This paper presents a new and simplified equivalent circuit model for an IDT. The model developed here provides more accuracy than the well-known crossed field Smith-model, since it contains the energy storage effect in addition to usual secondary effects. By applying the image parameter theory to the new model, the admittance matrix Y
ij of the equivalent three-port model for an N-pair IDT has been derived in concise closed form. As an application, the relations of the radiation conductances to metallization ratios for an IDT are investigated.
This paper presents the new fundamental equations of electro-acoustic conversion for N-pair of IDT by using force factors. From these equations, the simplified three-port equivalent circuits have been derived. As an application, in the case that one of two acoustic ports is connected with the characteristic impedance, the two-port equivalent circuits for an IDT have also been derived in much simpler forms.
This paper presents one method of theoretical analysis of the reflection characteristics of a metal strip array (a reflector for a SAW resonator). In the analysis, the equivalent circuit model including energy storage effects and propagation losses is used. By application of the image parameter theory, the expressions for the reflection characteristics are derived in closed and simple forms. As examples of numerical calculations, the reflection characteristics for the array in the second harmonic range are investigated.
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