GB631772A - Improvements in electric wave filters incorporating piezoelectric crystal elements - Google Patents
Improvements in electric wave filters incorporating piezoelectric crystal elementsInfo
- Publication number
- GB631772A GB631772A GB21775/47A GB2177547A GB631772A GB 631772 A GB631772 A GB 631772A GB 21775/47 A GB21775/47 A GB 21775/47A GB 2177547 A GB2177547 A GB 2177547A GB 631772 A GB631772 A GB 631772A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrodes
- odd
- crystal
- shear
- electric
- 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
Links
- 239000013078 crystal Substances 0.000 title abstract 4
- 230000008878 coupling Effects 0.000 abstract 2
- 238000010168 coupling process Methods 0.000 abstract 2
- 238000005859 coupling reaction Methods 0.000 abstract 2
- 239000003990 capacitor Substances 0.000 abstract 1
- 230000005284 excitation Effects 0.000 abstract 1
- 239000010453 quartz Substances 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 1
- 230000001131 transforming effect Effects 0.000 abstract 1
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
- H03H9/58—Multiple crystal filters
- H03H9/60—Electric coupling means therefor
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/05—Holders; Supports
- H03H9/10—Mounting in enclosures
- H03H9/1007—Mounting in enclosures for bulk acoustic wave [BAW] devices
- H03H9/1014—Mounting in enclosures for bulk acoustic wave [BAW] devices the enclosure being defined by a frame built on a substrate and a cap, the frame having no mechanical contact with the BAW device
-
- 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
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
631,772. Impedance networks. WESTERN ELECTRIC CO., Inc. Aug. 7, 1947, No. 21775. Convention date, March 30, 1943. [Class 40 (viii)] [Also in Group XL (c)] A piezo-electric filter comprising an AT cut quartz plate has electrodes arranged and connected as shown in Figs. 8 or 10. The Specification explains in detail with the aid of graphs that this arrangement will vibrate in an odd but not an even shear mode so that troublesome responses due to the coupling between even shear and odd flexural modes is minimized. Coupling between the odd shear and even flexural modes may in addition be minimized by spacing the electrodes from the ends of the plate and if necessary arranging further earthed electrodes in at least part of the resulting marginal portion to remove the piezo-electric stress from these portions. These earthed electrodes should, however, be narrow otherwise excitation of the even order shear mode will result. Fig. 12 shows one of each type of crystal element arranged in cascade in a narrow band filter comprising in addition, input and output low-pass half section impedance transforming networks L1, C1, and resistance pads 32, 33 for minimizing changes in response due to temperature variation. The capacitors C2 represent the self-capacitances of the element. With this arrangement spurious responses of each section are suppressed by the other. The first crystal has a resonance peak below the passband and the second crystal a resonance peak above the pass-band.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US481089A US2373431A (en) | 1943-03-30 | 1943-03-30 | Electric wave filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB631772A true GB631772A (en) | 1949-11-09 |
Family
ID=23910550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB21775/47A Expired GB631772A (en) | 1943-03-30 | 1947-08-07 | Improvements in electric wave filters incorporating piezoelectric crystal elements |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2373431A (en) |
| CH (1) | CH272696A (en) |
| FR (1) | FR948664A (en) |
| GB (1) | GB631772A (en) |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2524781A (en) * | 1945-06-18 | 1950-10-10 | Standard Telephones Cables Ltd | Filter |
| US2988714A (en) * | 1957-09-12 | 1961-06-13 | Gen Electric | Piezoelectric filter network |
| US2965861A (en) * | 1957-09-18 | 1960-12-20 | Collins Radio Co | Thickness-shear-mode mechanical filter |
| NL239635A (en) * | 1958-05-30 | |||
| US2943278A (en) * | 1958-11-17 | 1960-06-28 | Oskar E Mattiat | Piezoelectric filter transformer |
| US3018451A (en) * | 1958-12-04 | 1962-01-23 | Mattiat Oskar | Piezoelectric resonator with oppositely poled ring and spot |
| DE1209336B (en) * | 1960-12-01 | 1966-01-20 | Bosch Arma Corp | Bending vibration transducer designed as an edge-free circular disc for generating sound vibrations |
| US3396327A (en) * | 1961-12-27 | 1968-08-06 | Toyotsushinki Kabushiki Kaisha | Thickness shear vibration type, crystal electromechanical filter |
| US3437848A (en) * | 1964-09-24 | 1969-04-08 | Telefunken Patent | Piezoelectric plate filter |
| US3585537A (en) * | 1969-02-10 | 1971-06-15 | Bell Telephone Labor Inc | Electric wave filters |
| US3633134A (en) * | 1969-10-10 | 1972-01-04 | Motorola Inc | Crystal band pass filter circuit |
| US3656180A (en) * | 1970-08-12 | 1972-04-11 | Bell Telephone Labor Inc | Crystal filter |
| DE2045152C3 (en) * | 1970-09-11 | 1975-02-06 | Braun Ag, 6000 Frankfurt | Oscillating motor with bilaminar flexural oscillators for electrically powered dry shavers |
| US3739304A (en) * | 1971-09-27 | 1973-06-12 | Bell Telephone Labor Inc | Resonator interconnections in monolithic crystal filters |
| JPS4944648A (en) * | 1972-08-31 | 1974-04-26 | ||
| US3792294A (en) * | 1972-10-19 | 1974-02-12 | Bell Telephone Labor Inc | Rectangular at-cut crystal plate |
| JPS5249618Y2 (en) * | 1972-10-21 | 1977-11-11 | ||
| JPS539917B2 (en) * | 1973-05-02 | 1978-04-10 | Suwa Seikosha Kk | |
| US3944951A (en) * | 1974-11-21 | 1976-03-16 | Bell Telephone Laboratories, Incorporated | Monolithic crystal filter |
| WO2014172617A1 (en) * | 2013-04-18 | 2014-10-23 | Cornell University | Monolithic pzt actuator, stage, and method for making |
-
1943
- 1943-03-30 US US481089A patent/US2373431A/en not_active Expired - Lifetime
-
1947
- 1947-06-09 CH CH272696D patent/CH272696A/en unknown
- 1947-06-30 FR FR948664D patent/FR948664A/en not_active Expired
- 1947-08-07 GB GB21775/47A patent/GB631772A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR948664A (en) | 1949-08-08 |
| US2373431A (en) | 1945-04-10 |
| CH272696A (en) | 1950-12-31 |
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