A periodically poled bi-layer lithium niobate resonator excites a second-order thickness mode at 19.23 MHz with Q=3187 and k2=29%, claiming the highest f*Q among piezoelectric power resonators.
57 GHz acoustic resonator with k 2 of 7.3kslash% and Q of 56 in thin-film lithium niobate,
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Periodically Poled Piezoelectric Lithium Niobate Resonator for Piezoelectric Power Conversion
A periodically poled bi-layer lithium niobate resonator excites a second-order thickness mode at 19.23 MHz with Q=3187 and k2=29%, claiming the highest f*Q among piezoelectric power resonators.