FR2360212A1 - Electromechanical filter element coupling - includes quarter wave quartz elements to reduce parasitic resonance outside passband by eight five db - Google Patents

Electromechanical filter element coupling - includes quarter wave quartz elements to reduce parasitic resonance outside passband by eight five db

Info

Publication number
FR2360212A1
FR2360212A1 FR7622684A FR7622684A FR2360212A1 FR 2360212 A1 FR2360212 A1 FR 2360212A1 FR 7622684 A FR7622684 A FR 7622684A FR 7622684 A FR7622684 A FR 7622684A FR 2360212 A1 FR2360212 A1 FR 2360212A1
Authority
FR
France
Prior art keywords
quarter wave
mode
filter element
coupling
parasitic resonance
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
FR7622684A
Other languages
French (fr)
Other versions
FR2360212B1 (en
Inventor
Herbert Ernyei
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.)
Lignes Telegraphiques et Telephoniques LTT SA
Original Assignee
Lignes Telegraphiques et Telephoniques LTT SA
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 Lignes Telegraphiques et Telephoniques LTT SA filed Critical Lignes Telegraphiques et Telephoniques LTT SA
Priority to FR7622684A priority Critical patent/FR2360212A1/en
Publication of FR2360212A1 publication Critical patent/FR2360212A1/en
Application granted granted Critical
Publication of FR2360212B1 publication Critical patent/FR2360212B1/fr
Granted 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
    • H03H9/48—Coupling means therefor
    • H03H9/50—Mechanical coupling means

Abstract

Coupling arrangement for electro-mechanical elements that are employed in the longitudinal vibration mode. Coupling is via intermediate elements operating partly in the bending mode and minimises parasitic resonance outside the filter pass-band. The technique being esp. suitable for use in telephone exchange equipment. The coupling point can be attached at the node points of the most troublesome parasitic oscillations. The complete structure is mounted within two quarter wave quartz elements operating in the bending mode, the connection point being at the node point of the second mode oscillation. Attenuation outside the pass-band is greater than 85 db between 100 and 150 KHz apart from a very sharp band corresponding to the second operation mode of the resonators.
FR7622684A 1976-07-26 1976-07-26 Electromechanical filter element coupling - includes quarter wave quartz elements to reduce parasitic resonance outside passband by eight five db Granted FR2360212A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7622684A FR2360212A1 (en) 1976-07-26 1976-07-26 Electromechanical filter element coupling - includes quarter wave quartz elements to reduce parasitic resonance outside passband by eight five db

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7622684A FR2360212A1 (en) 1976-07-26 1976-07-26 Electromechanical filter element coupling - includes quarter wave quartz elements to reduce parasitic resonance outside passband by eight five db

Publications (2)

Publication Number Publication Date
FR2360212A1 true FR2360212A1 (en) 1978-02-24
FR2360212B1 FR2360212B1 (en) 1978-12-15

Family

ID=9176118

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7622684A Granted FR2360212A1 (en) 1976-07-26 1976-07-26 Electromechanical filter element coupling - includes quarter wave quartz elements to reduce parasitic resonance outside passband by eight five db

Country Status (1)

Country Link
FR (1) FR2360212A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1191702A (en) * 1957-03-22 1959-10-21 Telefunken Gmbh Mechanical frequency filter
FR1191701A (en) * 1957-03-20 1959-10-21 Telefunken Gmbh Mechanical filter for high frequencies
FR1300076A (en) * 1960-09-21 1962-07-27 Telefunken Gmbh Mechanical band filter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1191701A (en) * 1957-03-20 1959-10-21 Telefunken Gmbh Mechanical filter for high frequencies
FR1191702A (en) * 1957-03-22 1959-10-21 Telefunken Gmbh Mechanical frequency filter
FR1300076A (en) * 1960-09-21 1962-07-27 Telefunken Gmbh Mechanical band filter

Also Published As

Publication number Publication date
FR2360212B1 (en) 1978-12-15

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Legal Events

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