The passband width obtained in the SAW ladder filter is inherently limited by the electromechanical coupling factor of piezoelectric substrate. A kind of elliptic SAW filter is proposed in this paper. The relative bandwidth of the attainable filter can be controlled flexibly on the same substrate, especially on the strong piezoelectric substrate. Due to the capacitance ratio γ, the additional zero point and pole point are appeared at the two sides of the passband after the resonators in the elliptic LC filter are replaced by SAW resonators. The static capacitor of each resonator are optimized by introducing the simulation annealing, thus the narrow band, low loss filter with high shape factor has been realized. The effect of the design technique is verified by the experiment
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王华磊,钟慧,石玉,李利平,周林生.第二类椭圆型声表面波滤波器的设计[J].压电与声光,2013,35(6):786-787. WANG Hualei, ZHONG Hui, SHI Yu, LI Liping, ZHOU Linsheng. Design of Narrow Bandwidth Elliptic type Ⅱ SAW Filters[J]. PIEZOELECTRICS AND ACOUSTOOPTICS