Advances in surface acoustic wave technology, systems and by Clemens C. W. Ruppel

By Clemens C. W. Ruppel

A part of a suite of 14 studies of quite a lot of issues in acoustic wave know-how, aimed toward the medical viewers. positive factors seven really good papers in all, discussing problems with observed units, from Green's features to instant observed sensor structures.

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Extra info for Advances in surface acoustic wave technology, systems and applications. Vol. 2

Example text

As discussed above, A B marks the threshold frequency for STW scattering into bulk waves. The parameter v2 *v = - \ (111) describes the position of the center of the stopband at the limit of vanishing interaction between the counterpropagating waves, e -> 0. The interaction consists of the coupling between surface waves, described through the parameter « =±H^±Me«-, (112) and the influence of the bulk wave, present through t h e parameter and the function v(A). The remaining parameter r\B = 77 + \e\ / 2 describes the effect of the boundary condition on the SSBW propagation.

77). 4. Transduction coefficient The normalized transduction coefficient, ap, measures the excitation of waves due to piezoelectric coupling in a unit cell of length Ao, which in the simplest case is formed by a pair of electrodes. It has the dimension of f 2 - 1 / 2 . For a very short transducer consisting only of one period, from Eq. (66) 13 +ia*, P 2 3 « -iap. (79) Thus, the absolute value \ap\ is equal to the magnitude of waves generated by the period under a drive voltage of unity, while the phase of the coefficient defines the location of the transduction center, see below.

8. Reflections and wave excitation in a unit period, interpreted as wave propagation through the centers of reflectivity and transduction. the terminals. Then, 6e = k0 (xe - x0) + nw, such that P13 \ p23 = =±i\ap\e-iko(x'-^°) ^i\ap\e+iko<-x°-^°\ (84) (85) If the transduction and reflection centers coincide, the period is physically symmetric, and any phase differences occurring between the terminals are entirely due to the terminal positions. The period is then called bidirectional. In the expression for admittance, Eq.

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