Abstract
To obtain a bonded structure with low attenuation for leaky surface acoustic waves (LSAWs), the propagation and resonance properties of LSAWs on a similar-material thin plate bonded to a LiTaO3 (LT) or LiNbO3 (LN) support substrate were theoretically analyzed. It was found that zero attenuation can be simultaneously obtained for free and metallized surfaces by utilizing the similar-material bonded structure but not when using a single structure. For a 10°YX-LN/66°YX-LN structure, the antiresonance Qa and the admittance ratio of the bonded structure were 1570 and 99 dB, respectively, even taking into consideration a mechanical loss of 1/Qm = 10−3, and were higher than those of a single LN structure. For a YX-LT/36°YX-LT structure, we observed the same or less attenuation and an approximately 1.3 times higher coupling factor than those for a single 36°YX-LT structure. The LT similar-material bonded structure had slightly superior resonance properties to the single structure.
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