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It is well known that the propagation loss in leaky wave cuts on LiTaO3 and LiNbO3 depends on the geometry of Al electrodes. According to K. Hashimoto et al. [1997] the widely used cut of 36deg-LiTaO3 optimal for zero thickness of metal fingers was replaced by 42degLiTaO3 for Al electrodes with h/lambda=8% . Here we demonstrate theoretically that by introducing thin film (hdiel/lambda = 1%to 3%) sub-layer...
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