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:
Jan. 20, 2004
Filed:
Jan. 31, 2002
Toshiya Kitagawa, Kyoto, JP;
Omron Corporation, Kyoto, JP;
Abstract
There is provided an antenna apparatus in which a non-detection region is made minimum within the regulatory limit of radio wave radiation, and satisfactory communication is enabled over a wide range. Four substantially square antennas are adjacently arranged on the same plane to constitute an antenna assembly, which is arranged to be opposite to a similar antenna assembly. Reverse phase currents flow to the first antenna and the third antenna, and similarly, reverse phase currents flow to the second antenna and the fourth antenna. The second and the fourth antennas are subjected to phase inversion for every data communication between a pattern in which same phase currents flow to the second antenna and the third antenna and a pattern in which same phase currents flow to the first antenna and the second antenna. A predetermined phase difference is provided between the first and the second antenna assemblies.