Get Advances in Surface Acoustic Wave Technology, Systems and PDF

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 ended in a mess of equipment suggestions for quite a lot of sign processing features, corresponding to hold up strains, filters, resonators, pulse compressors, convolvers, and plenty of extra. As observed expertise has came across its approach into mass industry items comparable 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 dimensions, those are really expert excessive functionality sign processing observed units for satellite tv for pc verbal exchange and armed forces purposes, corresponding to radar and digital battle. This quantity, including quantity 1, provides an summary of modern advances in observed expertise, platforms and functions by way of the various most efficient researchers during this interesting box.

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

Example text

Since an arbitrary voltage configuration in a periodic array may be expressed through 7-harmonic voltages using Fourier-transform techniques, the harmonic admittance contains a complete description of the electric response of the structure, see the discussions in Refs. 7, 91. In particular, the zeros and poles of the harmonic admittance respectively indicate the eigenmodes of electrically open and shorted V0ea" \e-aicr y^MKY .. 1 p-

Consequently, small changes in the velocity inside the stopband result in a strong change of the localization depth, and may eventually delocalize the surface wave into a bulk wave. Therefore, the application of the standard COM model is, from the very beginning, questionable. Alternative formulations have been suggested by a few authors, 7 5 ' 3 2 ' 3 3 ' 7 6 ' 7 7 in most cases directly based on the Floquet theorem and the algebraic form of COM equations. 1. , Refs. 75,78. This approach leads to a system of equations, the solutions of which yield the dispersion relation of the eigenmodes; the modern F E M / B E M simulators are based on the same concept, with a more sophisticated selection of the degrees of freedom and rigorous numerical treatment of the mechanical boundary conditions.

3-10 - 5 Neper/wavelength), electrical measurements of test devices in the 1 GHz frequency range yield attenuation parameters that are almost 2 orders higher (about 10~ 3 Neper/wavelength). The reasons for such high attenuation are not clear for the moment. 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 .

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


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