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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >BAW temperature sensitivity and coupling in langanite
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BAW temperature sensitivity and coupling in langanite

机译：BAW中的温度敏感性和耦合

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摘要

One of the new materials belonging to the trigonal class 32, to which quartz belongs, is langanite (LGN, La/sub 3/Ga/sub 5.5/Nb/sub 0.5/O/sub 14/). High-quality LGN single crystals are now available, and, although similar in composition and structure to langasite (LGS, La/sub 3/Ga/sub 5/SiO/sub 14/), LGN has smaller thermal expansion coefficients and comparable piezoelectric constants to LGS. These are desirable material properties for both SAW and BAW applications that require low frequency dependence on temperature. This paper examines in detail the LGN characteristics: phase velocity, temperature coefficient of frequency (TCF), electromechanical coupling coefficient, and power flow angle for both singly and doubly rotated plate cuts. Contour plots of these characteristics are constructed, revealing orientation regions where zero TCF and high coupling exist and suggesting potentially interesting cuts for practical BAW device design. Temperature compensated cut regions with coupling coefficients as high as 0.16 are predicted, which is twice the value for AT-cut quartz, along with a temperature compensated cut with cubic behavior around room temperature for one of the sets of material constants used. With such desirable properties, LGN is a promising candidate material for BAW applications requiring low temperature sensitivity with superior bandwidth characteristics due to its values of coupling coefficient larger than quartz. Several other orientations with low TCF and high coupling are also identified.
机译：属于石英的属于三角类32的新材料之一是锰铝矿（LGN，La / sub 3 / Ga / sub 5.5 / Nb / sub 0.5 / O / sub 14 /）。现在可以得到高质量的LGN单晶，尽管其成分和结构与硅酸铝（LGS，La / sub 3 / Ga / sub 5 / SiO / sub 14 /）相似，但LGN的热膨胀系数较小，并且压电常数相当到LGS。对于要求低频依赖温度的SAW和BAW应用而言，这些都是理想的材料特性。本文详细研究了LGN的特性：单旋转和双旋转钢板切口的相速度，频率温度系数（TCF），机电耦合系数和功率流角。构造了这些特性的轮廓图，揭示了零TCF和高耦合存在的取向区域，并为实际的BAW器件设计提出了潜在的有趣的切入点。预测了耦合系数高达0.16的温度补偿切割区域，这是AT切割石英值的两倍，并且对于所用的一组材料常数之一，温度补偿切割区域在室温附近具有立方行为。具有如此理想的性能，LGN因其耦合系数值大于石英而成为需要低温敏感性和出色带宽特性的BAW应用的有前途的候选材料。还确定了其他几种具有低TCF和高耦合的方向。

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