Design of ultra-wideband surface acoustic wave filters

2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA) Pub Date : 2015-12-28 DOI:10.1109/SPAWDA.2015.7364462

Liu Zhou, Tao Han, Qiaozhen Zhang, X. Ji, Jing Chen

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Abstract

This paper describes working principles of traditional ladder-type surface acoustic wave (SAW) filter composed by resonators. The simulation model was founded by utilizing Quite Universal Circuit Simulator (QUCS) for a seven stepped SAW filters on substrate of relaxor based ferroelectric single crystals. An extremely large wideband SAW filter of 620 MHz at 1 GHz could be obtained due to large electromechanical coupling factor (K2~60%) when the substrate is poled along (111) plane, which is presently three times larger than that achieved by conventional piezoelectric material. The band rejection could be improved by adjusting static capacitance ratio of series and parallel arm resonators. In order to optimize overall properties of the ultra-wideband SAW filter, we have modified the structure of a conventional ladder-type filter by adding a resonator to series or parallel arm to form two new notches, which sacrifices some bandwidth, but could achieve large transition band, steep transition zone and also band rejection. Finally, we discussed the influence of quality factor on the insertion loss of the SAW filters.

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超宽带表面声波滤波器的设计

介绍了由谐振器组成的传统阶梯式表面声波滤波器的工作原理。利用相当通用电路模拟器(QUCS)建立了基于弛豫铁电单晶衬底的七阶声表面波滤波器的仿真模型。当衬底沿(111)平面极化时，由于具有较大的机电耦合系数(K2~60%)，可获得1ghz下620mhz的超大宽带声表面波滤波器，是目前传统压电材料的3倍。通过调整串联臂谐振器和并联臂谐振器的静电容比，可以改善带阻。为了优化超宽带SAW滤波器的整体性能，我们对传统阶梯型滤波器的结构进行了改进，在串联臂或并联臂上增加谐振器形成两个新的陷波，牺牲了一定的带宽，但可以实现大的过渡带、陡的过渡带和带抑制。最后，讨论了质量因子对声表面波滤波器插入损耗的影响。

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2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)

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