| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna system, using a helical antenna that copes with a different polarized wave and a different frequency and has a communication efficiency that does not deteriorate. SOLUTION: A primary radiator 200 is placed to a concaved middle part of a parabolic reflector 110, and the primary radiator 200 consists of two helical antennas 210, 220. The diameter of the helical antenna 210 differs from the diameter of the helical antenna 220 and the helical antenna 220 with a smaller diameter is placed on the inside of the helical antenna 220 with the larger diameter, while using the center axes in common. Moreover, the helical antennas cope with a polarized wave and consist of a helical antenna 220a wound in the reverse direction or a helical antenna 220b wound in the same direction.
|
