| 摘要 |
PURPOSE:To obtain a reflecting plate which has the satisfactory weather resistance with no variation of the radio wave reflection characteristics, by laminating a thermoplastic resin layer having satisfactory weather resistance, at least a type of shape matter selected out of groups consisting of metallic mats, cloths and nets and a polycarbonate resin layer containing an inorganic filler to form a reflecting plate. CONSTITUTION:A reflecting plate for circular polarized antenna is produced by laminating successively a thermoplastic resin layer 3 having the satisfactory weather resistance, a shpae material 2 selected out of the groups consisting of metallic mats, cloths and nets, and a polycarbonate resin layer 1 containing an inorganic filler. The thickness of the layer 3 is set at 5mu-5mm.; the material 2 is finer than two meshes; and the thickness of the layer 1 is set at 500mu-15mm. respectively. Then the layer 1 contains 10-80wt% inorganic filler. This inorganic compound which has no reaction to oxygen nor water and is not decomposed when it is kneaded or molded. |
