Catalogo Articoli (Spogli Riviste)


Exact expression for the impedance of a rectangular strip and second-ordereffects in Bleustein-Gulyaev wave scattering
Biryukov, SV; Polevoi, VG; Weihnacht, M;
Mints Radiotech Inst, Radiophys Res Lab, Moscow 125083, Russia Mints Radiotech Inst Moscow Russia 125083 Res Lab, Moscow 125083, Russia InstGermanyState & Mat Res Dresden, Inst Solid State Res, D-01171 Dresden,Inst Solid State & Mat Res Dresden Dresden Germany D-01171 1171 Dresden, Special Sci & Prod State Enterprise ELERON, Moscow 115563, Russia Special Sci & Prod State Enterprise ELERON Moscow Russia 115563 , Russia
Titolo Testata:
fascicolo: 12, volume: 84, anno: 1998,
pagine: 6698 - 6707
Tipo documento:
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Indirizzi per estratti:
Indirizzo: Biryukov, SV Mintsussiaotech Inst, Radiophys Res Lab, 8 Marta St 10-12, Moscow 125083, R Mints Radiotech Inst 8 Marta St 10-12 Moscow Russia 125083 R
S.V. Biryukov et al., "Exact expression for the impedance of a rectangular strip and second-ordereffects in Bleustein-Gulyaev wave scattering", J APPL PHYS, 84(12), 1998, pp. 6698-6707


A novel exact expression for the impedance of a rectangular strip of arbitrary width and height, in the case of horizontally polarized waves, is derived. The impedance exactly describes the relation between the displacement and stress distributions on one side of the strip if its other sides are free from stresses. The expression found is for the main part in summed form,and it enables to calculate the impedance in a rigorous manner, including when various limiting cases of strip sizes are considered and all harmonicsof the field inside the strip are taken into account. The impedance representation obtained is applied to the problem of Bleustein-Gulyaev wave scattering on a single rectangular strip of small height. The exact asymptotic expressions for the complex amplitudes of the reflection and transmission coefficients are calculated for this problem, taking into account second-order effects with respect to a small parameter such as the ratio between the strip height and the wavelength. The bulk wave contribution to these effectsfits naturally into the method of calculation. The primary aim of this investigation is to illustrate the character and origin of the various contributions to the second-order effects. The calculated results may be useful totackle the same problem in the considerably more important and complicatedcase of Rayleigh-wave-like scattering, which so far remains to be solved in a rigorous manners. Second-order effects considerably shift the resonancefrequencies in surface acoustic wave devices and a correct model explaining this shift is necessary, particularly for experimental investigations. Itis shown that the second-order effects are not purely quadratic with respect to the small parameter considered, rather, the main contribution contains as a multiplier, the logarithm of this parameter. This contribution is related to static fields in the strip and may be calculated using a simpler expression for the strip impedance. The strip width dependence of the second-order effects is also investigated. The strongly piezoelectric crystal LiIO3 and an aluminum strip are chosen to illustrate the results. (C) 1998 American Institute of Physics. [S0021-8979(98)05624-2].

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