Figure thereby 1.The working principle Inhibitors,Modulators,Libraries of the wireless sensor based on SAW reflective delay line.The first purpose of this paper is to describe the Love wave propagation along a substrate with larger piezoelectricity (41�� YX LiNbO3) with a polymer guiding layer (PMMA: stiffness modulus of 1.7 Inhibitors,Modulators,Libraries GPa and a density next of 1.17 g/cm3, giving a lower waveguide acoustic velocity of 1105 m/s [6]) on top of it, as shown in Figure 2 (a). A theoretical model of a Love wave propagating in a viscoelastic polymer layer deposited on a piezoelectric substrate was considered, and an analytical formula relating the attenuation coefficient of the Love wave and the viscoelastic parameters of the waveguide structure were established.
The complex dispersion relationship of the Love wave was studied, in which, the attenuation induced by the viscoelastic guiding layer was calculated, and it would provide as guidelines Inhibitors,Modulators,Libraries for the optimization structure of the Love wave devices.Figure 2.(a) The schematic of the Love wave reflective delay Inhibitors,Modulators,Libraries line. (b) The system coordinates of the theoretical Inhibitors,Modulators,Libraries model.Another aim of this paper was to determine the optimal design parameters of the SH SAW reflective delay line Inhibitors,Modulators,Libraries on 41�� YX LiNbO3 by COM models. Based on the simulated results, a 440 MHz Love wave reflective delay line with SPUDTs and three shorted grating reflectors was fabricated Inhibitors,Modulators,Libraries by standard photographic techniques.
41�� YX LiNbO3 was used for the piezoelectric substrate because it supports a SH SAW with a relatively high SH velocity and large electromechanical coupling coefficient Inhibitors,Modulators,Libraries K2 [7].
The basic idea of the SPUDT is to enhance the generated signal in the forward direction but reduce the signal in the reverse direction using the distributed reflection sources (��/4 reflection electrode), which suppress triple transit and reduce Entinostat insertion loss effectively [8]. Various thicknesses of PMMA are deposited onto the substrate to extract the optimal guiding layer thickness. Experimental data was consistent with the theoretical analysis.2.?Theoretical analysis2.1. Love wave modelFor the theoretical Cilengitide approach, the Love wave device can be considered as a multilayer composed of a semi-infinite piezoelectric substrate and a guiding layer.
The piezoelectric especially substrate acts as a mechanical support and allows generating elastic waves by IDTs. For Love wave in isotropic structure, solution was given by Royer et al.
[9]. In addition, Zimmermann et al. presented the weak piezoelectric Love wave structure like quartz [10]. Wang et al. described the Love wave propagation along the multi-layered structure as PMMA/SiO2/LiNbO3 [11].Kielczynski established the theory of Love waves propagating in a lossy viscoelastic layer promotion info deposited on an elastic substrate, in which the attenuation induced by the lossy guiding layer was described numerically [12].