RFID tag and manufacturing method thereof

• US 8,022,878 B2
• Filed: 07/31/2007
• Issued: 09/20/2011
• Est. Priority Date: 08/09/2006
• Status: Expired due to Fees

• Current Assignee: Fujitsu Frontech Limited (Fujitsu Limited), Fujitsu Limited
• Original Assignee: Fujitsu Frontech Limited (Fujitsu Limited), Fujitsu Limited
• Inventors: Sugimura, Yoshiyasu, Kai, Manabu, Baba, Shunji, Maniwa, Toru, Yamagajo, Takashi, Oishi, Yasuyuki
• Primary Examiner(s): Dinh; Trinh V
• Application Number:
  US11/882,232
• Publication Number:
  US 20080036673A1
• Time in Patent Office: 1,512 Days
• Field of Search: None
• US Class Current: 343/700.0MS
• CPC Class Codes: G06K 19/07749 the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
• CPC Class Codes: G06K 19/07786 the antenna being of the HF type, such as a dipole
• CPC Class Codes: H01Q 1/2208 associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems methods or arrangements for sensing record carriers, e.g. for reading patterns G06K7/00; record carrier for use with machines and with at least a part designed to carry digital markings G06K19/00
• CPC Class Codes: H01Q 21/29 Combinations of different interacting antenna units for giving a desired directional characteristic H01Q25/00 takes precedence
• CPC Class Codes: H01Q 9/0457 electromagnetically coupled to the feed line
• CPC Class Codes: Y10T 29/49016 Antenna or wave energy "plumbing" making

Abstract

An RFID tag having a tag antenna and an LSI chip, comprising: a power-supply pattern on which the LSI chip is mounted; a patch antenna that functions as the tag antenna; and a high-frequency connection section that makes a high-frequency connection between the power-supply pattern and the patch antenna. The high-frequency connection section is formed, for example, by forming a slot in the patch antenna, layering one end of a small dipole antenna that functions as the power-supply pattern over the slot so that it crosses over the slot, and supplying power from the small dipole antenna to the patch antenna.

Claims

1. A tag having a patch antenna that functions as the tag antenna, comprising:

a small dipole antenna having two straight sections connected at a bent section, one end of the straight sections being located inside a cutout section of the patch antenna, the cutout section being straight and extending from the center of an edge toward the inside of the patch antenna;

a loop pattern connected to the small dipole antenna and functioning as a parallel inductor; and

an LSI chip mounted to the small dipole antenna near the bent section;

wherein

in operation, a high-frequency connection between the small dipole antenna and the patch antenna is realized by way of the cutout section, by which high-frequency connection power is electromagnetically supplied from the small dipole antenna to the patch antenna.

2. The RFID tag of claim 1 further comprising:

a dielectric member having said small dipole antenna, said loop pattern, said LSI chip and said patch antenna formed on one side, and a conductive pattern that functions as a ground formed on the other side.