Dokument-ID Dokumenttyp Verfasser/Autoren Herausgeber Haupttitel Abstract Auflage Verlagsort Verlag Erscheinungsjahr Seitenzahl Übergeordneter Titel Übergeordneter Titel Band Schriftenreihe Titel Schriftenreihe Bandzahl ISBN Konferenzname Heftnummer Erste Seite Letzte Seite URN DOI Institute
OPUS4-3928 misc Mayer, Andreas; Mayer, Elena; Mayer, Markus; Ruile, Werner SAW-Vorrichtung mit unterdrücktem Parasitärsignal (DE102017110233A1) In einer SAW-Vorrichtung, welche einen SAW-Chip umfasst, der einen SAW-Wandler aufweist, welcher innerhalb einer ersten Signalleitung angeordnet ist, werden Parasitärsignale infolge höherer Harmonischer der Betriebsfrequenz der SAW-Vorrichtungen durch Kompensationsmittel elektrisch beseitigt, welche zumindest eine zweite Signalleitung mit Mitteln zum Erzeugen eines Aufhebungssignals, das im Vorzeichen oder in der Phase vom Parasitärsignal verschieden ist, oder eine Nebenschlussleitung zum elektrischen Verbinden des SAW-Wandlers mit einer rückseitigen Metallisierung des SAW-Chips umfassen. 2018 15 Fakultät Betriebswirtschaft und Wirtschaftsingenieurwesen (B+W)
OPUS4-2291 Konferenzveröffentlichung Mayer, Andreas; Mayer, Elena; Mayer, Markus; Jäger, Philipp M.; Ruile, Werner; Bleyl, Ingo; Wagner, Karl Full 2D-FEM calculations of third-order intermodulations in SAW devices In a recent paper it has been shown that the effective nonlinear constant which is used in a P-Matrix approach to describe third-order intermodulation (IMD3) in surface acoustic wave (SAW) devices can be obtained from finite element (FEM) calculations of a periodic cell using nonlinear tensor data [1]. In this paper we extend this FEM calculation and show that the IMD3 of an infinite periodic array of electrodes on a piezoelectric substrate can be directly simulated in the sagittal plane. This direct approach opens the way for a FEM based simulation of nonlinearities for finite and generalized structures avoiding the simplifications of phenomenological approaches. 2016 4 Ultrasonic Symposium 10.1109/ULTSYM.2016.7728469 Fakultät Betriebswirtschaft und Wirtschaftsingenieurwesen (B+W)
OPUS4-3843 misc Mayer, Markus; Ruile, Werner; Mayer, Elena; Mayer, Andreas SAW Device with Suppressed Parasitic Signal (WO002018206264A1) In a SAW device comprises a SAW chip bearing a SAW transducer arranged within a first signal line parasitic signals due to higher harmonics of the operating frequency of the SAW devices are electrically eliminated by compensating means comprising at least one second signal line having means for producing a cancelling signal different in sign or phase to the parasitic signal, or a shunt line to electrically connect the SAW transducer to a back side metallization of the SAW chip. 2018 36 Fakultät Betriebswirtschaft und Wirtschaftsingenieurwesen (B+W)
OPUS4-1436 unpublished Mayer, Andreas; Mayer, Elena; Mayer, Markus; Jäger, Philipp M.; Ruile, Werner; Bleyl, Ingo; Wagner, Karl Effective Nonlinear Constants for SAW Devices from FEM Calculations 2015 4 Proceedings of the 2015 IEEE Ultrasonics Symposium 10.1109/ULTSYM.2015.0055. Fakultät Betriebswirtschaft und Wirtschaftsingenieurwesen (B+W)
OPUS4-1583 Konferenzveröffentlichung Mayer, Markus; Ruile, Werner; Johnson, John; Kiwitt, Jürgen; San Jose, Romeo; Schmidhammer, Edgar; Bleyl, Ingo; Wagner, Karl; Mayer, Andreas; Mayer, Elena Application of a rigorous nonlinear P-matrix method to the simulation of third order intermodulation in test devices and duplexers 2014 3 Proceedings of the 2014 IEEE Ultrasonics Symposium 787 790 10.1109/ULTSYM.2014.0193 Fakultät Betriebswirtschaft und Wirtschaftsingenieurwesen (B+W)
OPUS4-3305 Referierter Artikel Chauhan, Vikrant; Mayer, Markus; Mayer, Elena; Ruile, Werner; Ebner, Thomas; Bleyl, Ingo; Wagner, Karl; Weigel, Robert; Mayer, Andreas; Hagelauer, Amelie Investigation on Third-Order Intermodulation Distortions due to Material Nonlinearities in TC-SAW Devices Nonlinearity can give rise to intermodulation distortions in surface acoustic wave (SAW) devices operating at high input power levels. To understand such undesired effects, a finite element method (FEM) simulation model in combination with a perturbation theory is applied to find out the role of different materials and higher order nonlinear tensor data for the nonlinearities in such acoustic devices. At high power, the SAW devices containing metal, piezoelectric substrate, and temperature compensating (TC) layers are subject to complicated geometrical, material, and other nonlinearities. In this paper, third-order nonlinearities in TC-SAW devices are investigated. The materials used are LiNbO 3 -rot128YX as the substrate and copper electrodes covered with a SiO 2 film as the TC layer. An effective nonlinearity constant for a given system is determined by comparison of nonlinear P-matrix simulations to third-order intermodulation measurements of test filters in a first step. By employing these constants from different systems, i.e., different metallization ratios, in nonlinear periodic P-matrix simulations, a direct comparison to nonlinear periodic FEM-simulations yields scaling factors for the materials used. Thus, the contribution of the different materials to the nonlinear behavior of TC-SAW devices is obtained and the role of metal electrodes, substrate, and TC film are discussed in detail. 2018 10 IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 65 10 1914 1924 10.1109/TUFFC.2018.2832283 Fakultät Betriebswirtschaft und Wirtschaftsingenieurwesen (B+W)
