GB1209808A - Improvements in or relating to electromechanical band-pass filters - Google Patents
Improvements in or relating to electromechanical band-pass filtersInfo
- Publication number
- GB1209808A GB1209808A GB54791/68A GB5479168A GB1209808A GB 1209808 A GB1209808 A GB 1209808A GB 54791/68 A GB54791/68 A GB 54791/68A GB 5479168 A GB5479168 A GB 5479168A GB 1209808 A GB1209808 A GB 1209808A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pair
- screen
- electrode
- slabs
- resonators
- 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
- 239000003990 capacitor Substances 0.000 abstract 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract 1
- 230000002238 attenuated effect Effects 0.000 abstract 1
- DMFGNRRURHSENX-UHFFFAOYSA-N beryllium copper Chemical compound [Be].[Cu] DMFGNRRURHSENX-UHFFFAOYSA-N 0.000 abstract 1
- 229910052802 copper Inorganic materials 0.000 abstract 1
- 239000010949 copper Substances 0.000 abstract 1
- 239000000463 material Substances 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
- H03H9/58—Multiple crystal filters
Landscapes
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Abstract
1,209,808. Electromechanical filters. GENERAL ELECTRIC and ENGLISH ELECTRIC COMPANIES Ltd. 30 Oct., 1969 [19 Nov.; 1968], No. 54791/68. Heading H3U. A band-pass filter in which unwanted responses in the stop band are highly attenuated comprises two quartz slabs 1, 2 each having three resonators, vibrating in thickness shear mode, formed by pairs of electrodes 3 . . . 5 and 6 . . . 8, respectively, deposited on opposite faces of the slabs. The slabs 1, 2 have different thicknesses so as to have different resonant frequencies; however, the fundamental resonant frequency of all six resonators is the same since different plateback values are chosen for the two slabs, these different values being obtained by giving different thicknesses to the electrodes of the two slabs. " Plateback " is the reduction of the resonant frequency of the slab due to the electrode masses. The resonators of each slab are mechanically connected in series by the slab material situated between the three resonators, the two groups of three resonators being electrically connected in series. The slabs 1, 2 are mounted on insulating support frames 10, 11 separated by a beryllium-copper screen 12. Copper strips 13 on the frames 10, 11 are connected through strips 9 to the respective electrodes. Thus, one electrode of pair 3 is connected to input lead 14, the other electrode of this pair being connected via a tab 15 to the earthed screen 12; both electrodes of pair 4 are connected via tabs 16, 17 to the screen 12; one electrode of pair 5 is connected via tab 18 to screen 12, the other electrode of this pair being connected via tab 19 to one end of a capacitor 20 the other end of which is connected to a lug 21 of the screen. Similarly, one electrode of pair 6 is connected via a tab 22 to one end of the capacitor 20, the other electrode of this pair being connected via a tab (not shown) to the screen 12; both electrodes of pair 7 are connected to the screen; one electrode of pair 8 is connected to the screen and the other connected to output lead 23. The screen 12 is attached to a base 24 having connection pins 25, 26, the whole unit being enclosed in a can (not shown).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB54791/68A GB1209808A (en) | 1968-11-19 | 1968-11-19 | Improvements in or relating to electromechanical band-pass filters |
| US874629A US3596212A (en) | 1968-11-19 | 1969-11-06 | Electrical band-pass filter employing monolithic crystals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB54791/68A GB1209808A (en) | 1968-11-19 | 1968-11-19 | Improvements in or relating to electromechanical band-pass filters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1209808A true GB1209808A (en) | 1970-10-21 |
Family
ID=10472086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB54791/68A Expired GB1209808A (en) | 1968-11-19 | 1968-11-19 | Improvements in or relating to electromechanical band-pass filters |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US3596212A (en) |
| GB (1) | GB1209808A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4303897A (en) * | 1978-12-20 | 1981-12-01 | Telefonaktiebolaget L M Ericsson | Crystal filter structure for realizing a ladder filter |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3723920A (en) * | 1971-06-24 | 1973-03-27 | Gte Automatic Electric Lab Inc | Crystal filter assembly |
| US3885173A (en) * | 1973-10-09 | 1975-05-20 | Magnavox Co | Apparatus and method for coupling an acoustical surface wave device to an electronic circuit |
| DE2438758C3 (en) * | 1974-08-13 | 1982-09-30 | Draloric Electronic GmbH, 8672 Selb | Piezoelectric resonator arrangement |
| US4484158A (en) * | 1982-07-07 | 1984-11-20 | General Electric Company | Monolithic crystal filter and method of manufacturing same |
| US4980598A (en) * | 1989-12-21 | 1990-12-25 | Lucas Schaevitz Inc. | Monolithic resonator for a vibrating beam accelerometer |
| US5109176A (en) * | 1990-11-16 | 1992-04-28 | Motorola, Inc. | Mounting for multiple crystal filter blanks |
| US5446335A (en) * | 1993-02-19 | 1995-08-29 | Murata Mfg. Co., Ltd. | Piezoresonator with a built-in capacitor and a manufacturing method thereof |
| JP3750561B2 (en) * | 2001-05-23 | 2006-03-01 | 株式会社村田製作所 | Method for manufacturing piezoelectric component |
-
1968
- 1968-11-19 GB GB54791/68A patent/GB1209808A/en not_active Expired
-
1969
- 1969-11-06 US US874629A patent/US3596212A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4303897A (en) * | 1978-12-20 | 1981-12-01 | Telefonaktiebolaget L M Ericsson | Crystal filter structure for realizing a ladder filter |
Also Published As
| Publication number | Publication date |
|---|---|
| US3596212A (en) | 1971-07-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |