An antenna is provided as a substrate member, and, as with the antenna, a ground
part is provided as a substrate member. The ground part includes a folded pattern
formed of a copper foil provided on the surface of a substrate material. When a
folded pattern in the antenna and the folded pattern in the ground part are configured
in a length of /4, a pseudo-antenna having a length of /2 can be
formed. In this case, the antenna gain is about 2 dB, that is, the radiation of
the radio wave can be improved. At the same time, the antinoise properties and
the arrival distance of the radio wave can be improved. That is, the above construction
can realize radio equipment which can stably radiate radio waves even under ungroundable
conditions and, at the same time, can realize good characteristics even under low
transmission output conditions.
