| 摘要 |
PURPOSE:To obtain an approximately equal level of intensity among electric fields generated at each position by setting a fixed distance between adjacent electrode fingers of a comb-shaped electrode used in a surface acoustic wave device. CONSTITUTION:Electrode fingers 2a and 3a extended from comb-shaped electrodes 2 and 3 cross to each other, and the distance between these adjacent fingers 2a and 3a, i.e., the distance G between electrode fingers of different polarities is set constant at each position. Therefore the electric field intensity is approximately equal at each position even in case the weighting is applied with variations of cross widths L1, L2... and distances P1, P2... between electrode fingers of same polarity. Thus the even exciting efficiency is obtained at each position, and the characteristics approximate to the designed ones can be obtained with a surface acoustic wave device. |
