| 摘要 |
<p>A frequency selective surface or dichroic structure has an array of elements (1) each of which comprises at least two substantially concentric symmetrical closed figures (2, 3). For example, the element array may be a regular array of identical double-squares. Other polygons, or ellipses, may alternatively be used as the closed figures. The closed figures may be formed as conductive paths on a dielectric substrate or, alternatively, the Babinet complement of such a structure may be used. </p> |
