Radio equipment

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2005-06-07

2005-06-07

Chen, Shih-Chao (Department: 2821)

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

C343S829000, C343S850000

Reexamination Certificate

active

06903702

ABSTRACT:
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 λ/4, a pseudo-antenna having a length of λ/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.

REFERENCES:
patent: 5181025 (1993-01-01), Ferguson et al.
patent: 2004/0032377 (2004-02-01), Forster et al.

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