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

By Clemens C. W. Ruppel

Floor acoustic wave (SAW) units are famous for his or her versatility and potency in controlling and processing electric indications. This has led to a mess of equipment ideas for a variety of sign processing capabilities, comparable to hold up strains, filters, resonators, pulse compressors, convolvers, and plenty of extra. As observed know-how has came across its means into mass industry items corresponding to television receivers, pagers, keyless access platforms and mobile telephones, the construction quantity has risen to thousands of units produced on a daily basis. on the different finish of the size, those are really good excessive functionality sign processing observed units for satellite tv for pc communique and armed forces purposes, equivalent to radar and digital conflict. This quantity, including quantity 1, offers an outline of contemporary advances in observed expertise, structures and purposes via a few of the optimal researchers during this fascinating box.

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

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Due to the long range of electrostatic forces, the capacitance actually depends on the length and aperture of the structure, but in long transducers the value is practically proportional to the device length. Therefore it is convenient-especially in device design-to introduce normalized capacitance Cn = Cp/W, t h a t is: capacitance per period (electrode pair) and per unit length of aperture. If the aperture is expressed in micrometers, the values for LSAW-cuts in LiTaC>3 and LiNb03 substrates are about 48-64-lO" 5 p F / p m .

Note, however, that the parameter includes all acoustic energy loss mechanisms in the device and that it itself also depends on frequency. There are many contributions to the SAW attenuation, such as • the interaction with thermal phonons, inherent to crystalline material and unavoidable at finite temperatures • scattering on surface and near-surface defects • air loading (or loading by another adjacent medium) • acoustic attenuation in metal fingers • acousto-electric interactions 24 Coupling-of-Modes Analysis of SAW Devices 891 • diffraction • coupling with other, parasitic modes such as bulk waves.

Parameter extraction from simulations Although the COM model may be applied for nonhomogeneous structures, it is foremost a theory for counterpropagating waves weakly perturbed and coupled by a periodic grating. On this basis, the ideal structure for the determination of the COM parameters would appear to be an infinite periodic array of electrodes. From the point of a view of numerical simulations, such a periodic structure has one very significant additional advantage over finite structures: only one period of the array needs be modeled, leading to a drastic decrease in the required computational load.

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