A quasi-field equivalent circuit of an interdigital transducer of surface acoustic waves

SAW radio-frequency identification tag for the 6-GHz band

“…In the calculations, the moduli of elasticity and density of both isotropic aluminum [12] and thin film aluminum [11] were used.…”

“…These parameters differ from the corresponding values for the isotropic aluminum. In particular, its density is lower by 4% (≈2600 kg/m 3 [11]) as compared to the density of bulk aluminum (2700 kg/m 3 [12]), whereas shear modulus C 44 is lower by an order of magnitude. These differences result in changes of the reflection and transmission coefficients which, in turn, leads to a decrease in the amplitudes of the reflected signals.…”

“…The high precision has been obtained through the use of the FEM/BEM [6][7][8][9][10]. For the calculation to be exact, it is also necessary to take into account the difference between the elastic properties of the alumi num thin films and bulk material [11].…”