GB537803A - Electric wave filters - Google Patents

Electric wave filters

Info

Publication number
GB537803A
GB537803A GB9184/40A GB918440A GB537803A GB 537803 A GB537803 A GB 537803A GB 9184/40 A GB9184/40 A GB 9184/40A GB 918440 A GB918440 A GB 918440A GB 537803 A GB537803 A GB 537803A
Authority
GB
United Kingdom
Prior art keywords
band
pair
resonant frequency
pass
electric wave
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
GB9184/40A
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 GB537803A publication Critical patent/GB537803A/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)
  • Filters And Equalizers (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)

Abstract

537,803. Filter networks. STANDARD TELEPHONES & CABLES, Ltd. May 24,1940, No. 9184. Convention date, Aug. 8, 1939. [Class 40 (iii)] Band-pass intermediate-frequency filters for wireless sets comprise a pair of inductively coupled antiresonant circuits 22 and in parallel or in series therewith a pair of piezo-electric transformers 23, 33 having resonance frequencies respectively lower than the lower resonant frequency and higher than the higher resonant frequency of the coupled circuits. The resulting filter has a pass-band of 8-9 kilocycles with a sharp cut-off. A mathematical discussion is given to enable the dimensions of the components. to be selected.
GB9184/40A 1939-08-08 1940-05-24 Electric wave filters Expired GB537803A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR861831T 1939-08-08

Publications (1)

Publication Number Publication Date
GB537803A true GB537803A (en) 1941-07-07

Family

ID=9342393

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9184/40A Expired GB537803A (en) 1939-08-08 1940-05-24 Electric wave filters

Country Status (3)

Country Link
US (1) US2640879A (en)
FR (1) FR861831A (en)
GB (1) GB537803A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2640879A (en) * 1939-08-08 1953-06-02 Int Standard Electric Corp Band pass filter

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3179906A (en) * 1965-04-20 By-pass netwoems when
US3437848A (en) * 1964-09-24 1969-04-08 Telefunken Patent Piezoelectric plate filter

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1438828A (en) * 1920-03-29 1922-12-12 Harry W Houck Method and apparatus for selectively transferring electrical oscillatory energy
US1732710A (en) * 1923-09-20 1929-10-22 Westinghouse Electric & Mfg Co Wireless receiving system
FR796611A (en) * 1935-01-07 1936-04-11 Materiel Telephonique Improvements to electric wave filters
US2204702A (en) * 1936-04-29 1940-06-18 Rca Corp Piezoelectric crystal filter with inductive shunt
US2248776A (en) * 1938-07-28 1941-07-08 Bell Telephone Labor Inc Wave filter
FR861831A (en) * 1939-08-08 1941-02-18 Materiel Telephonique Electric wave filters

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2640879A (en) * 1939-08-08 1953-06-02 Int Standard Electric Corp Band pass filter

Also Published As

Publication number Publication date
FR861831A (en) 1941-02-18
US2640879A (en) 1953-06-02

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