| 摘要 |
<p>An elastic surface wave functional device comprises a piezoelectric substrate or a multi-layered piezoelectric substrate (1) having a large electromechanical coupling factor, an active layer (3) of a semiconductor layer having large mobility and formed on the substrate (1), and a buffer layer (2) lattice matching the active layer. Futher, an input electrode (4) and an output electrode (5) are formed on both sides of the semiconductor layer. This elastic surface wave functional device generates a large degree of amplification at a low voltage. A transmission reception circuit of a high-frequency unit of a mobile communication equipment using this elastic surface wave functional device is obtained, too.</p> |
