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

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 mess of equipment ideas for a variety of sign processing capabilities, comparable to hold up traces, filters, resonators, pulse compressors, convolvers, and lots of extra. As observed know-how has came across its means into mass industry items reminiscent of television receivers, pagers, keyless access platforms and mobile telephones, the creation quantity has risen to hundreds of 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, equivalent to radar and digital conflict. This quantity, including quantity 1, provides an summary of modern advances in observed know-how, platforms and functions by means of a few of the greatest researchers during this intriguing box.

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

Sample text

They also depend on the frequency and temperature. In the equations (44), most COM parameters have the dimensions of densities. For example, the reflectivity K may be interpreted as reflectivity per unit length. This is not very practical. , An = 2p for a single-electrode IDT). These ideally remain scale-invariant constants. In practice, the parameters deviate because of waveguiding, parasitics, 22 Coupling-of-Modes Analysis of SAW Devices 889 Table 1. COM parameters normalized to the aperture W and the wavelength at the center frenuencv An.

In principle, they are very accurate although slow.

Plessky & J. Koskela An example of the results obtained with the fitting technique are shown in Fig. 11. 1 were included in the model 6 8 to improve the agreement on the dispersion characteristics, BAW radiation, and the level of the stopband conductance. 4 m/s, K P = - 1 9 . 6 % , a n = 8 9 - l ( T 5 Q " 1 / 2 , a n d Cn=76-10~5 pF//tm/period were found for the COM parameters of the test structure in this case. 2. 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.

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