Complementary-polarity double-layer LiTaO3 resonators for symmetry-selective SH2 excitation with ultrahigh electromechanical coupling (kt^2 = 25.7%)
This paper reports a novel double-layer lithium tantalate (LiTaO3) bulk acoustic resonator using complementary-polarity films that achieves an ultrahigh electromechanical coupling coefficient of through symmetry-selective excitation of the SH2 mode.