Consultez les proceedings de la Conference COMSOL 2024
Lithium niobate (LiNbO3) possesses unique combination of material properties such as: high electro-optic and elasto-optic coefficients and strong piezoelectricity, enabling integration of optical and acoustic functionalities within a single material, paving the way for advanced ... En savoir plus
传统声表面波（SAW）滤波器技术存在Q值低（＜1000）和频率随工作温度漂移的特性，已经难以满足频段越来越拥挤的5G时代射频终端对滤波器的要求，因此，传统的SAW滤波器必须向具备高频率-温度稳定性的温度补偿型SAW（TC-SAW）滤波器发展。鉴于SiO2层与压电层具有相反温度弹性的特性，且该工艺比另一种键合温补方法简单、成本低，是目前国内外声表厂家广泛采用的一种温补方式。 对该种TC-SAW谐振器进行COMSOL建模仿真，研究SiO2层、指条层厚度对SAW波导的影响，以及材料参数和结构尺寸与SAW滤波器频率温度系数（TCF）及机电耦合系数之间的关系 ... En savoir plus
Surface acoustic wave gas sensors use a chemically sensitive resistive layer to detect gas concentration. The resistivity of the sensing material, the sensing layer thickness, and the spacer layer thickness all affect the surface wave propagation velocity. Existing analytic theory ... En savoir plus
Surface acoustic wave (SAW) devices based on Rayleigh wave, shear wave, love wave, acoustic plate mode (APM) wave and flexural plate wave have been explored for sensors, actuators and telecommunication applications. An interdigital transducer (IDT) is a metallic comb-like structure ... En savoir plus
In this paper, we discuss a simplified finite element method simulation of surface acoustic wave (SAW) delay line hydrogen sensor using COMSOL Multiphysics. A delay line SAW sensor consists of a transmitting interdigital transducer (IDT) and a receiving IDT separated by a few ... En savoir plus
Volatile Organic Compounds (VOC) are a wide range of carbon based organic chemical compounds which evaporate easily at room temperature referred as volatile in nature. Human exhaled breathe consists of carbon dioxide (CO2) along with more than 3000 Volatile Organic Compounds exists like ... En savoir plus
Introduction Leaky Surface Acoustic Wave (LSAW) resonators in rotated Y-X cut Lithium Tantalate (LiTaO3) are widely used for resonator based ladder filters in telecommunication applications. These devices make use of quasi- shear waves confined to the surface of the piezoelectric layer ... En savoir plus
Surface Acoustic Wave devices are classic examples of Micro Electro Mechanical Systems (MEMS). These devices basically utilize inter-digitated electrodes (IDE) and a piezoelectric layer deposited over a substrate. The input IDT is supplied with alternating voltage and because of this, ... En savoir plus
SAW devices, in which acoustic wave travels along the surface of a material, are used as filters, oscillators and delay lines in electronic circuits. However, recent research [1] revealed that bulk acoustic waves (BAW) can be nonlinearly generated in LiNO3 SAW device if the drive level ... En savoir plus
Microfluidic devices based on acoustophoresis have garnered significant attention due to their potential applications in biomedical and chemical analysis. Acoustophoresis employs acoustic waves to manipulate and separate particles within microfluidic channels according to their size, ... En savoir plus