GB1479171A - Electrical filters - Google Patents
Electrical filtersInfo
- Publication number
- GB1479171A GB1479171A GB39238/74A GB3923874A GB1479171A GB 1479171 A GB1479171 A GB 1479171A GB 39238/74 A GB39238/74 A GB 39238/74A GB 3923874 A GB3923874 A GB 3923874A GB 1479171 A GB1479171 A GB 1479171A
- Authority
- GB
- United Kingdom
- Prior art keywords
- crystal
- arm
- capacitances
- series
- circuit
- 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 5
- 230000003534 oscillatory 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
- H03H9/542—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)
- Filters And Equalizers (AREA)
Abstract
1479171 Band-stop filters SIEMENS AG 9 Sept 1974 [21 Sept 1973] 39238/74 Heading H3U A band-stop filter comprises a bridged-T network having capacitances in its series arm, an inductance Ls in its shunt arm, a parallel oscillatory circuit Lp, Cp in its bridging arm, and a two-circuit monolithic crystal connected to the series arm so that the connection capacitances of the crystal are in parallel with the series-arm capacitances to form combined capacitances Cs. In Fig. 4 is shown a filter with the equivalent circuit of the crystal. In Fig. 8 both the equivalent and actual crystal circuits of another embodiment are shown. To transform the crystal impedance the resonant circuit inductance Lp is constituted by an auto-transformer. An additional capacitance may be provided in series with the shunt inductances Ls.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19732347685 DE2347685C3 (en) | 1973-09-21 | Band stop for electrical oscillations |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1479171A true GB1479171A (en) | 1977-07-06 |
Family
ID=5893324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB39238/74A Expired GB1479171A (en) | 1973-09-21 | 1974-09-09 | Electrical filters |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS5525736B2 (en) |
| AT (1) | AT346388B (en) |
| BE (1) | BE820166A (en) |
| FR (1) | FR2245128B1 (en) |
| GB (1) | GB1479171A (en) |
| IT (1) | IT1021493B (en) |
| NL (1) | NL7412500A (en) |
| SE (1) | SE7411869L (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5885612A (en) * | 1981-11-17 | 1983-05-23 | Tohoku Metal Ind Ltd | Edge mode ceramic filter |
| JPS6426309A (en) * | 1987-07-21 | 1989-01-27 | Matsushita Electric Works Ltd | Box assembly having stepped rim |
-
1974
- 1974-09-09 GB GB39238/74A patent/GB1479171A/en not_active Expired
- 1974-09-13 FR FR7431078A patent/FR2245128B1/fr not_active Expired
- 1974-09-18 IT IT27422/74A patent/IT1021493B/en active
- 1974-09-19 AT AT754574A patent/AT346388B/en not_active IP Right Cessation
- 1974-09-20 JP JP10870474A patent/JPS5525736B2/ja not_active Expired
- 1974-09-20 NL NL7412500A patent/NL7412500A/en unknown
- 1974-09-20 BE BE148748A patent/BE820166A/en unknown
- 1974-09-20 SE SE7411869A patent/SE7411869L/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BE820166A (en) | 1975-01-16 |
| JPS5525736B2 (en) | 1980-07-08 |
| IT1021493B (en) | 1978-01-30 |
| NL7412500A (en) | 1975-03-25 |
| FR2245128B1 (en) | 1978-11-24 |
| ATA754574A (en) | 1978-03-15 |
| SE7411869L (en) | 1975-03-24 |
| DE2347685B2 (en) | 1976-01-22 |
| FR2245128A1 (en) | 1975-04-18 |
| JPS5078247A (en) | 1975-06-26 |
| AT346388B (en) | 1978-11-10 |
| AU7354274A (en) | 1976-03-25 |
| DE2347685A1 (en) | 1975-04-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |