Advances in surface acoustic wave technology, systems and by Clemens C. W. Ruppel

Advances in surface acoustic wave technology, systems and by Clemens C. W. Ruppel

By Clemens C. W. Ruppel

A part of a suite of 14 stories of a variety of subject matters in acoustic wave expertise, geared toward the medical viewers. positive factors seven really good papers in all, discussing problems with observed units, from Green's features to instant observed sensor structures.

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Extra resources for Advances in surface acoustic wave technology, systems and applications. Vol. 2

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1 . g. the shape of 39 906 V. Plessky & J, Koskela Fig. 10. Test structure for COM parameter extraction. the fingers) are not known. The problem of exact measurement of SAW parameters in periodic electrode structures is not new - it has existed as long as SAW devices have been designed. The pioneering work was done by C. S. Hartmann 8 4 who proposed a multi-transducer test structure and original methods to determine SAW propagation parameters from the electrical measurements of scattering parameters.

37 904 V. Plessky & J. Koskela The physical interpretation of the parameters is very illustrative from the point of understanding the dispersion characteristics. As discussed above, A B marks the threshold frequency for STW scattering into bulk waves. The parameter v2 *v = - \ (111) describes the position of the center of the stopband at the limit of vanishing interaction between the counterpropagating waves, e -> 0. The interaction consists of the coupling between surface waves, described through the parameter « =±H^±Me«-, (112) and the influence of the bulk wave, present through t h e parameter and the function v(A).

In some cases, such as in 45°XZ-cut lithium tetraborate, 5 2 the first term is positive while the second term in negative, resulting first in an increase and then in a decrease in the velocity with growing metal thickness. 2. 6859 dB). 6859 • 7 P / [dB/fjs], (76) where 7 P is attenuation in Neper/wavelength, v is the velocity in m / s and / is frequency in MHz. Note, however, that the parameter includes all acoustic energy loss mechanisms in the device and that it itself also depends on frequency.

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