Research and Simulation of Multi-Modal Acoustic Response Based on COM-MBVD Hybrid Modeling
The coupling-of-modes(COM)model is extensively used in the design of surface acoustic wave(SAW)filters.However,the conventional single-mode COM model is insufficient for accounting for spurious modes,such as higher-order horizontal shear waves and Sezawa waves at the far end.In this study,we first used the single-mode COM model and integrated it with a resonant branch similar to the MBVD equivalent circuit to es-tablish the COM-MBVD model for accommodating the multi-modal acoustic response.Subsequently,an 8th-order ladder structure circuit was constructed for optimization simulation,following this model.The final configuration resulted in a SAW filter with a central frequency of 1 590 MHz,a passband insertion loss below 1.6 dB,an in-band fluctuation of 1 dB,and a bandwidth of 80 MHz(equivalent to a relative bandwidth of 5%).The alignment between the test and simulation data confirms the viability of the design approach.
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