Surface wave filter with a specified transducer impulse train th

Details Surface wave filter with a specified transducer impulse train th Surface wave filter with a specified transducer impulse train th

1995-12-20

1998-09-15

Pascal, Robert J.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313C, H03H 964

Patent

active

058085246

ABSTRACT:
A transversal SAW filter capable of reducing the effect of diffraction to achieve desired transmission characteristics without increasing the size of the surface wave substrate includes first and second IDTs arranged on a surface wave substrate so as to be spaced from each other by a predetermined distance. The first IDT has a plurality of impulses and the impulse in the 2n-th (n is a natural number) position counted from an impulse located at a maximum cross length in the 0-th position toward the second IDT has a magnitude which is equal to a magnitude of the (2n-1)-th impulse multiplied by -1.0.

REFERENCES:
patent: 3633132 (1972-01-01), Hartemann
patent: 4007433 (1977-02-01), Houkawa et al.
Suzuki, Y. et al., "Some Studies on Saw Resonators and Multiple-Mode Filters", 1976 Ultrasonics Symposium Proceedings, 1976, pp. 297-302.

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