GB535525A - Improvements in or relating to electromechanical wave filters - Google Patents

Improvements in or relating to electromechanical wave filters

Info

Publication number
GB535525A
GB535525A GB6171/40A GB617140A GB535525A GB 535525 A GB535525 A GB 535525A GB 6171/40 A GB6171/40 A GB 6171/40A GB 617140 A GB617140 A GB 617140A GB 535525 A GB535525 A GB 535525A
Authority
GB
United Kingdom
Prior art keywords
electromechanical
pair
bar
inductances
tube
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
GB6171/40A
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 GB535525A publication Critical patent/GB535525A/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
    • H03H9/48—Coupling means therefor
    • H03H9/52—Electric coupling means

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)

Abstract

535,525. Electromechanical wave filters. STANDARD TELEPHONES & CABLES, Ltd. April 5, 1940, No. 6171. Convention date, July 19, 1939. [Class 40 (iii)] An electromechanical wave filter comprises a metallic bar or tube 11 and two pairs of piezo-electric plates, one pair 12, 13 for producing vibrations which are picked up by the other pair 16, 17. The bar may be mounted at the centre on a comer so that the mounting does not interfere with the crystals which are disposed centrally with respect to the length of the bar or tube. The electromechanical filter may form the series arms of a bridged-T wave filter, the input terminal 1 being connected to one pair of plates 12, 13, the output terminal 3 to the other pair 16, 17, and the terminals 2, 4 to the bar or tube 11. Shunt condensers Cl are arranged as shown, and inductances L1 in series as shown or in parallel, Fig. 7 (not shown). Two electromechanical filters may be connected in parallel Figs. 8 and 9 (not shown). The inductances L1 may be inductively coupled. The attenuation peaks are determined by the poling of the piezoelectric plates and by the coupling between inductances L1.
GB6171/40A 1939-07-19 1940-04-05 Improvements in or relating to electromechanical wave filters Expired GB535525A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US285237A US2271200A (en) 1939-07-19 1939-07-19 Wave filter

Publications (1)

Publication Number Publication Date
GB535525A true GB535525A (en) 1941-04-11

Family

ID=23093376

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6171/40A Expired GB535525A (en) 1939-07-19 1940-04-05 Improvements in or relating to electromechanical wave filters

Country Status (3)

Country Link
US (1) US2271200A (en)
FR (1) FR867291A (en)
GB (1) GB535525A (en)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2470133A (en) * 1946-12-16 1949-05-17 Gasket Engineering Co Inc Multiple crystal holder
US2733423A (en) * 1951-03-06 1956-01-31 Ceramic transducers having annular elements
US2744197A (en) * 1951-05-09 1956-05-01 Globe Union Inc Frequency stabilization
DE1234276B (en) * 1954-06-29 1967-02-16 Gen Electric Piezoelectric transformation arrangement with an oscillating body made of pre-polarized ferroelectric material
US2830204A (en) * 1955-07-01 1958-04-08 Harris Transducer Corp Linear mechanical oscillator circuit element transducer
NL236717A (en) * 1958-03-03
DE1221738B (en) * 1960-02-26 1966-07-28 Siemens Ag Electromechanical filter
BE622703A (en) * 1961-09-22
US3614485A (en) * 1969-08-05 1971-10-19 Austron Inc Electromechanical reed system
JPS5134177Y1 (en) * 1969-09-30 1976-08-24
US3578994A (en) * 1969-10-22 1971-05-18 Dynamics Corp Massa Div Piezoelectric clamped-free beam type transducer
US3651352A (en) * 1970-12-10 1972-03-21 Branson Instr Oscillatory circuit for ultrasonic cleaning apparatus
US5493166A (en) * 1988-08-12 1996-02-20 Murata Manufacturing Co., Ltd. Vibrator and vibrating gyroscope using the same
US5874674A (en) * 1988-08-12 1999-02-23 Murata Manufacturing Co., Ltd. Vibrator including piezoelectric electrodes or detectors arranged to be non-parallel and non-perpendicular to coriolis force direction and vibratory gyroscope using the same
DE69310799T2 (en) * 1992-03-30 1997-11-13 Murata Manufacturing Co Vibrator with balanced edge areas
JP3206299B2 (en) * 1994-04-26 2001-09-10 株式会社村田製作所 Piezoelectric vibrator
JPH08278146A (en) * 1995-04-03 1996-10-22 Murata Mfg Co Ltd Vibrating gyro
JPH11344341A (en) * 1998-05-29 1999-12-14 Tokai Rika Co Ltd Parallel flat plate vibration gyro and parallel flat plate vibration gyro device
KR100704990B1 (en) * 2005-08-08 2007-04-10 삼성전기주식회사 A stator and ceramic tube type ultrasonic motor using the same
US8519598B1 (en) * 2010-11-01 2013-08-27 Georgia Tech Research Corporation Microelectromechanical resonators having piezoelectric layers therein that support actuation and sensing through a longitudinal piezoelectric effect

Also Published As

Publication number Publication date
US2271200A (en) 1942-01-27
FR867291A (en) 1941-10-10

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