GB1420966A - Surface acoustic wave filter devices - Google Patents
Surface acoustic wave filter devicesInfo
- Publication number
- GB1420966A GB1420966A GB5725272A GB5725272A GB1420966A GB 1420966 A GB1420966 A GB 1420966A GB 5725272 A GB5725272 A GB 5725272A GB 5725272 A GB5725272 A GB 5725272A GB 1420966 A GB1420966 A GB 1420966A
- Authority
- GB
- United Kingdom
- Prior art keywords
- characteristic impedance
- reflecting means
- surface wave
- energy reflecting
- acoustic wave
- 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
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
- H03H9/64—Filters using surface acoustic waves
- H03H9/6423—Means for obtaining a particular transfer characteristic
- H03H9/6426—Combinations of the characteristics of different transducers
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
1420966 Surface wave filters STANDARD TELEPHONES & CABLES Ltd 6 Dec 1973 [12 Dec 1972] 57252/72 Heading H3V A surface wave acoustic wave filter, comprising a piezoelectric body 30 carrying input and output interdigitated transducer sets 31, 32 interspersed along the body, has a respective electromagnetic energy reflecting means connected across each transducer set to obtain a high-Q resonance arrangement. In the embodiment of Fig. 3, the energy reflecting means comprise similar electrical susceptance networks jB. The Fig. 4 embodiment comprises a filter 41 with a characteristic impedance Z 2 connected in series with two further surface wave devices 42, 43 each having a characteristic impedance Z 1 and thus acting as an energy reflecting means. Fig. 5 (not shown) depicts four filters (50-53) connected in series and having the same characteristic impedance. Connected across their end and intermediate connections are susceptance networks (54-58), the whole arrangement being electrically symmetric. In a final embodiment (Fig. 6, not shown) a common electrode is provided as a meander line which forms input transducers with a first set of fingers (61) and output transducers with a second set (62).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5725272A GB1420966A (en) | 1972-12-12 | 1972-12-12 | Surface acoustic wave filter devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5725272A GB1420966A (en) | 1972-12-12 | 1972-12-12 | Surface acoustic wave filter devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1420966A true GB1420966A (en) | 1976-01-14 |
Family
ID=10478751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5725272A Expired GB1420966A (en) | 1972-12-12 | 1972-12-12 | Surface acoustic wave filter devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1420966A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0196770A2 (en) * | 1985-02-25 | 1986-10-08 | Oki Electric Industry Company, Limited | Surface acoustic wave filter |
| EP0322622A2 (en) * | 1987-12-30 | 1989-07-05 | Motorola, Inc. | Monolithic lattice saw filter |
-
1972
- 1972-12-12 GB GB5725272A patent/GB1420966A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0196770A2 (en) * | 1985-02-25 | 1986-10-08 | Oki Electric Industry Company, Limited | Surface acoustic wave filter |
| EP0196770A3 (en) * | 1985-02-25 | 1987-12-09 | Oki Electric Industry Company, Limited | Surface acoustic wave filter |
| EP0322622A2 (en) * | 1987-12-30 | 1989-07-05 | Motorola, Inc. | Monolithic lattice saw filter |
| EP0322622A3 (en) * | 1987-12-30 | 1990-08-08 | Motorola, Inc. | Monolithic lattice saw filter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |