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

By Clemens C. W. Ruppel

A part of a set of 14 studies of a variety of themes in acoustic wave know-how, geared toward the clinical viewers. gains seven really good papers in all, discussing problems with observed units, from Green's capabilities to instant observed sensor platforms.

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

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Let us search for a solution of the form u(x, z) = u+e-^x+K+z + u_e-i^-^x+K-z. (93) Here, u+ and u_ represent the amplitudes of the incident and reflected wave respectively, and f3 = Q/2 + q is the wavenumber of the incident wave. The case when the reflected wave is transformed into a bulk wave scattered in the opposite direction is automatically included. The factor K± denotes the localization constant K± = ^ ( Q / 2 ± g ) 2 - A | , (94) where kB = UJ/VB and vB denotes the bulk-wave velocity. o(f-*)-2£of)«- = 2^fM+, 34 (96) Coupling-of-Modes Analysis of SAW Devices 901 are found.

5. Immediately above the resonance the susceptance (imaginary part) is negative, but it then increases and crosses the zero at the antiresonance frequency. As the frequency approaches the bulk-wave threshold, a pronounced attenuation appears due to the scattering of the LSAW into BAWs, and the conductance (real part) increases because of synchronous BAW excitation. Extraction of the COM parameters from the admittance may be done in several ways, but basically the edges of the stopband yield the velocity and the reflectivity.

For LSAWs on LiTaOs substrate the typical increase in attenuation is about 1 order of magnitude. If the aperture of an electrode structure is narrow, the transducer behaves as a waveguide. As far as equivalent counter-propagating modes are considered, there are no difficulties for the COM theory. However, changes in the phase velocity of the waves inside and near the stopband can result in curious behavior of the guided modes: in some cases the waveguiding effect can disappear at the upper edge of the stopband.

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