Surface acoustic wave resonator

Details Surface acoustic wave resonator Surface acoustic wave resonator

1981-05-28

1983-06-07

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333196, H03H 925, H03H 964

Patent

active

043873553

ABSTRACT:
A surface acoustic wave (SAW) resonator in which a pair of surface acoustic wave reflectors are spaced apart on a piezoelectric substrate from each other by a suitable distance and each consists of a grating electrode construction and a periodic array of grooves and a surface acoustic wave transducer which consists of an interdigital electrode structure and a periodic array of grooves is interposed between the reflectors and spaced apart therefrom by a suitable distance. The electrode period L.sub.T of the transducer and the electrode period L.sub.R of the reflectors are so selected as to satisfy the following equation: ##EQU1## where C.sub.1T : the acoustic mismatching term at the boundary between the electroded portion and the non-electroded portion of the transducer and is given by

REFERENCES:
patent: 4178571 (1979-12-01), Mitchell
patent: 4237433 (1980-12-01), Tanski
Uno et al., "Realization of Miniature Saw Resonators Having a High Quality Factor," Japanese Journal of Applied Physics, vol. 20, Supplement 20-3, Sep. 1, 1981; pp. 85-88.

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