GB303180A - Improvements in filter circuit arrangements comprising piezo crystals - Google Patents

Improvements in filter circuit arrangements comprising piezo crystals

Info

Publication number
GB303180A
GB303180A GB38417/28A GB3841728A GB303180A GB 303180 A GB303180 A GB 303180A GB 38417/28 A GB38417/28 A GB 38417/28A GB 3841728 A GB3841728 A GB 3841728A GB 303180 A GB303180 A GB 303180A
Authority
GB
United Kingdom
Prior art keywords
filter
filter circuit
circuit arrangements
piezo crystals
piezo
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
GB38417/28A
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
Publication of GB303180A publication Critical patent/GB303180A/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
    • H03H9/46—Filters
    • H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
    • H03H9/545—Filters comprising resonators of piezoelectric or electrostrictive material including active elements

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)

Abstract

303,180. Standard Telephones & Cables, Ltd., (Assignees of Fetter, C. H.). Dec. 29, 1927, [Convention date]. Thermionic amplifiers; filter circuits.-A filter comprises a plurality of piezo-electric crystals and impedances co-operating therewith so arranged as to produce a flat transmission characteristic and a sharp cut-off. The Figure shows the application to the input of a valve V of a filter tunable to three frequency bands by switches S1, S2. In a modification (Fig. 3, not shown) a similar filter is employed after the intermediate-frequency amplifier of a supersonic heterodyne receiver.
GB38417/28A 1927-12-29 1928-12-29 Improvements in filter circuit arrangements comprising piezo crystals Expired GB303180A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US243388A US1851091A (en) 1927-12-29 1927-12-29 Signaling system including adjustable wave filter

Publications (1)

Publication Number Publication Date
GB303180A true GB303180A (en) 1929-05-30

Family

ID=22918579

Family Applications (1)

Application Number Title Priority Date Filing Date
GB38417/28A Expired GB303180A (en) 1927-12-29 1928-12-29 Improvements in filter circuit arrangements comprising piezo crystals

Country Status (3)

Country Link
US (1) US1851091A (en)
FR (1) FR662743A (en)
GB (1) GB303180A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB656130A (en) * 1948-10-08 1951-08-15 Decca Record Co Ltd Improvements in or relating to receiving apparatus for radio navigational systems
US2839732A (en) * 1955-01-31 1958-06-17 Rca Corp Single-sideband filter
US3019335A (en) * 1959-09-14 1962-01-30 Nat Company Inc Large bandwidth low noise antenna circuit
US3054968A (en) * 1960-07-13 1962-09-18 Gen Dynamics Corp Crystal filters for multifrequency source

Also Published As

Publication number Publication date
FR662743A (en) 1929-08-10
US1851091A (en) 1932-03-29

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