| 摘要 |
[PROBLEM] To provide a metal-plate lens that can be easily created even for high-frequency bands. [Solution] Metal plates (10a-15b) are disposed parallel to the x-z plane so as to be stacked at predetermined intervals, where the z axis is the central axis, and the axes that are orthogonal to the z axis are the x axis and y axis. The plates (11a-15b) other than the uppermost plate (10a) and lowermost plate (10b) have a plurality of through holes formed therein. In this case, central plates (15a, 15b) have through holes having first diameters formed therein, and intermediate plates (11a-14b), which are disposed between central plate (15a) and the uppermost plate (10a) and between central plate (15b) and the lowermost plate (10b) have, formed therein, through holes having second diameters that are smaller than the first diameters. The second diameters of through holes formed in intermediate plates that are disposed further from the central plates (15a, 15b) are made to be smaller than the second diameters of through holes formed in intermediate plates that are disposed closer to the central plates (15a, 15b). |
