By Clemens C. W. Ruppel
A part of a suite of 14 reports of quite a lot of issues in acoustic wave expertise, aimed toward the medical viewers. gains seven really expert papers in all, discussing problems with observed units, from Green's capabilities to instant observed sensor structures.
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Note that the velocity shifts are reflected in the eigenmode dispersion equation (33), which assumes the form 2 w «W(foK) - - 90 <> At frequencies above the stopband, incident leaky surface-acoustic waves and surface transverse waves are strongly scattered into bulk-acoustic waves, 3 2 , 6 7 resulting in pronounced attenuation of the surface wave. 2, but the increase in the attenuation may be roughly included into the COM model by adding an appropriate term to the attenuation parameter. 3 5 Furthermore, at frequencies close to and above the frequency / B = v&/2p, synchronous generation of bulk waves occurs in the transducer.
If the COM theory is accurate enough, the velocity, coupling coefficient, and transduction coefficient may be easily extracted from the rigorously computed capacitance and the edges of the stopbands for shorted and open gratings. 2 5 Careful analysis 94 of the COM equations shows that in a symmetric structure the stopbands for open and shorted gratings feature one coinciding edge, whereas in a unidirectional structure the stopband edges are separated from each other, see Fig. 13. Let / s c ± denote the edges of the stopband for shorted grating.
A further difficulty is t h a t certain COM parameters tend to result in similar effects. In particular, resistivity also decreases the quality factor. In general, the determination of the COM parameters for LSAW devices usually requires a trade-off between various characteristics of the admittance curve. 41 908 V. Plessky & J. Koskela An example of the results obtained with the fitting technique are shown in Fig. 11. 1 were included in the model 6 8 to improve the agreement on the dispersion characteristics, BAW radiation, and the level of the stopband conductance.