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:
Nov. 09, 2004
Filed:
Jan. 28, 2003
Junichi Noro, Akita, JP;
Masaaki Miyata, Atsugi, JP;
Isao Fukae, Chofu, JP;
Akira Miyoshi, Hachiouji, JP;
Toshihiko Inaba, Akita, JP;
Kenichi Taguchi, Akita, JP;
Takashi Horikawa, Takamatsu, JP;
Wataru Sakaguchi, Kagawa, JP;
Mitsumi Electric Co., Ltd., Tokyo, JP;
Abstract
In an electromagnetic coupling type four-point feeding loop antenna ( ) comprising a tubular body ( ), a loop portion ( ) having a loop width (W ), four feeders ( ) each having a feeder width (W ), and four electromagnetic coupling wires ( ) each having a coupling wire width (W ), the loop width, the feeder width, and the coupling wire width are substantially equal to one another. A gap (&dgr;) between the feeder and the electromagnetic coupling wire is laid in a range between 0.2 mm and 0.8 mm, both inclusive, when the electromagnetic coupling type four-point feeding loop antenna has a feeding impedance of a range between 25 &OHgr; and 100 &OHgr;, both inclusive.