Combining series sections weighting with withdrawal weighting in

Details Combining series sections weighting with withdrawal weighting in Combining series sections weighting with withdrawal weighting in

1980-03-24

1982-03-23

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333194, H03H 964, H03H 925, H01L 4104

Patent

active

043215670

ABSTRACT:
A transducer for a SAW device having withdrawal weighting combined with series sections weighting to achieve a desired frequency response. Withdrawal weighting is employed where the impulse response can be adequately approximated by a withdrawal pattern with series sections electrodes being used to provide the additional weighting required. Additionally, electrodes using a different number of series sections are separated by a gap a few wavelengths wide in order to avoid sharp discontinuities.

REFERENCES:
patent: 3931597 (1976-01-01), Cho et al.
patent: 4006438 (1977-02-01), Bennett
patent: 4065789 (1977-12-01), DeVries
patent: 4143340 (1979-03-01), Hunsinger
patent: 4146808 (1979-03-01), Laker et al.
patent: 4146851 (1979-03-01), Dempsey et al.
patent: 4223285 (1980-09-01), Hazama et al.
Hartmann-"Weighting Interdigital Surface Wave Transducers by Selective Withdrawal of Electrodes", 1973 Ultrasonics Symposium Proceenings, IEEE Cat. #73 CHO 807-85U; pp. 423-426.
Hartmann et al.-Impulse model design of Acoustic Surface-Wave Filters", IEEE Trans. on Microwave Theory and Techniques, vol. MTT-21, No. 4, Apr. 1973; pp. 162-167.

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