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 ended in a large number of gadget ideas for quite a lot of sign processing capabilities, reminiscent of hold up traces, filters, resonators, pulse compressors, convolvers, and plenty of extra. As observed know-how has discovered its manner into mass industry items reminiscent of television receivers, pagers, keyless access structures 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 size, those are really good excessive functionality sign processing observed units for satellite tv for pc verbal exchange and army purposes, reminiscent of radar and digital struggle. This quantity, including quantity 1, offers an summary of modern advances in observed know-how, structures and purposes by means of many of the most efficient researchers during this intriguing box.
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Extra resources for Advances in Surface Acoustic Wave Technology, Systems and Applications Volume 2
If the frequency range of interest is rather large, the wavelength A and thus, the relative dimensions of the structure do not remain the same. e frequency-dependent changes in the wave velocity and other COM parameters. In principle, all COM parameters may have a smooth dependence on frequency. However, the most visible effects result from velocity dispersion. Typically, the velocity decreases with an increase in the relative electrode thickness h/X. For low frequencies the relative thickness is smaller than the value in the stopband, H/XQ.
Between the terminals and the reflector the waves are assumed to propagate with some reference wavenumber, say fco = u/v. Since the reflected waves travel the distance between the terminal and the reflection center twice, the reflection coefficients P n and P22 may be expressed as p _ re—iko2(xr—xo+Ao/2) PP 2 2 =re -ifco2(x 0 +A 0 /2-a :r )_ 22 On the other hand, from COM we obtain P n « i/c* and P22 « inp. comparison shows that 0 r = 2k0 (xT - xo) + nir, such that f P n = ±i|/«P|e-i2fc»(^o), \ P22 = ±iK|e+ i 2 f c °^°>.
If the COM theory is accurate enough, the velocity, coupling coefficient, and transduction coefficient may be easily extracted from the rigorously computed capacitance and the edges of the stopbands for shorted and open gratings. 2 5 Careful analysis 94 of the COM equations shows that in a symmetric structure the stopbands for open and shorted gratings feature one coinciding edge, whereas in a unidirectional structure the stopband edges are separated from each other, see Fig. 13. Let / s c ± denote the edges of the stopband for shorted grating.