
GB2214020B GB8729310A GB8729310A GB2214020B GB 2214020 B GB2214020 B GB 2214020B GB 8729310 A GB8729310 A GB 8729310A GB 8729310 A GB8729310 A GB 8729310A GB 2214020 B GB2214020 B GB 2214020B
Authority
GB
United Kingdom
Prior art keywords
relating
acoustic devices
acoustic
devices
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 - Lifetime
Application number
GB8729310A
Other versions
GB2214020A (en
GB8729310D0 (en
Inventor
Frederick Huang
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.)
Thorn EMI PLC
Original Assignee
Thorn EMI 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 Thorn EMI PLC filed Critical Thorn EMI PLC
Priority to GB8729310A priority Critical patent/GB2214020B/en
Publication of GB8729310D0 publication Critical patent/GB8729310D0/en
Publication of GB2214020A publication Critical patent/GB2214020A/en
Application granted granted Critical
Publication of GB2214020B publication Critical patent/GB2214020B/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H03H9/30—Time-delay networks
    • H03H9/42—Time-delay networks using surface acoustic waves
    • H03H9/44—Frequency dependent delay lines, e.g. dispersive delay lines
    • 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
    • H03H9/02803—Weighted reflective structures
    • H03H9/02811—Chirped reflective or coupling arrays
    • 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
    • H03H9/125—Driving means, e.g. electrodes, coils
    • H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
    • H03H9/14538—Formation

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Transducers For Ultrasonic Waves (AREA)
GB8729310A 1987-12-16 1987-12-16 Improvements in or relating to acoustic devices Expired - Lifetime GB2214020B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8729310A GB2214020B (en) 1987-12-16 1987-12-16 Improvements in or relating to acoustic devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8729310A GB2214020B (en) 1987-12-16 1987-12-16 Improvements in or relating to acoustic devices

Publications (3)

Publication Number Publication Date
GB8729310D0 GB8729310D0 (en) 1988-01-27
GB2214020A GB2214020A (en) 1989-08-23
GB2214020B true GB2214020B (en) 1991-10-30

Family

ID=10628563

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8729310A Expired - Lifetime GB2214020B (en) 1987-12-16 1987-12-16 Improvements in or relating to acoustic devices

Country Status (1)

Country Link
GB (1) GB2214020B (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1489265A (en) * 1975-01-03 1977-10-19 Raytheon Co Temperature compensated surface acoustic wave devices
EP0106199A2 (en) * 1982-09-23 1984-04-25 Siemens Aktiengesellschaft Surface-acoustic wave filter and method of producing an absorbing layer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1489265A (en) * 1975-01-03 1977-10-19 Raytheon Co Temperature compensated surface acoustic wave devices
EP0106199A2 (en) * 1982-09-23 1984-04-25 Siemens Aktiengesellschaft Surface-acoustic wave filter and method of producing an absorbing layer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
EP0106199 A2 is equivalent to US4575653 *

Also Published As

Publication number Publication date
GB2214020A (en) 1989-08-23
GB8729310D0 (en) 1988-01-27

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19921216