The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 07, 2005
Filed:
Jan. 28, 2003
Shigekazu Kawai, Gunma-ken, JP;
Tsutomu Ishikura, Gunma-ken, JP;
Yutaka Saito, Saitama-ken, JP;
Tsutomu Tanaka, Kanagawa-ken, JP;
Kazuo Matsubara, Saitama-ken, JP;
Shigekazu Kawai, Gunma-ken, JP;
Tsutomu Ishikura, Gunma-ken, JP;
Yutaka Saito, Saitama-ken, JP;
Tsutomu Tanaka, Kanagawa-ken, JP;
Kazuo Matsubara, Saitama-ken, JP;
Sanyo Electric Co., Ltd., Osaha-fu, JP;
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.