GB530957A - Piezoelectric crystal impedance element - Google Patents

Piezoelectric crystal impedance element

Info

Publication number
GB530957A
GB530957A GB19842/39A GB1984239A GB530957A GB 530957 A GB530957 A GB 530957A GB 19842/39 A GB19842/39 A GB 19842/39A GB 1984239 A GB1984239 A GB 1984239A GB 530957 A GB530957 A GB 530957A
Authority
GB
United Kingdom
Prior art keywords
electrodes
crystal
electrode
series
terminals
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
GB19842/39A
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 GB530957A publication Critical patent/GB530957A/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
    • H03H9/0023—Balance-unbalance or balance-balance networks
    • H03H9/0095—Balance-unbalance or balance-balance networks using bulk acoustic wave devices
    • 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
    • H03H9/542—Filters comprising resonators of piezoelectric or electrostrictive material including passive elements
    • 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
    • H03H9/56—Monolithic crystal filters
    • H03H9/566—Electric coupling means therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/42—Piezoelectric device making

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)

Abstract

530,957. Piezo-electric crystals ; impedance networks. STANDARD TELEPHONES & CABLES, Ltd. July 7, 1939, No. 19842. Convention date, Sept. 3, 1938. [Classes 40 (iii) and 40 (v)] The impedance of a piezo-electric crystal is increased by subdividing the electrodes and interconnecting the divisions in such a way that different parts of the crystal are connected in series or series-parallel combinations. Fig. 5 shows an arrangement in which each electrode is divided into three parts A, B, C, A<SP>1</SP>, B<SP>1</SP>, C<SP>1</SP>, the parts AA<SP>1</SP> and CC<SP>1</SP> being series-connected in parallel into part BB<SP>1</SP> relative to terminals 4, 5. The actual layout of the electrodes is shown in Fig. 8 which is a developed view in which 8, 9 are the centre lines of the upper and lower faces of the crystal and 10, 11, 12 and 13 are the edges. Electrodes A and B are combined to form electrode D while B<SP>1</SP> and C<SP>1</SP> are combined to form electrode E. Electrodes C and A<SP>1</SP> are connected by strips of plating 14, 15 on the sides of the crystal. Fig. 9 shows the arrangement of Fig. 8 modified to provide two impedances by dividing the electrodes along the centre lines 8, 9, two pairs of terminals 16, 17 and 18, 19 being provided. Electrode arrangements for series connection, and for working on the higher harmonics are also described. Fig. 14 shows a wave filter of the symmetrical lattice type comprising two equal length impedance branches and two equal diagonal branches connected between input terminals 24, 25 and output terminals 26, 27. The two pairs of equal impedances 28, 29 and 30, 31 may be furnished by two single crystals each having the electrode layout of Fig. 9.
GB19842/39A 1938-09-03 1939-07-07 Piezoelectric crystal impedance element Expired GB530957A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US228355A US2194539A (en) 1938-09-03 1938-09-03 Piezoelectric crystal impedance element

Publications (1)

Publication Number Publication Date
GB530957A true GB530957A (en) 1940-12-24

Family

ID=22856848

Family Applications (1)

Application Number Title Priority Date Filing Date
GB19842/39A Expired GB530957A (en) 1938-09-03 1939-07-07 Piezoelectric crystal impedance element

Country Status (3)

Country Link
US (1) US2194539A (en)
FR (1) FR858577A (en)
GB (1) GB530957A (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2653547A (en) * 1947-03-01 1953-09-29 Borg Warner Hydrodynamic coupling
US2763050A (en) * 1950-01-06 1956-09-18 Bell Telephone Labor Inc Crystal unit inductance adjustment
US3437848A (en) * 1964-09-24 1969-04-08 Telefunken Patent Piezoelectric plate filter
AT320794B (en) * 1970-09-11 1975-02-25 Braun Ag Dt PIEZOELECTRIC DRIVE
US4129799A (en) * 1975-12-24 1978-12-12 Sri International Phase reversal ultrasonic zone plate transducer
US4365182A (en) * 1980-10-14 1982-12-21 The United States Of America As Represented By The Secretary Of The Army Method of fabricating acceleration resistant crystal resonators and acceleration resistant crystal resonators so formed
CH641632B (en) * 1981-01-15 Asulab Sa PIEZO-ELECTRIC MICRO-RESONATOR.
US5371430A (en) * 1991-02-12 1994-12-06 Fujitsu Limited Piezoelectric transformer producing an output A.C. voltage with reduced distortion
US5294898A (en) * 1992-01-29 1994-03-15 Motorola, Inc. Wide bandwidth bandpass filter comprising parallel connected piezoelectric resonators

Also Published As

Publication number Publication date
FR858577A (en) 1940-11-28
US2194539A (en) 1940-03-26

Similar Documents

Publication Publication Date Title
GB530957A (en) Piezoelectric crystal impedance element
GB542452A (en) Wave transmission networks
GB535525A (en) Improvements in or relating to electromechanical wave filters
GB540024A (en) Improvements in electro-mechanical tuned couplings or frequency filters
GB538674A (en) Improvements in electrical oscillators comprising thermionic valves
GB646564A (en) Lattice electrical network
GB533171A (en) Wave filter
US2429639A (en) Wave filter
DE861865C (en) Transmitting device with two energy sources
GB547357A (en) Wave filter
GB534176A (en) Modifying networks for the transmission of high frequency currents
GB477019A (en) Improvements relating to electrical conductors
GB928955A (en) Improvements in or relating to electric filter networks
GB364561A (en) Improvements in or relating to wave filters
GB538946A (en) Improvements in electric filter circuits
GB534107A (en) Improvements in or relating to filter networks
GB723985A (en) Symmetrical lattice-type four-terminal networks
GB528403A (en) Improvements in or relating to electrical filter circuits
GB642691A (en) Improvements in or relating to electric wave filters
GB570043A (en) Improvements in means for reducing surface leakage in high-impedance alternating current generators
AU110836B2 (en) Improvements in or relating to electrical filters and impedance transforming networks
JPS5520014A (en) 4-terminal type ceramic filter
AU20739A (en) Improvements in or relating to electrical filters and impedance transforming networks
GB594520A (en) Electric wave filters
GB529131A (en) Improvements in or relating to electrical filters of the piezo electric crystal type