| 摘要 |
<p>Parabolic antenna made from several layers of vacuumformed plastic. A first front vacuumshaped shell (1) consists in its turn of a rear supporting layer (2), a metal layer (3) for reflection of radiation and a front protective layer (4), behind this front shell an air space, behind this an insulation (9) and finally a rear enclosing shell (5). The shells are at the outer edge interconnected, sealed and provided with elastic fastening means (10). </p> |
