Langasite同形物双旋切的测量

Yoonkee Kim
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引用次数: 2

摘要

本文报道了由langasite同晶材料制成的体声波谐振器的双旋转切口的测量性质。测试用平凸坯料(直径14 mm, 2度,标称10 MHz第5 OT)制作了四种不同的切割:(theta = 10度,phi = 10度),(theta = 10度,phi = 20度),(theta = 20度,phi = 10度),(theta = 20度,phi = 20度),(theta = 20度,phi = 20度)。使用阻抗分析仪,我们能够测量c和b模式的强激发基频和第三泛音,以及它们的非谐波模式,正如它们的低运动电阻所证明的。a模被弱激发,但也可以被测量。通过求解克里斯托费尔方程,得到了双旋转切口的特征模态速度和压电耦合系数的理论值。将理论值与实测值进行了比较。频率-温度(f-t)特性也在-55℃至85℃的温度范围内进行了测量。c模和b模的f-t曲线呈抛物线型
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Measurements of Doubly-Rotated-Cuts of Langasite Isomorph
In this paper, we report the measured properties of doubly-rotated cuts of bulk-acoustic-wave resonators made of a langasite isomorph material. Test resonators with planoconvex blanks (14 mm diameter, 2 diopter, nominal 10 MHz 5th OT) were fabricated for four different cuts: (thetas = 10deg, phi = 10deg), (thetas = 10deg, phi = 20deg), (thetas = 20deg, phi = 10deg), (thetas = 20deg, phi = 20deg). Using an impedance analyzer, we were able to measure strongly excited fundamental and 3rd overtones of the c- and b-modes, along with their anharmonic modes, as evidenced by their low motional resistances. The a-modes were weakly excited but could also be measured. The theoretical values of eigenmode velocities and piezoelectric coupling coefficients of the doubly-rotated cuts were obtained by solving Christoffel equations. The theoretical values were compared to the measured ones. The frequency-temperature (f-t) characteristics were also measured in the temperature range of -55 degC to 85 degC. The f-t curves of the c- and b-modes showed parabolic characteristics
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