Enhancement Mechanism of Quality Factor in Lamb Wave Resonators by Phononic Crystals
To address the high transmission loss of Lamb wave resonators at frequencies exceeding 6 GHz,this paper introduces an anchoring structure based on phononic crystal(PnC)arrays with distinct band gaps.This design effectively enhances the quality factor(Q)of lithium niobate Lamb wave resonators(LWRs),thereby reducing the insertion loss of Lamb wave filters.By constructing a finite element simulation model of the PnC structure,we ana-lyzed the dispersion relationship of the PnC structure.Utilizing a PnC delay line model,we investigated the trans-mission characteristics of the PnC array.Through a comparative analysis of resonator performance,this study con-firms that under stable resonance frequency conditions,the Q value of the resonator using PnC array anchors is in-creased by a factor of five compared to traditional uniform beam anchor resonators.
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