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.
