Dyadic Green's functions for SAW and leaky wave devices

The effective permittivity is widely used to compute the Green's function for SAW and leaky wave devices. In general, the effect of mass loading due to surface electrodes is ignored, and a single Green's function is obtained. In this paper, we examine a method, based on previous work by Adler and Peach, in which additional Green's function components describe the effects of T13, T23 and T33 stresses and the electrical displacement D on each of the u1, u2, u3 displacements and on the electrical potential φ. The sixteen-element Green's functions for representative SAW (ST-X quartz) and leaky wave (64° lithium niobate) substrates are presented.