Impact of coupling between multiple SAW modes on piston mode operation of SAW resonators

Model parameter extraction of lateral propagating surface acoustic waves with coupling on SiO2/grating/LiNbO3structure

“…(3) after fitting. 31) It is seen that agreement between these two calculations is excellent. In this cases, determined parameters are: a 1 = 0.92, a 2 = 0.48, and b = 0.17.…”

“…Only one branch is excitable electrically for each SAW mode. 16) In this case, both the lower branches of the two modes are excitable.…”

“…The authors indicated that when the following condition is satisfied, PMO is possible without giving phase shifters: 16)…”

“…Recently, the authors also indicated that the coupling between two SAWs gives significant impacts on their lateral propagation, too. 16) For example, it was shown that the piston mode operation (PMO) [17][18][19][20][21][22] is possible without giving phase shifters at electrode edges (see Fig. 1) when two SAW modes are coupled.…”

“…1) when two SAW modes are coupled. 16) This paper describes how lateral propagation of Rayleigh and SH SAWs changes with θ and SiO 2 and electrode (Cu) thicknesses, h SiO2 and h Cu , respectively. The extended thin plate model 23,24) is applied for the characterization.…”