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Songbin Gong - One of the best experts on this subject based on the ideXlab platform.

  • low loss 5 ghz first order Antisymmetric Mode acoustic delay lines in thin film lithium niobate
    IEEE Transactions on Microwave Theory and Techniques, 2021
    Co-Authors: Yansong Yang, Steffen Link, Songbin Gong
    Abstract:

    In this work, we present the low-loss acoustic delay lines (ADLs) at 5 GHz, using the first-order Antisymmetric (A1) Mode in 128° Y-cut lithium niobate thin films. The ADLs use a single-phase unidirectional transducer (SPUDT) design with a feature size of quarter acoustic wavelength. The design space is analytically explored and experimentally validated. The fabricated miniature A1 ADLs with a feature size of $0.45~\mu \text{m}$ show a high operating frequency at 5.4 GHz, a minimum insertion loss (IL) of 3 dB, a fractional bandwidth (FBW) of 1.6%, and a small footprint of 0.0074 mm2. The low IL and high operating frequency have significantly surpassed the state-of-the-art performance of ADLs. The propagation characteristics of A1 acoustic waves have also been extracted. The demonstrated designs can lead to low-loss and high-frequency transversal filters for future 5G applications in the sub-6-GHz bands.

  • high q Antisymmetric Mode lithium niobate mems resonators with spurious mitigation
    IEEE\ ASME Journal of Microelectromechanical Systems, 2020
    Co-Authors: Yansong Yang, Songbin Gong
    Abstract:

    This paper reports on the demonstrations of first-order Antisymmetric Lamb wave (A1) Mode resonator as a new platform for front-end filtering of the fifth-generation (5G) wireless communication. The sub-6 GHz resonance in this work is achieved by employing the A1 Mode in the micromachined Y-cut Lithium Niobate (LiNbO3) thin films. The spurious Modes mitigation is achieved by optimizing the distribution of the electric field. The demonstrated figure-of-merit ( $\text {FoM}=Q\cdot k_{t}^{2}$ ) of 435 marks the first time that a new resonator technology with the FoMs exceeds those of surface acoustic wave (SAW) resonators and thin-film bulk acoustic resonators (FBARs) in the sub-6 GHz (1–6 GHz) frequency range. [2019-0241]

  • 5 ghz Antisymmetric Mode acoustic delay lines in lithium niobate thin film
    IEEE Transactions on Microwave Theory and Techniques, 2020
    Co-Authors: Ruochen Lu, Yansong Yang, Minghuang Li, Michael S Breen, Songbin Gong
    Abstract:

    We present the first group of acoustic delay lines (ADLs) at 5 GHz using the first-order Antisymmetric (A1) Mode in Z-cut lithium niobate thin films. The demonstrated ADLs significantly surpass the operation frequencies of the prior art with similar feature sizes because of their simultaneously fast phase velocity, large coupling coefficient, and low loss. In this article, the propagation characteristics of the A1 Mode in lithium niobate are analytically Modeled and validated with finite element analysis. The design space of A1 ADLs is then investigated, including both the fundamental design parameters and those introduced from the practical implementation. The implemented ADLs at 5 GHz show a minimum insertion loss of 7.9 dB, an average insertion loss (IL) of 9.1 dB, and a fractional bandwidth around 4%, with group delays ranging between 15 and 109 ns and the center frequencies between 4.5 and 5.25 GHz. The propagation characteristics of A1 Mode acoustic waves have also been extracted for the first time. The A1 ADL platform can potentially enable wideband high-frequency passive signal processing functions for future 5G applications in the sub-6-GHz spectrum bands.

  • 5 ghz acoustic delay lines using Antisymmetric Mode in lithium niobate thin film
    Internaltional Ultrasonics Symposium, 2019
    Co-Authors: Yansong Yang, Michael Breen, Songbin Gong
    Abstract:

    This paper demonstrates the first group of acoustic delay lines (ADLs) at 5 GHz, using the first-order Antisymmetric (A1) Mode in Z-cut lithium niobate thin films. Thanks to the fast phase velocity, large coupling coefficient, and low-loss of A1 waves, the implemented ADLs significantly surpass the operation frequency of precious works with similar feature sizes. The impact of the key design parameters on the device performance is first discussed. The implemented ADLs at 5 GHz show a minimum insertion loss of 7.9 dB, and delays ranging between 15 ns and 109 ns over a fractional bandwidth around 4%. The propagation characteristics of A1 Mode acoustic waves have also been extracted for the first time. The A1 ADLs can potentially enable wideband high-frequency passive signal processing functions for future 5G applications in the sub-6 GHz spectrum bands.

