By Clemens C. W. Ruppel
Floor acoustic wave (SAW) units are well-known for his or her versatility and potency in controlling and processing electric indications. This has led to a large number of gadget thoughts for quite a lot of sign processing features, equivalent to hold up traces, filters, resonators, pulse compressors, convolvers, and lots of extra. As observed expertise has came across its manner into mass industry items akin to television receivers, pagers, keyless access structures and mobile telephones, the construction quantity has risen to thousands of units produced each day. on the different finish of the size, those are really good excessive functionality sign processing observed units for satellite tv for pc conversation and armed forces purposes, resembling radar and digital conflict. This quantity, including quantity 1, offers an outline of modern advances in observed expertise, structures and purposes through the various leading researchers during this interesting box.
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Extra resources for Advances in Surface Acoustic Wave Technology, Systems and Applications Volume 2
Connection of mismatched transmission lines accounts for multiple reflections. Equivalent circuit models are a bit archaic but they have the strong advantage that they can be easily implemented in circuit simulation tools. 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.
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.
V7WX UWoeTd ••I M V///X . V+2 V77YJ substrate -*x Fig. 5. (a) Shorted-circuited and (b) open-circuited grating. counterpropagating modes in a short-circuited (sc) transducer or grating, see Fig. 5. 3, the solution is of the form in Eq. (34) and satisfies the dispersion relation in Eq. (33): 2 &(/) = v^-l«l - The frequency region with the pronounced attenuation, 8 < \K\, is denoted as the stopband. Neglecting the attenuation parameter 7, the lower and upper edges of the stopband are found as the zeroes of Eq.
Advances in Surface Acoustic Wave Technology, Systems and Applications Volume 2 by Clemens C. W. Ruppel