| 摘要 |
A satellite antenna apparatus 2 comprises a reflector dish 4 and an elongate member 8 supporting at least one data processing component 14 - 16 where at least a portion 18 of the elongate member 8 is formed with a shape change therein. The shape change portion 18 may face the reflector dish 4. The shape change may be a curved, stepped or V-shaped recessed portion located between the dish 4 and the at least one data processing component 14 -16. The elongate member 8 may pass through the dish 4 at an aperture 12 located towards the bottom edge of the dish. The at least one data processing component may include a horn 14, a waveguide 15 and a low noise block 16 which is/are arranged for transmitting or receiving satellite signals via the dish reflector 4. The apparatus 2 may be wall or pole mounted. Also disclosed is an antenna apparatus, or an elongate member, comprising an elongate member with a recess formed along at least a portion and possibly along the full length of the said member. The recessed shaped portion may be arranged to reduce reflections and hence allow the polarisation patterns of the antenna apparatus to lie within predetermined radiation pattern envelope limits. |
