Leaky SAW resonator and method

Details Leaky SAW resonator and method Leaky SAW resonator and method

2006-03-21

2008-11-18

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C310S31300R, C310S31300R, C333S193000

Reexamination Certificate

active

07453334

ABSTRACT:
A SAW ladder filter includes grating pads extending from opposing bus bars and interdigital transducer electrodes extending from the grating pads for defining an acoustic aperture. The metalization ratio for the grating pads is greater than that for the interdigital transducer electrodes. Reflector electrodes are disposed on opposing longitudinal sides of the interdigital transducer electrodes. Operation of the filter results in a velocity of the SAW along the grating pads slower than a SAW velocity along the plurality of interdigital transducer electrodes, thus producing a wave guiding effect for optimizing SAW propagation within the acoustic aperture. The grating pads may be longitudinally offset from cooperating interdigital transducer electrodes using minor bus bars.

REFERENCES:
patent: 4999535 (1991-03-01), Mariani et al.
patent: 6072377 (2000-06-01), Tajima et al.
patent: 6404101 (2002-06-01), Taniguchi et al.
patent: 6946931 (2005-09-01), Inoue et al.
patent: 3-158014 (1991-07-01), None
patent: 6-164297 (1994-06-01), None
patent: 11-298286 (1999-10-01), None
Machine translation (detailed description) of Hirota JP 11-298286, Oct. 1999, six pages.

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