Finite-element analysis of scattering parameters of surface acoustic wave bandpass filter formed on barium titanate thin film

Abstract

The frequency dependence of scattering parameters of interdigital surface acoustic wave transducers placed on ferroelectric barium titanate (BaTiO 3 ) epitaxial film in c-phase coated over magnesium oxide has been studied using the finite-element method (FEM) approach along with the perfectly matched layer (PML) technique. The interdigital transducer which has a comb-like structure with aluminum electrodes excites the mechanical wave. The distance between the fingers allows tuning the frequency properties of the wave propagation. The magnesium oxide is taken as the substrate. The two-dimensional model of two-port surface acoustic wave filter is created to calculate scattering parameters and to show how to design the fixture in COMSOL TM . Some practical computational challenges of finite element modeling of SAW devices in COMSOL TM are shown. The effect of lattice misfit strain on acoustic properties of heterostructures of BaTiO 3 epitaxial film in c-phase at room temperature is discussed in present article for two lowfrequency surface acoustic resonances. ARTICLE HISTORY

Highly coupled leaky surface acoustic wave on hetero acoustic layer structures based on ScAlN thin films with a c-axis tilt angle

“…With the arrival of the 5G era, acoustic wave-filtering components have more stringent requirements, such as for a higher electromechanical coupling coefficient (K 2 ), higher frequencies, and a higher Q factor or admittance ratio, etc. [1][2][3][4][5][6][7][8] For SAW devices, those characteristics mainly depend on their piezoelectric substrates.…”

Smart structures, materials and nano technology in engineering

“…The present IJSNM special issue spans volume 9's issue 1 [1][2][3][4] and issue 2 [5][6][7][8]; it contains 8 papers [1][2][3][4][5][6][7][8] that were extended and revised (some of them twice) according to 3 anonymous and independent peer reviewers' reports. They were spontaneously submitted following an open call to the participants of the joint 8th SMART and 6th SMN held in Madrid (Spain) from 5 to 8 June 2017.…”

“…It was closed by a technical visit to a 'design and manufacturing of aero-structures and components' supplier of renowned international (multi-national) aircraft manufacturers. Hereafter are briefly described the 8 papers of the present IJSNM special issue spanning volume 9's issue 1 [1][2][3][4] and issue 2 [5][6][7][8].…”

“…The fourth contribution [4] is a focused review on the less known and investigated research topic of field-dependent nonlinear piezoelectricity. While the 5th paper [5], on finite element analysis scattering of surface acoustic wave (SAW) bandpass filter on Barium Titanate thin film in cubic phase, was not presented in SMART/SMN 2017, it represents well its 'MS10: SAW passive and wireless sensors for structural health monitoring applications'. Beside above SS and MS05, the tendency of embedding smart materials, instead of classically surface-bonding them on host structures, was the focus of 'GS2: Embedded smart materials technology' which sample representative is the 6th contribution [6] on the temperature and strain registration by fibre optic strain sensor in the polymer composite materials manufacturing.…”

“…As a closure, we are very thankful to the authors for their very interesting contributions and to the reviewers for their meticulous reports. Besides, the organizers of SMART and SMN 2017 are very thankful to the editor-in-chief, Professor Jinsong Leng, and to the publisher, Sage Publications, for their supports to these events by dedicating the present special issue (spanning volume 9's issue 1 [1][2][3][4] and issue 2 [5][6][7][8]) to sample contributions from those presented therein and by publishing it in open access format with weaved Articles Processing Charges (APC).…”