Spurious free TC-SAW duplexer using the SiO2/LiNbO3 structure

In this study, modeling and suppression method of the spurious response that are indispensable for the design of Temperature Compensated Surface Acoustic Wave filter (TC-SAW) of SiO2/LiNbO3 structure are introduced. First, we propose an extended COM model that considers multiple mode mutual coupling. This multi-mode COM model can predict the interaction between Rayleigh and SH modes in the TC-SAW structure. It was then applied to the analysis of a dual-mode SAW filter (DMS), and this method was very effective in improving the prediction accuracy of the spurious response. Next, the modeling method of the transverse mode in TC-SAW and suppression method are introduced. We have developed the spurious free LTE Band 8 TC-SAW Duplexer that is mass-produced and commercialized.