| 摘要 |
An antenna excitor (2) for two different frequency bands is described in which a tube section (4) having a circular internal cross-section is connected to a polarising diplexer (3) for two orthogonal, nearly polarised electromagnetic waves fed through waveguides 5 and 6. At least one waveguide (7) opens into the tube section (4). A second waveguide (8) can be connected to the tube section (4); it can be connected thereto in the manner of a directional coupler offset by 90 DEG in the peripheral direction at the same point along the axis as the first waveguide (7) as shown in dotted outline, or again it can be connected thereto at an axially offset point, as shown in full lines. <IMAGE> |