OPUS4-4530 Konferenzveröffentlichung Rogall, Olga; Feil, Niclas M.; Ding, Anli; Mayer, Elena; Pupyrev, Pavel Dmitrievich; Lomonosov, Alexey M.; Žukauskaitė, Agnė; Ambacher, Oliver; Mayer, Andreas Determining Elastic Constants of AlScN Films on Silicon Substrates by Laser Ultrasonics Laser ultrasound was used to determine dispersion curves of surface acoustic waves on a Si (001) surface covered by AlScN films with a scandium content between 0 and 41%. By including off-symmetry directions for wavevectors, all five independent elastic constants of the film were extracted from the measurements. Results for their dependence on the Sc content are presented and compared to corresponding data in the literature, obtained by alternative experimental methods or by ab-initio calculations. 2020 4 2020 Symposium Proceedings 978-1-7281-5448-0 (digital) 10.1109/IUS46767.2020.9251632 Fakultät Betriebswirtschaft und Wirtschaftsingenieurwesen (B+W)
OPUS4-2665 misc Chauhan, Vikrant; Mayer, Andreas; Mayer, Elena; Ruile, Werner; Ebner, Thomas Role of metal electrodes in the generation of third order nonlinearities in TC-SAW devices In the present work, nonlinearities in temperature compensating (TC) SAW devices are investigated. The materials used are LiNbO3-rot128YX as the substrate and Copper electrodes covered with a SiO2-layer as the compensating layer. In order to understand the role of these materials for the nonlinearities in such acoustic devices, a FEM simulation model in combination with a perturbation approach [1] is applied. The nonlinear tensor data of the different materials involved in TC-SAW devices have been taken from literature, but were partially modified to fit experimental data by introducing scaling factors. An effective nonlinearity constant is determined by comparison of nonlinear P-matrix simulations to IMD3 measurements of test filters. By employing these constants in nonlinear periodic P-matrix simulations a direct comparison to nonlinear periodic FEM-simulations yields the scaling factors for the material used. Thus, the contribution of different materials to the nonlinear behavior of TC-SAW devices is obtained and the role of metal electrodes is discussed in detail Washington IEEE 2017 1 2017 IEEE International Ultrasonics Symposium (IUS) 1 1 urn:nbn:de:bsz:ofb1-opus4-26656 10.1109/ULTSYM.2017.8092066 Fakultät Betriebswirtschaft und Wirtschaftsingenieurwesen (B+W)
OPUS4-699 Referierter Artikel Sokolova, Elena; Kovalev, Alexander; Mayer, Andreas Second-order nonlinearity of wedge acoustic waves in anisotropic media Guided acoustic waves localised at the apex of an infinite elastic wedge are influenced by second-order nonlinearity. This gives rise to a nonlinear term in the integro-differential equation describing waveform evolution at the apex of the wedge. 2012 6 Wave motion : an international journal reporting research on wave phenomena 50 2 246 252 Fakultät Betriebswirtschaft und Wirtschaftsingenieurwesen (B+W)
OPUS4-3302 Teil eines Buches Pupyrev, Pavel Dmitrievich; Lomonosov, Alexey M.; Sokolova, Elena; Kovalev, Alexander; Mayer, Andreas Altenbach, Holm; Pouget, Joël; Rousseau, Martine; Collet, Bernard; Michelitsch, Thomas Nonlinear Acoustic Wedge Waves Among the various types of guided acoustic waves, acoustic wedge waves are non-diffractive and non-dispersive. Both properties make them susceptible to nonlinear effects. Investigations have recently been focused on effects of second-order nonlinearity in connection with anisotropy. The current status of these investigations is reviewed in the context of earlier work on nonlinear properties of two-dimensional guided acoustic waves, in particular surface waves. The role of weak dispersion, leading to solitary waves, is also discussed. For anti-symmetric flexural wedge waves propagating in isotropic media or in anisotropic media with reflection symmetry with respect to the wedge's mid-plane, an evolution equation is derived that accounts for an effective third-order nonlinearity of acoustic wedge waves. For the kernel functions occurring in the nonlinear terms of this equation, expressions in terms of overlap integrals with Laguerre functions are provided, which allow for their quantitative numerical evaluation. First numerical results for the efficiency of third-harmonic generation of flexural wedge waves are presented. Cham Springer 2018 23 Generalized Models and Non-classical Approaches in Complex Materials 2 (Advanced Structured Materials : STRUCTMAT) 90 978-3-319-77503-6 161 184 10.1007/978-3-319-77504-3_8 Fakultät Betriebswirtschaft und Wirtschaftsingenieurwesen (B+W)
