| 摘要 |
PURPOSE:To prevent characteristic degradation due to electrode reflection and diffraction and also to attain ease of coupling with an external circuit by prolonging the non-crossing part of all interdigital electrodes of a comb-tooth electrode. CONSTITUTION:The electrode pattern is formed on an LiNbO3 substrate. A normal type input electrode 2 having a crossing part 18 with a length W of 200mum and non-crossing parts 19, 19' having a length W', W'' each of 1,200mum and an output electrode 2' with cross width weighting having the same effective aperture and non-crossing part as those of the normal type input electrode are formed with pure Al as the electrode material, a film thickness of 0.1mum and electrode width and space of 1.2mum, the center frequency is 400MHz, the number of pairs of the input normal electrode is 14 pairs, the number of pairs of the output weighted electrode is 60 pairs and the 3dB band width is 30MHz. The radiation conductance at the center frequency is 5.6mm. mohs, the electrode finger conductance Gf of the normal type electrode 2 is 69.1mm. mohs, and the major crossing part of the weighted electrode is dominant to its electrode finger conductance Gf and it is the same as that of the normal type equivalently. |
