This paper discussed the basic form of the wave-vector surface and normal mode of nonreciprocal gyrotropic dielectric tensor.
本文讨论了这类非互易旋光张量下的波矢面及简正模的基本形式。
Because its driving signal is surface acoustic wave, thus it overcomes the shortcomings of complex structure, difficult fabrication and miniaturization in normal ultrasonic motor.
由于其驱动信号是可以由结构简单的叉指电极激发的声表面波，因而克服了一般的超声马达结构复杂，制造困难以及小型化困难等缺点。
Because its driving signal is surface acoustic wave, thus it overcomes the shortcomings of complex structure, difficult fabrication and miniaturization in normal ultrasonic motor.
由于其驱动信号是可以由结构简单的叉指电极激发的声表面波，因而克服了一般的超声马达结构复杂，制造困难以及小型化困难等缺点。
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