ZA897341B - Surface-wave interdigital transducer and surface-wave filter having symmetrical or definable asymmetrical transfer characteristic between input and output - Google Patents
Surface-wave interdigital transducer and surface-wave filter having symmetrical or definable asymmetrical transfer characteristic between input and outputInfo
- Publication number
- ZA897341B ZA897341B ZA897341A ZA897341A ZA897341B ZA 897341 B ZA897341 B ZA 897341B ZA 897341 A ZA897341 A ZA 897341A ZA 897341 A ZA897341 A ZA 897341A ZA 897341 B ZA897341 B ZA 897341B
- Authority
- ZA
- South Africa
- Prior art keywords
- wave
- definable
- symmetrical
- input
- output
- Prior art date
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
- H03H9/02—Details
- H03H9/02535—Details of surface acoustic wave devices
- H03H9/02818—Means for compensation or elimination of undesirable effects
- H03H9/02842—Means for compensation or elimination of undesirable effects of reflections
-
- 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
- H03H9/6489—Compensation of undesirable effects
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3832944A DE3832944A1 (en) | 1988-09-28 | 1988-09-28 | SURFACE WAVE INTERDIGITAL CONVERTER AND SURFACE WAVE FILTER WITH SYMMETRICAL OR PRESETABLE UNSYMMETRIC TRANSMISSION CHARACTERISTICS BETWEEN INPUT AND OUTPUT |
Publications (1)
Publication Number | Publication Date |
---|---|
ZA897341B true ZA897341B (en) | 1990-06-27 |
Family
ID=6363896
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ZA897341A ZA897341B (en) | 1988-09-28 | 1989-09-27 | Surface-wave interdigital transducer and surface-wave filter having symmetrical or definable asymmetrical transfer characteristic between input and output |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0436565B1 (en) |
JP (1) | JP3172523B2 (en) |
DE (2) | DE3832944A1 (en) |
DK (1) | DK46591D0 (en) |
ES (1) | ES2015483A6 (en) |
GR (1) | GR890100593A (en) |
PT (1) | PT91821B (en) |
WO (1) | WO1990003692A1 (en) |
ZA (1) | ZA897341B (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4018784A1 (en) * | 1990-06-12 | 1991-12-19 | Siemens Ag | Surface wave reflection filter |
DE4212517C2 (en) * | 1992-04-14 | 1995-02-23 | Siemens Ag | Surface wave arrangement with at least two surface wave structures adjacent in the direction of the main wave propagation |
JP3341709B2 (en) | 1998-06-01 | 2002-11-05 | 株式会社村田製作所 | Surface wave device and communication device using the same |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5320840A (en) * | 1976-08-11 | 1978-02-25 | Hitachi Ltd | Acoustic surface wave device |
US4254387A (en) * | 1977-10-06 | 1981-03-03 | U.S. Philips Corporation | Acoustic wave devices |
JPS57202114A (en) * | 1981-06-05 | 1982-12-10 | Hitachi Ltd | Band pass filter |
JPS58156211A (en) * | 1982-03-11 | 1983-09-17 | Nec Corp | Surface acoustic wave resonator type filter |
-
1988
- 1988-09-28 DE DE3832944A patent/DE3832944A1/en not_active Withdrawn
-
1989
- 1989-08-23 DE DE8989909380T patent/DE58903755D1/en not_active Expired - Fee Related
- 1989-08-23 EP EP89909380A patent/EP0436565B1/en not_active Expired - Lifetime
- 1989-08-23 WO PCT/DE1989/000552 patent/WO1990003692A1/en active IP Right Grant
- 1989-08-23 JP JP50888489A patent/JP3172523B2/en not_active Expired - Fee Related
- 1989-09-20 GR GR890100593A patent/GR890100593A/en unknown
- 1989-09-27 PT PT91821A patent/PT91821B/en not_active IP Right Cessation
- 1989-09-27 ZA ZA897341A patent/ZA897341B/en unknown
- 1989-09-28 ES ES8903285A patent/ES2015483A6/en not_active Expired - Fee Related
-
1991
- 1991-03-15 DK DK91465A patent/DK46591D0/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
DE3832944A1 (en) | 1990-04-05 |
EP0436565B1 (en) | 1993-03-10 |
DE58903755D1 (en) | 1993-04-15 |
WO1990003692A1 (en) | 1990-04-05 |
JP3172523B2 (en) | 2001-06-04 |
PT91821B (en) | 1995-08-09 |
JPH03502867A (en) | 1991-06-27 |
ES2015483A6 (en) | 1990-08-16 |
EP0436565A1 (en) | 1991-07-17 |
DK46591A (en) | 1991-03-15 |
GR890100593A (en) | 1990-10-31 |
PT91821A (en) | 1990-03-30 |
DK46591D0 (en) | 1991-03-15 |
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