Download e-book for iPad: Advances in Surface Acoustic Wave Technology, Systems and by Clemens C. W. Ruppel

By Clemens C. W. Ruppel

ISBN-10: 9810245386

ISBN-13: 9789810245382

ISBN-10: 9812811567

ISBN-13: 9789812811561

Floor acoustic wave (SAW) units are famous for his or her versatility and potency in controlling and processing electric signs. This has led to a mess of gadget recommendations for a variety of sign processing capabilities, corresponding to hold up traces, filters, resonators, pulse compressors, convolvers, and plenty of extra. As observed expertise has came upon its means into mass marketplace items reminiscent of television receivers, pagers, keyless access platforms and mobile telephones, the construction quantity has risen to hundreds of thousands of units produced on a daily basis. on the different finish of the dimensions, those are really good excessive functionality sign processing observed units for satellite tv for pc verbal exchange and armed forces purposes, reminiscent of radar and digital conflict. This quantity, including quantity 1, offers an summary of contemporary advances in observed know-how, structures and purposes by way of many of the superior researchers during this fascinating box.

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Additional resources for Advances in Surface Acoustic Wave Technology, Systems and Applications Volume 2

Sample text

Many authors successfully use equivalent circuit models, 1 where SAW propagation is modeled as EM signal propagation in a transmission line, the free surface and metallized area being described by different impedances of the transmission line. The signal generation due to an applied voltage, the current generation in the load as well as losses and energy storage effects are included. 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.

Besides the other mentioned mechanisms, also waveguide losses are expected to contribute: although the attenuation is minimized for X-propagation, the losses increase radically for propagation directions offset from the crystal X-axis. 3. Reflectivity The magnitude of the normalized reflectivity, KP, is equal to the absolute value of the reflection coefficient per period, and it determines the relative width of the stopband, A / / / O = | K P | / 7 T . g. for thick aluminium electrodes on 128°YX-cut LiNb03.

Although the approximate 6 closed-form dispersion relation (102) is convenient and illustrative, it results in slightly incorrect asymptotic behaviour far from the stopband, see Fig. 9. This discrepancy is due to treating the unperturbed wave as a surface-skimming bulk wave (SSBW). This approximation is good only if the uniform load, described by parameter n, is small. At and near the stopband the localization depth is determined by the Bragg reflections, but for large detunings even a small uniform load is important and the wave behaves more like a Love wave, weakly localized near the surface, rather than like a SSBW.

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Advances in Surface Acoustic Wave Technology, Systems and Applications Volume 2 by Clemens C. W. Ruppel


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