OPUS4-4532 Referierter Artikel Pupyrev, Pavel Dmitrievich; Nedospasov, Ilya; Sokolova, Elena; Mayer, Andreas Surface acoustic waves confined to a soft layer between two stiff elastic quarter-spaces Propagation of acoustic waves is considered in a system consisting of two stiff quarter-spaces connected by a planar soft layer. The two quarter-spaces and the layer form a half-space with a planar surface. In a numerical study, surface waves have been found and analyzed in this system with displacements that are localized not only at the surface, but also in the soft layer. In addition to the semi-analytical finite element method, an alternative approach based on an expansion of the displacement field in a double series of Laguerre functions and Legendre polynomials has been applied. It is shown that a number of branches of the mode spectrum can be interpreted and remarkably well described by perturbation theory, where the zero-order modes are the wedge waves guided at a rectangular edge of the stiff quarter-spaces or waves guided at the edge of a soft plate with rigid surfaces. For elastic moduli and densities corresponding to the material combination PMMA-silicone-PMMA, at least one of the branches in the dispersion relation of surface waves trapped in the soft layer exhibits a zero-group velocity point. Potential applications of these 1D guided surface waves in non-destructive evaluation are discussed. ScienceDirect 2021 NaN Wave Motion 101 102672-1 102672-6 10.1016/j.wavemoti.2020.102672 Fakultät Betriebswirtschaft und Wirtschaftsingenieurwesen (B+W)
OPUS4-3581 Referierter Artikel Shrena, Ismail; Eisele, David; Bardong, Jochen; Mayer, Elena; Reindl, Leonhard Michael High-precision signal processing algorithm to evaluate SAW properties as a function of temperature This paper presents a signal processing algorithm which accurately evaluates the SAW properties of a substrate as functions of temperature. The investigated acoustic properties are group velocity, phase velocity, propagation loss, and coupling coefficient. With several measurements carried out at different temperatures, we obtain the temperature dependency of the SAW properties. The analysis algorithm starts by reading the transfer functions of short and long delay lines. The analysis algorithm determines the center frequency of the delay lines and obtains the delay time difference between the short and long delay lines. The extracted parameters are then used to calculate the acoustic properties of the SAW material. To validate the algorithm, its accuracy is studied by determining the error in the calculating delay time difference, center frequency, and group velocity. 2013 8 IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 60 4 805 813 10.1109/TUFFC.2013.2629 Fakultät Elektrotechnik und Informationstechnik (E+I) (bis 03/2019)
OPUS4-4531 Konferenzveröffentlichung Feil, Niclas M.; Mayer, Elena; Christian, Björn; Ding, Anli; Žukauskaitė, Agnė; Ambacher, Oliver Novel Method for Extracting Material Constants of Epitaxial Wurtzite AlScN Films on Sapphire Using Higher Order Surface Acoustic Wave Modes Partial substitution of Al atoms with Sc in wurtzite AlN crystals increases the piezoelectric constants. This leads to an increased electromechanical coupling, which is required for high bandwidths in piezo-acoustic filters. The crystal bonds in Ah-xScxN (AlScN) are softened as function of Sc atomic percentage x, leading to reduction of phase velocity in the film. Combining high Sc content AlScN films with high velocity substrates favors higher order guided surface acoustic wave (SAW) modes [1]. This study investigates higher order SAW modes in epitaxial AlScN on sapphire (Al2O3). Their dispersion for Pt metallized epitaxial AlScN films on Al2O3was computed for two different propagation directions. Computed phase velocity dispersion branches were experimentally verified by the characterization of fabricated SAW resonators. The results indicated four wave modes for the propagation direction (0°, 0°, 0°), featuring 3D polarized displacement fields. The sensitivity of the wave modes to the elastic constants of AlScN was investigated. It was shown that due to the 3D polarization of the waves, all elastic constants have an influence on the phase velocity and can be measured by suitable weighting functions in material constant extraction procedures. 2020 4 2020 Symposium Proceedings 978-1-7281-5448-0 (digital) 10.1109/IUS46767.2020.9251767 Fakultät Betriebswirtschaft und Wirtschaftsingenieurwesen (B+W)