FR865779A - Improvements to piezoelectric crystal type filters - Google Patents

Improvements to piezoelectric crystal type filters

Info

Publication number
FR865779A
FR865779A FR865779DA FR865779A FR 865779 A FR865779 A FR 865779A FR 865779D A FR865779D A FR 865779DA FR 865779 A FR865779 A FR 865779A
Authority
FR
France
Prior art keywords
piezoelectric crystal
crystal type
type filters
filters
piezoelectric
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
Other languages
French (fr)
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.)
Marconis Wireless Telegraph Co Ltd
Original Assignee
Marconis Wireless Telegraph 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 Marconis Wireless Telegraph Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Application granted granted Critical
Publication of FR865779A publication Critical patent/FR865779A/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
    • H03H9/0023—Balance-unbalance or balance-balance networks
    • H03H9/0095—Balance-unbalance or balance-balance networks using bulk acoustic wave devices
    • 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
    • H03H9/02007—Details of bulk acoustic wave devices
    • H03H9/02157—Dimensional parameters, e.g. ratio between two dimension parameters, length, width or thickness
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
    • H03H9/542—Filters comprising resonators of piezoelectric or electrostrictive material including passive elements

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
FR865779D 1939-05-22 1940-05-22 Improvements to piezoelectric crystal type filters Expired FR865779A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB865779X 1939-05-22

Publications (1)

Publication Number Publication Date
FR865779A true FR865779A (en) 1941-06-03

Family

ID=10609973

Family Applications (1)

Application Number Title Priority Date Filing Date
FR865779D Expired FR865779A (en) 1939-05-22 1940-05-22 Improvements to piezoelectric crystal type filters

Country Status (1)

Country Link
FR (1) FR865779A (en)

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