  • 5 ghz Antisymmetric Mode acoustic delay lines in lithium niobate thin film
    arXiv: Signal Processing, 2019
    Co-Authors: Yansong Yang, Michael Breen, Songbin Gong
    Abstract:

    We present the first group of acoustic delay lines (ADLs) at 5 GHz, using the first-order Antisymmetric (A1) Mode in Z-cut lithium niobate thin films. The demonstrated ADLs significantly surpass the operation frequency of the previous works with similar feature sizes, because of its simultaneously fast phase velocity, large coupling coefficient, and low-loss. In this work, the propagation characteristics of the A1 Mode in lithium niobate is analytically Modeled and validated with finite element analysis. The design space of A1 ADLs is then investigated, including both the fundamental design parameters and those introduced from the practical implementation. The implemented ADLs at 5 GHz show a minimum insertion loss of 7.94 dB, an average IL of 9.1 dB, and a fractional bandwidth around 4%, with delays ranging between 15 ns to 109 ns and the center frequencies between 4.5 GHz and 5.25 GHz. The propagation characteristics of A1 Mode acoustic waves have also been extracted for the first time. The A1 ADL platform can potentially enable wide-band high-frequency passive signal processing functions for future 5G applications in the sub-6 GHz spectrum bands.

Yansong Yang - One of the best experts on this subject based on the ideXlab platform.

  • low loss 5 ghz first order Antisymmetric Mode acoustic delay lines in thin film lithium niobate
    IEEE Transactions on Microwave Theory and Techniques, 2021
    Co-Authors: Yansong Yang, Steffen Link, Songbin Gong
    Abstract:

    In this work, we present the low-loss acoustic delay lines (ADLs) at 5 GHz, using the first-order Antisymmetric (A1) Mode in 128° Y-cut lithium niobate thin films. The ADLs use a single-phase unidirectional transducer (SPUDT) design with a feature size of quarter acoustic wavelength. The design space is analytically explored and experimentally validated. The fabricated miniature A1 ADLs with a feature size of $0.45~\mu \text{m}$ show a high operating frequency at 5.4 GHz, a minimum insertion loss (IL) of 3 dB, a fractional bandwidth (FBW) of 1.6%, and a small footprint of 0.0074 mm2. The low IL and high operating frequency have significantly surpassed the state-of-the-art performance of ADLs. The propagation characteristics of A1 acoustic waves have also been extracted. The demonstrated designs can lead to low-loss and high-frequency transversal filters for future 5G applications in the sub-6-GHz bands.

  • high q Antisymmetric Mode lithium niobate mems resonators with spurious mitigation
    IEEE\ ASME Journal of Microelectromechanical Systems, 2020
    Co-Authors: Yansong Yang, Songbin Gong
    Abstract:

    This paper reports on the demonstrations of first-order Antisymmetric Lamb wave (A1) Mode resonator as a new platform for front-end filtering of the fifth-generation (5G) wireless communication. The sub-6 GHz resonance in this work is achieved by employing the A1 Mode in the micromachined Y-cut Lithium Niobate (LiNbO3) thin films. The spurious Modes mitigation is achieved by optimizing the distribution of the electric field. The demonstrated figure-of-merit ( $\text {FoM}=Q\cdot k_{t}^{2}$ ) of 435 marks the first time that a new resonator technology with the FoMs exceeds those of surface acoustic wave (SAW) resonators and thin-film bulk acoustic resonators (FBARs) in the sub-6 GHz (1–6 GHz) frequency range. [2019-0241]

  • 5 ghz Antisymmetric Mode acoustic delay lines in lithium niobate thin film
    IEEE Transactions on Microwave Theory and Techniques, 2020
    Co-Authors: Ruochen Lu, Yansong Yang, Minghuang Li, Michael S Breen, Songbin Gong
    Abstract:

    We present the first group of acoustic delay lines (ADLs) at 5 GHz using the first-order Antisymmetric (A1) Mode in Z-cut lithium niobate thin films. The demonstrated ADLs significantly surpass the operation frequencies of the prior art with similar feature sizes because of their simultaneously fast phase velocity, large coupling coefficient, and low loss. In this article, the propagation characteristics of the A1 Mode in lithium niobate are analytically Modeled and validated with finite element analysis. The design space of A1 ADLs is then investigated, including both the fundamental design parameters and those introduced from the practical implementation. The implemented ADLs at 5 GHz show a minimum insertion loss of 7.9 dB, an average insertion loss (IL) of 9.1 dB, and a fractional bandwidth around 4%, with group delays ranging between 15 and 109 ns and the center frequencies between 4.5 and 5.25 GHz. The propagation characteristics of A1 Mode acoustic waves have also been extracted for the first time. The A1 ADL platform can potentially enable wideband high-frequency passive signal processing functions for future 5G applications in the sub-6-GHz spectrum bands.

