Transducer for surface wave filters with reduced diffraction
US4083021A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 12, 1976 |
| Grant date | Apr 4, 1978 |
| Priority date | — |
| Expiry date | Oct 12, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/6426
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An input transducer for a surface wave filter with a transfer function T(F) the inverse Fourier transform of which is a function I(t) having maxima the amplitude of which vary within wide limits; such an input transducer comprises at least two elemental transducers of which one has a pulse response comprising the high-amplitude maxima of I(t), while the other(s) has/have a pulse response comprising maxima equal to n times the low-amplitude maxima of I(t); the first is fed by the signal to be filtered; the other(s) is/are fed by a signal equal to 1/n of the signal to be filtered. Such a transducer arranged at one end of a piezoelectric substrate of which the other end comprises a wide-band output transducer, provides for the construction of high quality filters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.