Surface acoustic wave filter capable of widening a bandwidth

Details Surface acoustic wave filter capable of widening a bandwidth Surface acoustic wave filter capable of widening a bandwidth

1993-07-16

1995-02-21

Pascal, Robert J.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333194, 310313B, H03H 963

Patent

active

053920139

ABSTRACT:
In a surface acoustic wave filter utilizing at least two longitudinal modes, input and output interdigital transducers are mounted on a piezoelectric substrate so as to oppose each other. First and second grating reflectors are mounted on the piezoelectric substrate outside the input and the output interdigital transducers, respectively. Each of the input and the output interdigital transducers comprises a plurality of electrode digits which are equal to N in number. Each of the electrode digits is made of a metal material having a discontinuous impedance coefficient K related to acoustic impedance. The surface acoustic wave filter is structured so that a product of the number N and the discontinuous impedance coefficient K is not smaller than 0.55.

REFERENCES:
patent: 4151492 (1979-04-01), Sandy et al.
patent: 4162466 (1979-07-01), Hunsinger et al.
patent: 4387355 (1983-06-01), Uno et al.

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