Surface acoustic wave device having two resonators with partiall

Details Surface acoustic wave device having two resonators with partiall Surface acoustic wave device having two resonators with partiall

1998-05-21

1999-09-07

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333196, 310313C, 310313D, H03H 964

Patent

active

059493070

ABSTRACT:
A surface acoustic wave device includes first and second longitudinal mode resonators. The first longitudinal mode resonator has two resonance modes, i.e., a longitudinal mode distributed in the same direction as a propagating direction of a surface acoustic wave (SAW) and a transverse mode distributed in a direction perpendicular to the propagating direction of the SAW. The second longitudinal mode resonator is arranged adjacent to the first resonator in a direction perpendicular to the propagating direction of the SAW, and has two resonance modes, i.e., a longitudinal mode and a transverse mode. The resonance modes of the second longitudinal mode resonator are acoustically coupled to the resonance modes of the first longitudinal mode resonator. The first longitudinal mode resonator has an output InterDigital Transducer (IDT) having an interdigital electrode to excite a SAW. The second longitudinal mode resonator has an input IDT having an interdigital electrode to receive the SAW from the output IDT. The interdigital electrodes of the input and output IDTs are arranged adjacent to each other in a direction perpendicular to the propagating direction of the SAW and to partially overlap each other in the same direction as the propagating direction.

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