To improve the service life and design efficiency of SAW filters,it is necessary to explore the effect of resonant units on the power tolerance of filters.Firstly,a resonator model consisting of Al electrodes,42°Y-X LiTaO3 piezoelectric material film,and SiO2/Poly-Si/Si substrate was constructed using FEM software,and the impact of IDT,aperture size,and half-period on its impedance was analyzed.Meanwhile,a method was proposed to test resonator power,which could calculate the loaded power as a function of input power at each frequency point of the resonator.To verify the reliability of the method,the power test of the B41(2515-2675 MHz)filter in 3030C package was performed.It shows that the filter burns out at input power of 23 dBm,which is consistent with the simulation.Finally,the capacitance formula and simulation data together confirm that the area variation of the resonator will change the capacitance ratio of the filter,which in turn affects the heat dissipation of the filter.Therefore,the power tolerance of the filter can be improved by varying the series-parallel structure of each branch of the SAW filter,the number of pairs of fork fingers,aperture diameter,and half-period of each resonator.
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