Surface acoustic wave filter with feedforward to reduce triple t

Details Surface acoustic wave filter with feedforward to reduce triple t Surface acoustic wave filter with feedforward to reduce triple t

1979-03-05

1980-12-02

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333151, 333193, H03H 964, H03H 925

Patent

active

042374324

ABSTRACT:
A surface acoustic wave filter device having an input transducer and an output transducer, in which triple transit effects are minimized by the addition of a second output transducer spaced from the input transducer, preferably by a distance three times the spacing between the normal input and output transducers, to duplicate the triple transit path length. A triple transit signal is thereby simulated at the second output transducer, is adjusted in amplitude and phase, and is applied to a summing circuit in which the simulated triple transit signal is subtracted from a signal derived from the original output transducer, to effectively cancel the triple transit component.

REFERENCES:
patent: 3908137 (1975-09-01), Hunsinger et al.

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