Minimum-loss short reflectors on 128 ̊ LiNbO3

Short reflectors operating at the fundamental and second harmonics on 128 ̊ LiNbO3

In this work, we study numerically the operation of surface acoustic wave (SAW) reflectors comprising a small number of electrodes on the 128 YX-cut lithium niobate (LiNbO3) substrate. The electrodes have a finite thickness, and they are either open circuited or grounded. The center-to-center distance between adjacent electrodes d corresponds roughly either to half of the characteristic wavelen...

Phases of the SAW reflection and transmission coefficients for short reflectors on 128 ̊ LiNbO3

Second-harmonic reflectors on 128 ̊ LiNbO3

In this work, we study theoretically the operation of long surface acoustic wave reflectors, comprising a large number of electrodes, at the fundamental and second harmonic frequencies on the 128 LiNbO3 substrate for various electrode thicknesses and metallization ratios. Numerical simulations utilizing tailored test structures and time gating indicate that the reflectivity of the second-harmon...

Propagation Characteristics of Surface Acoustic Waves in AlN/128°Y-X LiNbO3 Structures

In this study, propagation characteristics of surface acoustic waves in a layered piezoelectric structure (AlN/128°Y-X LiNbO3) are investigated. The phase velocity and coupling coefficient of the layered structure with interdigital transducers and/or metal thin films deposited at various interfaces will be calculated numerically. The effects of the polarity of 128°Y-X LiNbO3 on SAW characterist...

Maximum Measurement Range and Accuracy of SAW Reflective Delay Line Sensors

In a surface acoustic wave (SAW) wireless sensor with a reflective delay line structure, three reflectors are often used to eliminate 2π ambiguity of phase measurement. The maximum range of the measured parameter and the maximum accuracy have recently been attracting much research attention. In this paper, an analytical formula for all the factors influencing the measurement range and accuracy ...