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

By Clemens C. W. Ruppel

ISBN-10: 9810245386

ISBN-13: 9789810245382

A part of a suite of 14 studies of quite a lot of subject matters in acoustic wave know-how, aimed toward the clinical viewers. beneficial properties seven really expert papers in all, discussing problems with observed units, from Green's capabilities to instant observed sensor platforms.

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

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5. Capacitance parameter The normalized capacitance parameter, Cp, measures the electrostatic storage of energy in the structure per unit period. Due to the long range of electrostatic forces, the capacitance actually depends on the length and aperture of the structure, but in long transducers the value is practically proportional to the device length. Therefore it is convenient-especially in device design-to introduce normalized capacitance Cn = Cp/W, t h a t is: capacitance per period (electrode pair) and per unit length of aperture.

In all these models the propagation, interaction and coupling parameters are introduced phenomenologically, the COM model being the most consistent in this aspect. The problem of accurate determination of parameters is practically the same for all models. The parameters depend on the geometry and the physical properties of the electrode structure and substrate. Whatever model is used, technological variations result in inaccurate determination of the parameters and in finite precision of the design.

11. The response is very clean and displays a few features directly related to the values of COM parameters. 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.

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Advances in surface acoustic wave technology, systems and applications. Vol. 2 by Clemens C. W. Ruppel

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