  • 5 ghz acoustic delay lines using Antisymmetric Mode in lithium niobate thin film
    Internaltional Ultrasonics Symposium, 2019
    Co-Authors: Yansong Yang, Michael Breen, Songbin Gong
    Abstract:

    This paper demonstrates the first group of acoustic delay lines (ADLs) at 5 GHz, using the first-order Antisymmetric (A1) Mode in Z-cut lithium niobate thin films. Thanks to the fast phase velocity, large coupling coefficient, and low-loss of A1 waves, the implemented ADLs significantly surpass the operation frequency of precious works with similar feature sizes. The impact of the key design parameters on the device performance is first discussed. The implemented ADLs at 5 GHz show a minimum insertion loss of 7.9 dB, and delays ranging between 15 ns and 109 ns over a fractional bandwidth around 4%. The propagation characteristics of A1 Mode acoustic waves have also been extracted for the first time. The A1 ADLs can potentially enable wideband high-frequency passive signal processing functions for future 5G applications in the sub-6 GHz spectrum bands.

  • 5 ghz Antisymmetric Mode acoustic delay lines in lithium niobate thin film
    arXiv: Signal Processing, 2019
    Co-Authors: Yansong Yang, Michael Breen, Songbin Gong
    Abstract:

    We present the first group of acoustic delay lines (ADLs) at 5 GHz, using the first-order Antisymmetric (A1) Mode in Z-cut lithium niobate thin films. The demonstrated ADLs significantly surpass the operation frequency of the previous works with similar feature sizes, because of its simultaneously fast phase velocity, large coupling coefficient, and low-loss. In this work, the propagation characteristics of the A1 Mode in lithium niobate is analytically Modeled and validated with finite element analysis. The design space of A1 ADLs is then investigated, including both the fundamental design parameters and those introduced from the practical implementation. The implemented ADLs at 5 GHz show a minimum insertion loss of 7.94 dB, an average IL of 9.1 dB, and a fractional bandwidth around 4%, with delays ranging between 15 ns to 109 ns and the center frequencies between 4.5 GHz and 5.25 GHz. The propagation characteristics of A1 Mode acoustic waves have also been extracted for the first time. The A1 ADL platform can potentially enable wide-band high-frequency passive signal processing functions for future 5G applications in the sub-6 GHz spectrum bands.

Ruochen Lu - One of the best experts on this subject based on the ideXlab platform.

  • 5 ghz Antisymmetric Mode acoustic delay lines in lithium niobate thin film
    IEEE Transactions on Microwave Theory and Techniques, 2020
    Co-Authors: Ruochen Lu, Yansong Yang, Minghuang Li, Michael S Breen, Songbin Gong
    Abstract:

    We present the first group of acoustic delay lines (ADLs) at 5 GHz using the first-order Antisymmetric (A1) Mode in Z-cut lithium niobate thin films. The demonstrated ADLs significantly surpass the operation frequencies of the prior art with similar feature sizes because of their simultaneously fast phase velocity, large coupling coefficient, and low loss. In this article, the propagation characteristics of the A1 Mode in lithium niobate are analytically Modeled and validated with finite element analysis. The design space of A1 ADLs is then investigated, including both the fundamental design parameters and those introduced from the practical implementation. The implemented ADLs at 5 GHz show a minimum insertion loss of 7.9 dB, an average insertion loss (IL) of 9.1 dB, and a fractional bandwidth around 4%, with group delays ranging between 15 and 109 ns and the center frequencies between 4.5 and 5.25 GHz. The propagation characteristics of A1 Mode acoustic waves have also been extracted for the first time. The A1 ADL platform can potentially enable wideband high-frequency passive signal processing functions for future 5G applications in the sub-6-GHz spectrum bands.

Sebastien Deck - One of the best experts on this subject based on the ideXlab platform.

