| Project/Area Number |
02555064
|
|---|
| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
電子通信系統工学
|
|---|
| Research Institution | Faculty of Engineering, Yamanashi University |
|---|
Principal Investigator |
NAKAGAWA Yasuhiko Faculty of engineering, Yamanashi University, Professor, 工学部, 教授 (50006277)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
MOTIDUKI Norihiro キャノン株式会社
SUZUKI Yuzi Faculty of Engineering, Yamanashi University, Associate Professor, 工学部, 講師 (70179266)
|
|---|
| Project Period (FY) |
1990 – 1992
|
| Project Status |
Completed (Fiscal Year 1992)
|
| Budget Amount *help |
¥9,700,000 (Direct Cost: ¥9,700,000)
Fiscal Year 1992: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1991: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 1990: ¥4,500,000 (Direct Cost: ¥4,500,000)
|
|---|
| Keywords | ferroelasticity / Ta_2O_5 thin film / surface acoustic wave / convolver |
|---|
| Research Abstract |
In this research, we get next results,
(1) The first measurement of the material constants of ferroelastic Ta_2O_5 thin films have done. X-axis oriented Ta_2O_5 thin films were deposited on the fused quartz by using the dc diode sputtering method. The material constants were determined from the phase velocity and the electromechanical coupling constant of the bulk waves and the surface acoustic waves propagating on the layered substrate.
(2) The precise analyses of the surface acoustic waveguide characteristics with the Green function have given us a very precise look at the field distribution on a waveguide. With the analytical results we can make a quantitative evaluation of the nonlinear component which was generated on the waveguide and we can further analytically obtain the amount of surface acoustic wave generated by the nonlinear components or the excitation sources and propagating perpendicular to the waveguide. This theory can be extended to the surface acoustic wave convolver using a multichannel waveguide.
(3) We found a new phenomenon of the generation of a second harmonic component of the surface acoustic waves from the dot array which is replaced on the piezoelectric substrate instead of a surface acoustic waveguide. As a result, the direction of propagation for second harmonic can be controlled by frequency and periodic length of dots.
|
