High velocity pseudosurface waves (HVPSAW)
High velocity pseudosurface waves (HVPSAW)
复制标题
高速赝表面波 (HVPSAW)
DOI：
10.1109/58.464840
复制
发表时间：
1995
期刊：
影响因子：
--
通讯作者：
E. Adler
中科院分区：
文献类型：
--
作者：
M. D. da Cunha;E. Adler
当前对用于移动的和个人通信系统的低损耗UHF滤波器的兴趣已经导致了许多基于伪SAW（PSAW）和SH模式的SAW器件。对于给定的线宽，这些滤波器可以在比基于SAW的滤波器更高的频率下操作，因为PSAW和SH模式速度可以显著高于对应的SAW速度。此外，对于某些取向，PSAW的衰减是可接受的小。本文讨论了独立高速伪声表面波（HVPSAW）模的存在性。HVPSAW示出具有接近于纵向体波速度的相速度，并且被准纵向极化。针对几种压电材料的电开路和分层金属短路条件描述了这种HVPSAW模式的性质。数值和实验数据讨论这些高速伪表面波的存在和属性。<<ETX>>
Current interest in low-loss UHF filters for use in mobile and personal communication systems has led to a number of pseudo-SAW (PSAW) and SH mode based SAW devices. These filters can operate at higher frequencies than SAW-based ones for a given line-width because PSAW and SH mode velocities can be significantly higher than corresponding SAW velocities. Furthermore for certain orientations the attenuation of the PSAW is acceptably small. In this paper the existence of an independent high-velocity pseudo-SAW (HVPSAW) mode is discussed. The HVPSAW is shown to have a phase velocity close to the longitudinal bulk wave velocity and to be quasi-longitudinally polarized. The nature of this HVPSAW mode is described for both electrically open-circuited and layered metallic short-circuited conditions for several piezoelectric materials. Numerical and experimental data are presented which discuss the existence and properties of these high-velocity pseudosurface waves.<<ETX>>