| 摘要 |
A combined antenna combining a circularly polarized wave antenna and a vertically polarized wave antenna is provided. A flat plate antenna for ground waves is fixed on a printed board, and a two-point feeding type patch antenna is placed and fixed on a metallic flat plate of the plate antenna. The plate antenna has one feed terminal and six uniformly spaced ground terminals. The patch antenna has two feed pins at equidistant positions from the center of the patch electrode along radial lines that form a right angle. Each of feed pins is connected to a 90-degree phase difference circuit using an opening of the plate antenna. The relative position between the flat plate and the patch electrode is the same along the peripheral direction. All of the feed terminals, the ground terminals and the feed pins have a predetermined positional relationship relative to one another.
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