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:
Oct. 21, 2008
Filed:
Apr. 28, 2006
Applicant:
Kouichi Uesaka, Yokohama, JP;
Inventor:
Kouichi Uesaka, Yokohama, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01Q 1/36 (2006.01); G06K 19/07 (2006.01);
U.S. Cl.
CPC ...
Abstract
To provide an RFID (a signal processing circuit) equipped with a single rectangular spiral antenna and being capable of transmitting and receiving an electric power and signal by a plurality of frequency bands therewith, the present invention limits a longitudinal dimension (long sides) of the rectangular spiral antenna designed for transmission and reception of carrier of the HF band thereby to the length suitable for transmission and reception of carrier of the UHF band thereby as well as a widthwise dimension thereof so as to prevent a current waveform due to the carrier of the UHF band from reversing in phase at one of the long sides thereof.