Weighting surface wave filters by withdrawing electrodes
US3946342A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 10, 1973 |
| Grant date | Mar 23, 1976 |
| Priority date | — |
| Expiry date | Aug 10, 1993 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/14526
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Prior art methods for shaping the impulse response of a surface wave delay line interdigital transducer include finger width weighting and finger overlap weighting. The new method for shaping the transducer impulse response disclosed herein overcomes several objectional characteristics of the prior art methods. The new method involves removal of individual fingers or groups of fingers from selected portions of the transducer. The amplitude of the impulse response in those regions from which fingers have been removed is reduced below the value which it would have if no fingers had been removed. The method thus provides the capability to control the relative amplitudes of the impulse response along the length of the transducer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.