Analysis of SAW Scattering With Discontinuous Periodic Gratings Using Travelling Wave Excitation and Hierarchical Cascading Technique

Huang, Yulin; Bao, Jingfu; Zhang, Benfeng; Qiu, Luyan; Omori, Tatsuya; Hashimoto, Ken–ya

doi:10.1109/tuffc.2019.2911133

Cited by 6 publications

(5 citation statements)

References 18 publications

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“…Furthermore, other advantages exists: (a) capability to reuse intermediate results [43] to investigate variation of device characteristics with some design parameters, by running parameter scans, (b) capability to simulate semi-infinite structures [44], and (c) realization of damping mechanisms [43], [44], [45] for cases where PML does not work properly.…”

Section: Advanced Fem Simulationmentioning

confidence: 99%

“…HCT is also a new theoretical tool for researchers to tackle various problems on SAW/BAW excitation and scattering including those believed to be impossible. An example is SAW scattering analysis at irregularity inserted in between two semi-infinitely long gratings [44] and that at IDT finger tips [48]. To the best of the authors' knowledge, such kinds of analysis have never been accomplished and reported before.…”

Section: Advanced Fem Simulationmentioning

confidence: 99%

“…The analysis employed the traveling wave excitation source (TWES) [50]. It should be noted that HCT is easily applicable to TWES calculation without spoiling any advantages of HCT [44], [45].…”

Section: Advanced Fem Simulationmentioning

confidence: 99%

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From Microwave Acoustic Filters to Millimeter-Wave Operation and New Applications

et al. 2023

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This paper reviews the latest developments in microwave acoustic wave devices. After an introduction and brief history of bulk acoustic wave (BAW) and surface acoustic wave (SAW) devices, a review is given for guided SAWs and XBARs -two new technologies, which are promising for future 5G applications. Following this, we discuss recent simulation techniques, such as 3D finite element method (3D FEM) and simulation of nonlinearities, as well as filter synthesis. Next, a review on tunable and reconfigurable acoustics is given. Finally, we present the latest developments in microwave acoustics for millimeter-wave (mm-wave) operation as well as BAW oscillators.INDEX TERMS Bulk acoustic wave (BAW) devices, filter, filter-synthesis, front-end, high power, MTT 70th Anniversary Special Issue, multiplexer, nonlinearity, resonator, surface acoustic wave (SAW) devices.

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Section: Advanced Fem Simulationmentioning

confidence: 99%

Section: Advanced Fem Simulationmentioning

confidence: 99%

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From Microwave Acoustic Filters to Millimeter-Wave Operation and New Applications

et al. 2023

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“…Full three dimensional (3D) finite element method (FEM) was also applied to the device structure, and validity of the design was confirmed. 14) Because of the rectangular electrode shape, the hierarchical cascading technique (HCT) [15][16][17][18][19][20][21][22][23][24][25][26] makes the full 3D FEM analysis possible. It was also shown that the edge ratio W x /W y close to unity, namely, square-shape is preferable in total due to the trade-off between Q and spurious modes.…”

Section: Introductionmentioning

confidence: 99%

Field analyses of thickness shear bulk acoustic resonators with different electrode edge ratio using full three dimensional finite element method simulation

He¹,

Wong²,

Wu³

et al. 2022

Jpn. J. Appl. Phys.

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This paper is aimed at revealing origins of spurious resonances and Q deterioration of thickness shear bulk acoustic resonators with the edge ratio Wx/Wy of rectangular electrodes by field analyses. Here, Wx and Wy are distances between side edges giving the broadband and standard piston designs, respectively. The field distribution is calculated by applying traceback technique to the full three-dimensional finite element method based on hierarchical cascading technique, its variation with the edge ratio is studied in detail in assistance with the wavenumber domain analysis. The result indicates that the mode conversion and leakage occur at the bump region causing Q reduction, and generated hybrid modes cause spurious resonances. The former is significant when Wx/Wy is large when the latter becomes obvious when Wx/Wy is small.

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“…One candidate of this excess loss is acoustic scattering at structural discontinuities. 16,17) By the way, the finite element method (FEM) is widely used to analyze SAW device characteristics directly and extract parameters necessary for behavior models. [18][19][20][21] It was believed that the FEM was not applicable to simulate practical SAW devices using three dimensional (3D) models with finite number of electrodes and aperture width because of required computation time and memory size.…”

Section: Introductionmentioning

confidence: 99%

Study of loss mechanisms in temperature compensated surface acoustic wave devices based on finite element method analysis using hierarchical cascading technique

Matsuoka

Omori

Hashimoto

2020

Jpn. J. Appl. Phys.

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This paper discusses loss mechanisms of temperature compensated surface acoustic wave (TC-SAW) devices using the SiO2 overcoated 128°YX-LiNbO3 (128-LN) substrate. Analysis is based on the finite element method (FEM) combined with the hierarchical cascading technique and the general purpose graphics processing unit. Three kinds of FEM model, i.e. 2.5D, three dimensional (3D) periodic and full 3D are analyzed without taking additional losses, i.e. material viscous loss, dielectric loss and electrode ohmic loss, and influence of scattering at structural discontinuities is evaluated solely. It is shown that although Q reduction is significant with an increase of the simulation dimension, in other words, that of the number of acoustic scattering mechanisms, estimated Q value is still considerably higher than reported values even for full 3D simulation. This result indicates that acoustic scattering at structural discontinuities is not a dominant loss mechanism in current TC-SAW devices employing the SiO2 overcoated 128-LN substrate.

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Analysis of SAW Scattering With Discontinuous Periodic Gratings Using Travelling Wave Excitation and Hierarchical Cascading Technique

Cited by 6 publications

References 18 publications

From Microwave Acoustic Filters to Millimeter-Wave Operation and New Applications

From Microwave Acoustic Filters to Millimeter-Wave Operation and New Applications

Field analyses of thickness shear bulk acoustic resonators with different electrode edge ratio using full three dimensional finite element method simulation

Study of loss mechanisms in temperature compensated surface acoustic wave devices based on finite element method analysis using hierarchical cascading technique

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