Transducer for surface wave filters with an asymmetrical transfer function
US4068141A · kind A · utility
2Cited by
4References
4Claims
0Family size
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Key dates
| Filing date | Jul 20, 1976 |
| Grant date | Jan 10, 1978 |
| Priority date | — |
| Expiry date | Jul 20, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/30
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An input transducer for surface wave filters having an asymmetrical transfer function comprises two pairs (5 and 6) of interdigital combs disposed side by side on the same piezoelectric substrate staggered by one quarter of the acoustic wavelength, one having a symmetrical transfer function and the other an anti-symmetrical transfer function. The asymmetrical transfer function filter is obtained by summing the two acoustic waves generated by such an input transducer in a wide band output transducer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.