Rigorous analysis of finite SAW devices with arbitrary electrode geometries

Ventura, P.; Hodé, J.M.; Lopes, Bruno

doi:10.1109/ultsym.1995.495578

Cited by 75 publications

(39 citation statements)

References 4 publications

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“…[22][23][24][25] The actuation of the droplet strongly depends on the surface vibration, therefore, in order to investigate the vibration characteristics of the SH-SAW on the 36° Y-X LiTaO3 surface, an FEM/BEM analysis was conducted to simulate the surface vibration of the SH-SAW device. The aforementioned structural parameters were adopted in the simulation in the absence of droplet and CYTOP thin layer.…”

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confidence: 99%

Vertical jetting induced by shear horizontal leaky surface acoustic wave on 36° Y-X LiTaO3

Quan

Luo

et al. 2017

Applied Physics Letters

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Shear horizontal surface acoustic waves (SH-SAWs) have been regarded as good candidates for liquid sensing applications but are inefficient in fluid manipulation due to a minimal fluid coupling between the fluid and acoustic waves. However, in this letter, a vertical jetting function was realized using the SH-SAW generated from a 36° Y-X LiTaO3 SAW device. The jetting of the droplet induced by the SH-SAWs was observed nearly along the vertical direction, and the aspect ratio of the liquid beam is proportional to the applied power before breaking up, which is dramatically different from those generated from the conventional Rayleigh SAWs. By conducting theoretical simulation and experimental investigation on the SH-SAWs systematically, we concluded that the wave/energy pressure dissipated into the sessile droplets causes this vertical ejection on the device surface.

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confidence: 99%

Vertical jetting induced by shear horizontal leaky surface acoustic wave on 36° Y-X LiTaO3

Quan

Luo

et al. 2017

Applied Physics Letters

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“…The divergence of charge density distribution at the electrode edges complicates the solution of (8). Conventional numerical methods of this case converge slowly and dramatically increase duration of calculations.…”

Section: Fundamental and Harmonic Operation Analysis Of Hfm Transducersmentioning

confidence: 99%

“…On both sides of the central electrode, the array of passive electrodes with potential Φ en  j = 0 V, j = 1, 2,… is arranged. Out of charge distribution analysis using (8) shows that the normalized charge density under a given electrode depends only on the dimensions and potential of that electrode and its nearest and next-nearest neighbors (Fig. 5).…”

Section: Approximation Error Analysismentioning

confidence: 99%

“…However, there is no general analytic procedure for calculation of the IDT characteristics which is suitable for arbitrary nonperiodic electrode structures, so solving the integral equations with the electrical and mechanical boundary conditions is achieved using numerical methods. Using Chebyshev interpolation of the charge distribution, the concept of semi-infinite Green's function, and the finite element method for taking into account the mechanical perturbation of electrodes, rigorous numerical model for 2D finite transducers analysis, including precise charge distribution simulation on electrodes of finite structures up to 200 electrodes has been presented in [8]. As mentioned in [8], in order to limit the CPU time, the development of powerful methods to integrate the semi-infinite Green's function is the most relevant.…”

Section: Introductionmentioning

confidence: 99%

“…Using Chebyshev interpolation of the charge distribution, the concept of semi-infinite Green's function, and the finite element method for taking into account the mechanical perturbation of electrodes, rigorous numerical model for 2D finite transducers analysis, including precise charge distribution simulation on electrodes of finite structures up to 200 electrodes has been presented in [8]. As mentioned in [8], in order to limit the CPU time, the development of powerful methods to integrate the semi-infinite Green's function is the most relevant. As shown in this work, the same applies to the simplified methods that use only electrostatic Green's function contribution.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Initial Design and Quick Analysis of SAW Ultra–Wideband HFM Transducers

Janeliauskas¹,

Markevičius²,

Navikas³

et al. 2017

RADIOENGINEERING

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Abstract. This paper presents techniques for initial design and quick fundamental and harmonic operation analysis of surface acoustic waves ultra-wideband hyperbolically frequency modulated (HFM) interdigital transducer (IDT KeywordsSurface acoustic wave (SAW), hyperbolically frequency modulated waveforms (HFM), interdigital transducer (IDT), quasi-static method, Chebyshev polynomial approximation, Green's function, interdigital chirp filter, harmonics' operation

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Surface Acoustic Wave Devices

Morgan

2005

Encyclopedia of RF and Microwave Engineering

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A surface‐acoustic‐wave (SAW) device employs an acoustic wave guided along the surface of a piezoelectric crystal, in which the stresses and strains of the wave are coupled to electric fields. The wave has a low velocity, typically 3500 m/s, and propagates with low attenuation. These features enable compact low‐loss devices to be developed for electronics applications at frequencies up to several gigahertz. Arrays of metal electrodes are used to generate, detect, or reflect the waves. This technology has enormous versatility because standard lithographic techniques can be used to fabricate almost arbitrary geometries. This article summarizes the nature of surface waves and some relevant propagation effects, including diffraction. The interdigital transducer, used in all these devices for wave generation, is described. A survey of suitable materials is given, including quartz, lithium niobate, and lithium tantalate. Transversal bandpass filters are weighted using apodisation or withdrawal weighting. They are widely used in TV receivers, as well as in professional equipment which calls for very high‐performance devices. For radar, SAW pulse compression filters perform a correlation operation, increasing the range capability. Other devices perform correlation for spread‐spectrum communication waveforms; an example is the SAW nonlinear convolver, which is capable of instantaneous programmability. For mobile telephony there has been a strong demand for miniature low‐loss bandpass filters, and a wide variety of novel SAW devices have been developed. For example, impedance element filters give 1 dB loss at 900 MHz, with 30 MHz bandwidth and a package size of 2×2 mm 2 . For IF CDMA filters, a modified form of the transversal filter, called the R‐SPUDT (resonant single‐phase unidirectional transducer), enables both low loss and small size to be obtained. For GSM IF circuits, transverse‐coupled resonator filters have been developed to give a very narrow bandwidth of 200 kHz. The article concludes with a superficial survey of the theory of these devices.

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Rigorous analysis of finite SAW devices with arbitrary electrode geometries

Cited by 75 publications

References 4 publications

Vertical jetting induced by shear horizontal leaky surface acoustic wave on 36° Y-X LiTaO3

Vertical jetting induced by shear horizontal leaky surface acoustic wave on 36° Y-X LiTaO3

Initial Design and Quick Analysis of SAW Ultra–Wideband HFM Transducers

Surface Acoustic Wave Devices

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