| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Outline of Final Research Achievements |
For the evolution of next-generation mobile communication systems, surface acoustic wave (SAW) devices with higher frequency are strongly demanded. The longitudinal-type leaky surface acoustic wave (LLSAW) has advantageous for application to high-frequency SAW devices since LLSAWs have a higher phase velocity than the general SAWs. However, LLSAWs exhibit inherent attenuation because they lose energy by continuously radiating bulk waves into the substrate. In this study, it was found experimentally for the LLSAW propagating on LiNbO3 substrate that, the losses can be reduced by loading with a ScAlN thin film with a higher velocity than the substrate. Moreover, it was also found theoretically and experimentally that when the LiNbO3 or LiTaO3 thin plate with a smaller thickness than one wavelength bonded to an quartz or sapphire substrate with a high phase velocity, the electromechanical coupling factor of the LLSAW was increased to two to three times that in the single substrate.
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