Surface acoustic wave resonator

Details Surface acoustic wave resonator Surface acoustic wave resonator

1987-01-06

1988-07-26

Laroche, Eugene R.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333195, 310313B, 310313D, H03H 925

Patent

active

047603593

ABSTRACT:
A surface acoustic wave resonator has two solid-type interdigital transducers and two grating reflectors arranged on a piezoelectric substrate or on a surface acoustic wave substrate which contains a piezoelectric material and the reflectors are arranged outside these transducers. If the electrode pitch of the interdigital transducers is suitably different from the pitch of grating of the reflectors, ripples caused by the triple transit echo at frequencies other than the peak frequency are deviated so as to lie outside the stop band of the reflectors, so that spurious responses are suppressed. In this case, the number of electrode pairs Ni of the interdigital transducers should satisfy a relation, Ni.gtoreq..pi./.epsilon., wherein .epsilon. denotes a characteristic mechanical impedance mismatch contribution on the surface of the electrode and on the free surface in the interdigital transducers, so that a peak caused by the trapping of energy in the interdigital transducers is brought into agreement with a peak caused by the triple transit echo to decrease the losses and to increase the Q value.

REFERENCES:
patent: 4249146 (1981-02-01), Yen et al.
patent: 4281301 (1981-07-01), Stevens et al.
patent: 4325037 (1982-04-01), Bulst et al.

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