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前言近年来,由于压电陶瓷材料性能不断改进,在滤波器方面得到越来越广泛的应用。滤波器用压电材料要求有高机械品质因素,随温度和时间的变化小,合适的介电常数,而且相应于滤波器不同的通带宽度,要求各种大小不同的机电耦合系数。虽然改变配方成份可以调整压电陶瓷的机电耦合系数(振子带宽),但同时又要具有其它方面的优良性能却不是容易的
In recent years, due to the continuous improvement of piezoelectric ceramic material properties, the filter has been more widely used. Piezoelectric materials for filters require high mechanical quality factors, small changes with temperature and time, suitable dielectric constants, and corresponding various filter passband widths, requiring various electromechanical coupling coefficients of various sizes. Although it is not easy to change the composition of the piezoelectric ceramic to adjust the electromechanical coupling coefficient (oscillator bandwidth), but at the same time it has other excellent properties