GB2006565A - Crystal filter networks - Google Patents

Crystal filter networks

Info

Publication number
GB2006565A
GB2006565A GB7833597A GB7833597A GB2006565A GB 2006565 A GB2006565 A GB 2006565A GB 7833597 A GB7833597 A GB 7833597A GB 7833597 A GB7833597 A GB 7833597A GB 2006565 A GB2006565 A GB 2006565A
Authority
GB
United Kingdom
Prior art keywords
crystal filter
crystal
capacitor
filter networks
series
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.)
Granted
Application number
GB7833597A
Other versions
GB2006565B (en
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.)
Siemens Telefongyar Kft
Original Assignee
Siemens Telefongyar Kft
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 Siemens Telefongyar Kft filed Critical Siemens Telefongyar Kft
Publication of GB2006565A publication Critical patent/GB2006565A/en
Application granted granted Critical
Publication of GB2006565B publication Critical patent/GB2006565B/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 piezo-electric or electrostrictive material
    • H03H9/542—Filters comprising resonators of piezo-electric or electrostrictive material including passive elements

Abstract

The invention concerns a narrow- band bridge-connected crystal filter having a tunable input transformer the secondary of which is centre-tapped. One end of the secondary is connected to the branch of the bridge containing the crystal connected in series with a capacitor. The bandwidth of the transformer is at least 20 times the design bandwidth of the crystal filter. The series-connected crystal and capacitor are shunted by a fixed and a variable capacitor connected in parallel with each other. <IMAGE>
GB7833597A 1977-08-29 1978-08-16 Narrow band bridge-connected crystal band filter Expired GB2006565B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
HU77TE886A HU176718B (en) 1977-08-29 1977-08-29 Bridge crystal band-pass filter of narrow-band

Publications (2)

Publication Number Publication Date
GB2006565A true GB2006565A (en) 1979-05-02
GB2006565B GB2006565B (en) 1982-01-27

Family

ID=11002078

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7833597A Expired GB2006565B (en) 1977-08-29 1978-08-16 Narrow band bridge-connected crystal band filter

Country Status (7)

Country Link
CS (1) CS216845B2 (en)
DD (1) DD138399A5 (en)
DE (1) DE2836563A1 (en)
GB (1) GB2006565B (en)
HU (1) HU176718B (en)
PL (1) PL121976B1 (en)
SE (1) SE7809045L (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2006564B (en) * 1977-08-30 1982-03-24 Telefongyar Process for the assembly and adjustment of a narrow band bridge-connected crystal band filter

Also Published As

Publication number Publication date
HU176718B (en) 1981-04-28
GB2006565B (en) 1982-01-27
DE2836563A1 (en) 1979-03-08
CS216845B2 (en) 1982-11-26
PL209269A1 (en) 1979-07-16
PL121976B1 (en) 1982-06-30
SE7809045L (en) 1979-03-01
DD138399A5 (en) 1979-10-24

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Legal Events

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