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This paper describes the novel Rayleigh-mode spurious suppression technique for SAW duplexers with wide duplex gap on a SiO2/Al/LiNbO3 structure. We have cleared the optimum shape of SiO2 with taking account of the difference of the electrode thickness. The shape of SiO2 which can suppress the spurious depended on the thickness of Al electrode. By controlling the shape of SiO2, the Rayleigh-mode spurious...
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