| 摘要 |
PROBLEM TO BE SOLVED: To secure a directivity characteristic where the side lobe level is lowered by arranging plural basic elements at many stages and in an isoscales triangle shape. SOLUTION: The rectangular basic elements 10 are arranged on many stages and in an isoscales triangle shape so that the lines connecting together the corner parts 1a-5a and 1b-5b of the elements 10 of every stage which have no contacts to the elements 10 of the next stage form two equal sides 11a and 11b of the isoscales triangle. In this case, the elements 10 are arranged on many stages and in the shorter side directions of elements 10 so that the shorter sides of elements 10 of every stage cross the center parts of longer sides of the elements 10 of the next stage respectively. A single element 10 consists of a rectangle formed by a linear conductor, for example. Then a ratio between a shorter side L2 and a longer side L1 of the triangle of an element 10 is set at about 1:2. Thus, the maximum radiation direction of a radiation beam can be set vertical against the rectangular surface of the rectangular element 10.
|
