By Clemens C. W. Ruppel
A part of a suite of 14 reports of quite a lot of themes in acoustic wave know-how, aimed toward the clinical viewers. gains seven really good papers in all, discussing problems with observed units, from Green's services to instant observed sensor structures.
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Additional info for Advances in surface acoustic wave technology, systems and applications. Vol. 2
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. The fast Fourier transform (FFT), analysis of pulse propagation in the time domain, and time gating were applied.
7. Resonance-antiresonance pattern in the admittance of an infinitely long periodic transducer. Solid and dashed curve: real and imaginary parts, respectively. and pE _ ••33 — 4c^ L + iujCL. '7 (74) 0 — K In long structures, the latter term dominates; the resulting admittance is illustrated in Fig. 7. A strong resonance is formed at one edge of the stopband due to constructively interfering eigenmodes; the other edge of the stopband cannot be observed since the interference is destructive. Furthermore, an antiresonance is created at the frequency where the imaginary part of the admittance crosses zero.
S. is negative and it describes slowing of the wave due to the electric loading. 47 Conductive electrodes on the surface short-circuit electric 23 890 V. Plessky & J. Koskela Table 2. 5, / J / A O = 0 - 1 % substrate v0 [m/s] ST-quartz X-112°Y-LiTa03 3158 3301 (*). 43 Materials parameters for quartz and LiTa03 from Refs. 50,51. fields, decreasing the energy flow in the wave and consequently, velocity. The term is roughly proportional to the piezoelectric coupling coefficient. The second and third terms describe the linear shift due to the mechanical loading and the so-called energy storage effect, 44 ' 48 respectively.
Advances in surface acoustic wave technology, systems and applications. Vol. 2 by Clemens C. W. Ruppel