GB928955A - Improvements in or relating to electric filter networks - Google Patents
Improvements in or relating to electric filter networksInfo
- Publication number
- GB928955A GB928955A GB3833360A GB3833360A GB928955A GB 928955 A GB928955 A GB 928955A GB 3833360 A GB3833360 A GB 3833360A GB 3833360 A GB3833360 A GB 3833360A GB 928955 A GB928955 A GB 928955A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resonators
- filter
- crystals
- electric
- piezo
- 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 abstract 4
- 238000007747 plating Methods 0.000 abstract 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 abstract 1
- 239000010931 gold Substances 0.000 abstract 1
- 229910052737 gold Inorganic materials 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
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
- H03H9/542—Filters comprising resonators of piezoelectric or electrostrictive material including passive elements
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Abstract
928,955. Piezo-electric crystals; filters. GENERAL ELECTRIC CO. Ltd. Nov. 7, 1961 [Nov. 8, 1960], No. 38333/60. Class 40 (8). A filter comprises a number of piezo-electric thickness-shear resonators having the same fundamental frequency but having plating patterns which differ in the marginal regions of the crystals whereby the inharmonic overtone frequencies are different. The four crystals shown are bevelled quartz discs of AT or BT cut and have identical central electrodes 1 of deposited gold. The lead-off strips 2, 4, 7, 8 differ, however, either in shape or thickness. In addition, small plated areas 3, 5, 6, 9, 10 may be deposited near the edges of certain of the crystal plates. These areas are not connected to the electrodes. The resonators may be arranged as shunt elements in a low-pass LC ladder filter to provide an attenuation notch at a desired frequency. In the band-pass filter of Fig. 3, the pairs of resonators Q5, Q7 have the same fundamental frequency which differs slightly from the resonant frequency of the pair Q6, Q8. The two arms of the filter are connected by a 1: 1 auto-transformer. The plating patterns on pairs of resonators having identical resonant frequencies are made slightly different in order to obtain non-coincident overtones.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3833360A GB928955A (en) | 1960-11-08 | 1960-11-08 | Improvements in or relating to electric filter networks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3833360A GB928955A (en) | 1960-11-08 | 1960-11-08 | Improvements in or relating to electric filter networks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB928955A true GB928955A (en) | 1963-06-19 |
Family
ID=10402790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3833360A Expired GB928955A (en) | 1960-11-08 | 1960-11-08 | Improvements in or relating to electric filter networks |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB928955A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49131593A (en) * | 1973-04-20 | 1974-12-17 | ||
| JPS49131590A (en) * | 1973-04-20 | 1974-12-17 | ||
| FR2380670A1 (en) * | 1977-02-09 | 1978-09-08 | Seikosha Kk | QUARTZ OSCILLATOR OPERATING IN THICKNESS SHEAR MODE |
| JPS5648121U (en) * | 1980-08-21 | 1981-04-28 | ||
| GB2238907A (en) * | 1989-11-30 | 1991-06-12 | Seikosha Kk | Piezo-electric oscillator |
-
1960
- 1960-11-08 GB GB3833360A patent/GB928955A/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49131593A (en) * | 1973-04-20 | 1974-12-17 | ||
| JPS49131590A (en) * | 1973-04-20 | 1974-12-17 | ||
| JPS5731323B2 (en) * | 1973-04-20 | 1982-07-03 | ||
| FR2380670A1 (en) * | 1977-02-09 | 1978-09-08 | Seikosha Kk | QUARTZ OSCILLATOR OPERATING IN THICKNESS SHEAR MODE |
| JPS5648121U (en) * | 1980-08-21 | 1981-04-28 | ||
| GB2238907A (en) * | 1989-11-30 | 1991-06-12 | Seikosha Kk | Piezo-electric oscillator |
| GB2238907B (en) * | 1989-11-30 | 1993-05-26 | Seikosha Kk | Piezo-electric oscillator |
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