RFID tag and manufacturing method thereof

• US 8,462,052 B2
• Filed: 08/10/2011
• Issued: 06/11/2013
• Est. Priority Date: 08/09/2006
• Status: Expired due to Fees

• Current Assignee: Fujitsu Frontech Limited (Fujitsu Limited), Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Yamagajo, Takashi, Maniwa, Toru, Kai, Manabu, Oishi, Yasuyuki, Sugimura, Yoshiyasu, Baba, Shunji
• Primary Examiner(s): DINH, TRINH VO
• Application Number:
  US13/206,901
• Publication Number:
  US 20110284643A1
• Time in Patent Office: 671 Days
• Field of Search: None
• US Class Current: 343/700.MS
• 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 tag antenna and an LSI chip, comprising:

a power-supply pattern (63) on which the LSI chip (64) is mounted;

a patch antenna (62) that functions as the tag antenna and does not have a DC connection to the power-supply pattern; and

a high-frequency connection section (62a) that makes the patch antenna couple to the power-supply pattern electromagnetically, wherein

the power-supply pattern, the patch antenna and the high-frequency connection section are formed on a surface of a double-sided print board (61), and

the power-supply pattern comprises a loop pattern and high-frequency connection section (62a) is formed by forming a shallow cutout section at a side end section of the patch antenna, and wherein only a part of the loop pattern is located in the cutout section.