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Frequency response of a focused SAW device based on concentric wave surfaces: simulation and experiment.

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Title: Frequency response of a focused SAW device based on concentric wave surfaces: simulation and experiment.
Authors: Tsung-Tsong TW Wu, He-Tai HT Tang, Yung-Yu YC Chen
Source: Journal of Physics D: Applied Physics. Aug2005, Vol. 38 Issue 16, p2986-2994. 9p.
Abstract: Focused interdigital transducers (FIDTs) based on concentric wave surfaces can excite surface acoustic wave (SAW) with high intensity, high beamwidth compression ratio and small localized area. In this paper, we developed a model to analyse the frequency response of a SAW device with FIDTs based on concentric wave surfaces. First, we constructed a focused SAW device by adopting a pair of FIDTs shaped as the concentric wave surface. To calculate its frequency response, a simulation model was established based on the 2D SAW filter model, effective permittivity approach and perturbation theory. Further, the focused SAW devices were designed and fabricated via the microelectromechanical system process technique. A good agreement between the simulated and measured results was found. Finally, the frequency responses of focused SAW devices based on concentric wave surfaces were discussed and some attractive features were found, such as less ripples of pass-band and high stop-band rejection. In addition, in comparison with the conventional SAW devices with uniform interdigital transducers, the focused SAW devices are more sensitive to variations in the focal area, instead of the whole delayline region. Accordingly, they are suitable to be applied to detect or manipulate some localized variations, such as acousto-optic or acousto-electric effects. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Physics D: Applied Physics is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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Header DbId: egs
DbLabel: Engineering Source
An: 20127330
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  Data: Frequency response of a focused SAW device based on concentric wave surfaces: simulation and experiment.
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  Data: <searchLink fieldCode="AR" term="%22Tsung-Tsong+TW+Wu%22">Tsung-Tsong TW Wu</searchLink><br /><searchLink fieldCode="AR" term="%22He-Tai+HT+Tang%22">He-Tai HT Tang</searchLink><br /><searchLink fieldCode="AR" term="%22Yung-Yu+YC+Chen%22">Yung-Yu YC Chen</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Physics+D%3A+Applied+Physics%22">Journal of Physics D: Applied Physics</searchLink>. Aug2005, Vol. 38 Issue 16, p2986-2994. 9p.
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Focused interdigital transducers (FIDTs) based on concentric wave surfaces can excite surface acoustic wave (SAW) with high intensity, high beamwidth compression ratio and small localized area. In this paper, we developed a model to analyse the frequency response of a SAW device with FIDTs based on concentric wave surfaces. First, we constructed a focused SAW device by adopting a pair of FIDTs shaped as the concentric wave surface. To calculate its frequency response, a simulation model was established based on the 2D SAW filter model, effective permittivity approach and perturbation theory. Further, the focused SAW devices were designed and fabricated via the microelectromechanical system process technique. A good agreement between the simulated and measured results was found. Finally, the frequency responses of focused SAW devices based on concentric wave surfaces were discussed and some attractive features were found, such as less ripples of pass-band and high stop-band rejection. In addition, in comparison with the conventional SAW devices with uniform interdigital transducers, the focused SAW devices are more sensitive to variations in the focal area, instead of the whole delayline region. Accordingly, they are suitable to be applied to detect or manipulate some localized variations, such as acousto-optic or acousto-electric effects. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Physics D: Applied Physics is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1088/0022-3727/38/16/035
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            NameFull: He-Tai HT Tang
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              Text: Aug2005
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