  • Large scale dynamics of a high Reynolds number axisymmetric separating/reattaching flow
    Physics of Fluids, 2019
    Co-Authors: R. Pain, Pierreelie Weiss, Sebastien Deck, Jean-christophe Robinet
    Abstract:

    A numerical study is conducted to unveil the large scale dynamics of a high Reynolds number axisymmetric separating/reattaching flow at M∞ = 0.7. The numerical simulation allows us to acquire a high rate sampled unsteady volumetric dataset. This huge amount of spatial and temporal information is exploited in the Fourier space to visualize for the first time in physical space and at such a high Reynolds number (Re_D = 1.2 × 106) the statistical signature of the helical structure related to the Antisymmetric Mode (m = 1) at St_D = 0.18. The main hydrodynamic mechanisms are identified through the spatial distribution of the most energetic frequencies, i.e., St_D = 0.18 and St_D ≥ 3.0 corresponding to the vortex-shedding and Kelvin-Helmholtz instability phenomena, respectively. In particular, the dynamics related to the dimensionless shedding frequency is shown to become dominant for 0.35 ≤ x/D ≤ 0.75 in the whole radial direction as it passes through the shear layer. The spatial distribution of the coherence function for the most significant Modes as well as a three-dimensional Fourier decomposition suggests the global features of the flow mechanisms. More specifically, the novelty of this study lies in the evidence of the flow dynamics through the use of cross-correlation maps plotted with a frequency selection guided by the characteristic Strouhal number formerly identified in a local manner in the flow field or at the wall. Moreover and for the first time, the understanding of the scales at stake is supported both by a Fourier analysis and a dynamic Mode decomposition in the complete three-dimensional space surrounding the afterbody zone.

  • control of the Antisymmetric Mode m 1 for high reynolds axisymmetric turbulent separating reattaching flows
    Physics of Fluids, 2011
    Co-Authors: Pierreelie Weiss, Sebastien Deck
    Abstract:

    The separated flow over a three-dimensional axisymmetric step controlled by means of continuous jets is investigated numerically at a high subsonic regime using Zonal Detached Eddy Simulation (ZDES). The main objective is here to analyze the influence of two controlled devices acting in different regions of the separated flow, i.e., in the shear layer or in the recirculation area. Contrary to most flow control strategies that aim at reducing the drag, the final purpose of this study consists in controlling the Antisymmetric azimuthal Mode (m=1) responsible for side loads occurring on a massively separated afterbody. Thus, the design of controlled cases has been motivated both by a literature review which is detailed but especially by the previous identification of a potential area of receptiveness linked to an absolutely unstable area. The related achievement expected lies in increasing the three-dimensionality of the flow but decreasing its large scale coherence. For both controlled configurations, insta...

Michael Breen - One of the best experts on this subject based on the ideXlab platform.

  • 5 ghz acoustic delay lines using Antisymmetric Mode in lithium niobate thin film
    Internaltional Ultrasonics Symposium, 2019
    Co-Authors: Yansong Yang, Michael Breen, Songbin Gong
    Abstract:

    This paper demonstrates the first group of acoustic delay lines (ADLs) at 5 GHz, using the first-order Antisymmetric (A1) Mode in Z-cut lithium niobate thin films. Thanks to the fast phase velocity, large coupling coefficient, and low-loss of A1 waves, the implemented ADLs significantly surpass the operation frequency of precious works with similar feature sizes. The impact of the key design parameters on the device performance is first discussed. The implemented ADLs at 5 GHz show a minimum insertion loss of 7.9 dB, and delays ranging between 15 ns and 109 ns over a fractional bandwidth around 4%. The propagation characteristics of A1 Mode acoustic waves have also been extracted for the first time. The A1 ADLs can potentially enable wideband high-frequency passive signal processing functions for future 5G applications in the sub-6 GHz spectrum bands.

  • 5 ghz Antisymmetric Mode acoustic delay lines in lithium niobate thin film
    arXiv: Signal Processing, 2019
    Co-Authors: Yansong Yang, Michael Breen, Songbin Gong
    Abstract:

    We present the first group of acoustic delay lines (ADLs) at 5 GHz, using the first-order Antisymmetric (A1) Mode in Z-cut lithium niobate thin films. The demonstrated ADLs significantly surpass the operation frequency of the previous works with similar feature sizes, because of its simultaneously fast phase velocity, large coupling coefficient, and low-loss. In this work, the propagation characteristics of the A1 Mode in lithium niobate is analytically Modeled and validated with finite element analysis. The design space of A1 ADLs is then investigated, including both the fundamental design parameters and those introduced from the practical implementation. The implemented ADLs at 5 GHz show a minimum insertion loss of 7.94 dB, an average IL of 9.1 dB, and a fractional bandwidth around 4%, with delays ranging between 15 ns to 109 ns and the center frequencies between 4.5 GHz and 5.25 GHz. The propagation characteristics of A1 Mode acoustic waves have also been extracted for the first time. The A1 ADL platform can potentially enable wide-band high-frequency passive signal processing functions for future 5G applications in the sub-6 GHz spectrum bands.