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Surface Acoustic Waves (SAW) is the acoustic wave that propagates along the surface of the substrate with amplitude decaying exponentially away from the surface. A basic SAW device consists of two IDT’s on a piezoelectric substrate such as quartz. Surface Acoustic Wave can be ... Mehr lesen
Electroacoustic resonators employing surface acoustic waves (SAW) are commercially widely used in RF filters, low noise frequency sources as well as various sensors. In all of these applications the resonance quality factor appears to be a limiting performance factor. Quite often ... Mehr lesen
Design of SAW devices needs the accurate study of the scattering fields, arising from the interaction of SAW with topographic irregularities. To solve this problem FE methods very perspective, because with its help one can take into account the actual geometry of the electrodes and ... Mehr lesen
Surface acoustic wave (SAW) devices are commonly used as wireless filters, resonators, and sensors. The confinement of acoustic energy near the surface of a piezoelectric substrate in a SAW sensor makes it highly sensitive for discerning surface perturbation. As sensors, SAW devices have ... Mehr lesen
This contribution is dedicated to numerical analysis of SAW propagation though 2D surface phononic crystal (PnC) and FE method is nowadays one of most common tool for such calculation. The device under investigation consists of two dispersive IDT and lattice of ferromagnetic pillars ... Mehr lesen
随着电子通信的不断发展和普及,对声表面波器件(SAW)的性能要求也逐渐提升。在器件不断变小,工作环境的不断恶劣的情况下,声表面波器件也需要更高的频率、更好的稳定性能以及更大的带宽等新的提升。对于传统的氮化铝/金刚石结构来说已经无法满足更高频率,更大带宽的要求,所以本文为了能设计具有更高的相速度和机电耦合系数的声表面波器件,使用comsol 有限元仿真中的MEMS模块,对掺钪的氮化铝薄膜进行了研究,通过实验证明氮化铝钪作为压电材料时能具有更好的特性。通过研究在四种激励模式下氮化铝/金刚石结构与氮化铝钪/金刚石结构随着压电材料厚度的变化 ... Mehr lesen
Finite element modelling of surgical transducers has been performed and is described. Ultrasonic transducers vibrating at around 25 kHz are used in orthopaedic surgery to cut bone. The high acoustic impedance of the metal blades used in these devices couples energy more efficiently to ... Mehr lesen
A novel type of tunable surface acoustic waves (SAW) filter based on 1D phononic crystal controlled by electric is field proposed. The tunability of proposed filter varied over a wide range: 1-20%. Basic idea is electrical controlled induced periodical domains in ferroelectric film based ... Mehr lesen
In this contribution, we simulate the optical response of piezoelectric planar optical microcavities (POMCs) under the modulation introduced by a propagating surface acoustic wave (SAW). The physical picture of the model is shown in Figure 1. A metallic interdigital transducer (IDT) is ... Mehr lesen
This work enunciates the principles of SAW design from a physical perspective, examining the standard engineering modelling assumptions in some detail. An integral form analytical expression based on 2D elastic isotropic theory is validated against a COMSOL Multiphysics® simulation, ... Mehr lesen