| Project/Area Number |
01550297
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
電子機器工学
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| Research Institution | Hokkaido University |
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Principal Investigator |
KOSHIBA Masanori Hokkaido University, Fac. of Engineering, Professor, 工学部, 教授 (40101521)
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| Project Period (FY) |
1989 – 1990
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| Project Status |
Completed (Fiscal Year 1990)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1990: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1989: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Surface acoustic wave (SAW) / SAW interdigital transducer / SAW reflector / SAW resonator / Finite element method / Numerical analysis / Coupled mode theory / Equivalent network theory |
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| Research Abstract |
The performance of a CAD system for the design of SAW (surface acoustic wave) devices is limited by the accuracy of the simulation procedure. A precise simulation of SAW devices must take into account pure electric, acoustic, and mixed electroacoustic effects. The purpose of this project is to develop an high-level design system for various SAW devices. Results obtained are as follows:
1. A numerical approach based on the finite element method has been developed for the analysis of arbitrarily shaped periodic SAW waveguides which frequently appear in the actual SAW devices, such as SAW interdigital transducer (IDT), SAW reflector, and SAW resonator.
2. An equivalent network theory and a coupled mode theory are developed for the analysis of excitation characteristics of SAW-IDT and of reflection characteristics of SAW qratings. Circuit parameters of equivalent networks and coupling and transduction coefficients of coupled mode equations can be theoretically determined by applying the finite element method to an infinite array corresponding to an electrically shorted or open IDT. The finite element method is also used to calculate the static capacitance for one pair of IDTs.
3. A unified numerical approach based on the finite element method is developed for the magnetostatic wave propagation in a YIG film.
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