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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Optimal cuts of langasite, La3Ga5SiO14 for SAW devices
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Optimal cuts of langasite, La3Ga5SiO14 for SAW devices

机译：用于SAW器件的最佳镧铁矿La3Ga5SiO14切割

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摘要

The results of a theoretical and experimental investigation of thenSAW propagation characteristics in an optimal region of langasitendefined by the Euler angles Φ from -15° to +10°, Θnfrom 120° to 165°, and Ψ from 20° to 45° arenpresented. Based on temperature coefficients of the elastic constantsnderived from experimental data, some optimal orientations of langasitencharacterized by high electromechanical coupling factor (k2),nzero power flow angle (PFA) and low or zero temperature coefficient ofnfrequency (TCF) were found. The SAW velocity in the region of interestnis highly anisotropic; this results in a significant amount ofndiffraction, which must be taken into account in the search fornorientations useful for SAW devices. An orientation havingnsimultaneously zero PFA, zero TCF, negligible diffraction, andnrelatively high piezoelectric coupling has been found and verifiednexperimentally. The experimental results are in excellent agreement withnthe calculated SAW characteristics. The frequency response of a SAWndevice fabricated on the optimal cut of langasite is presented andndemonstrates that high performance SAW filters can be realized on thisnoptimal cut of langasite
机译：给出了在由-15°至+ 10°的欧拉角Φ，120°至165°的θn和20°至45°的θ所定义的最佳兰斯滕区中SAW传播特性的理论和实验研究结果。根据实验数据得出的弹性常数的温度系数，找到了以高机电耦合系数（k2），n零功率流角（PFA）和n频率低或零温度系数（TCF）表征的兰氏合金的最佳取向。感兴趣区域中的声表面波速度是高度各向异性的。这会导致大量的衍射，在搜索对SAW设备有用的方向时必须将其考虑在内。已经发现并通过实验验证了同时具有零PFA，零TCF，可忽略的衍射和相对高的压电耦合的取向。实验结果与所计算的声表面波特性非常吻合。提出了一种基于最佳菱沸石制备的SAWn器件的频率响应，并证明了在最佳菱沸石制备上可以实现高性能SAW滤波器。

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