Patent ID: 7102269

Claim:
A surface acoustic wave device comprising: first and second double-mode surface acoustic wave resonator filters connected in parallel to each other, each of said first and second double-mode surface acoustic wave resonator filters including a piezoelectric substrate, IDT electrodes and grating reflectors disposed on the piezoelectric substrate; wherein the first double-mode surface acoustic wave resonator filter has resonance frequencies f 1 L and f 1 H, where f 1 L<f 1 H; the second double-mode surface acoustic wave resonator filter has resonance frequencies f 2 L and f 2 H, where f 2 L<f 2 H; f 1 H=f 2 L; and an energy transmittance of the reflectors in at least one of the first and the second double-mode surface acoustic wave resonator filters ranges from about 12% to about 28%.