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Piezoelectric substrate
Acoustic absorber -3dB
Acoustic absorber -3dB
SAW
Input
Output
Crystal substrate: SiO2 or LiNbO3 or LiTaO3 or La3Ga5SiO14
(quartz) stability ↔ coupling (langasite)
Electrode
Travelling surface wave → finite impulse response (FIR)