RFID tag and manufacturing method thereof

• US 7,598,873 B2
• Filed: 07/26/2006
• Issued: 10/06/2009
• Est. Priority Date: 03/30/2006
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Kai, Manabu, Maniwa, Toru, Yamagajo, Takashi
• Primary Examiner(s): Nguyen; Phung
• Application Number:
  US11/492,941
• Publication Number:
  US 20070229276A1
• Time in Patent Office: 1,168 Days
• Field of Search: 3405721-5728, 343/728, 343/748
• US Class Current: 340/572.7
• CPC Class Codes: G06K 19/07786 the antenna being of the HF type, such as a dipole
• CPC Class Codes: H01Q 1/22 by structural association with other equipment or articles
• CPC Class Codes: H01Q 1/2225 used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: H01Q 7/04 Screened antennas H01Q7/02, H01Q7/06 take precedence

Abstract

A RFID tag having a loop antenna comprises: a flat plate shaped dielectric member 51; first and second loop antenna patterns 52, 53 that are formed on a first and second surface of the dielectric member 51 so that they are separated from each other by a specified space, and so that each is continuous from the first surface to the second surface of the dielectric member 51; and an IC chip 54 that electrically connects the first and second loop antenna patterns 52, 53 on one of the surfaces.

Claims

1. An RFID tag having a loop antenna and comprising:

a flat plate shaped dielectric member;

first and second loop antenna patterns that are formed on a first and second surface of said dielectric member so that they are separated from each other by a specified space on both said first and second surface, and so that each is continuous from the first surface to the second surface of the dielectric member; and

an IC chip that electrically connects said first and second loop antenna patterns on one of said surfaces.

2. The RFID tag of claim 1 wherein said first and second loop antenna patterns comprise IC chip-mounting sections on which said IC chip is mounted, and said IC chip-mounting sections are formed on said dielectric member so that they face each other and are separated from each other by a specified space.

4. The RFID tag of claim 1 or claim 3 wherein the surface opposite from said IC chip-mounting surface is attached to a conductive body by way of an insulating layer.

3. An RFID tag having a loop antenna and comprising:

a flat plate shaped dielectric member;

an insulating film on which first and second band-shaped loop antennas comprising IC chip-mounting sections are formed so that the IC chip-mounting sections face each other and are separated from each other by a specified space; and

an IC chip that is mounted on said IC chip-mounting sections and is electrically connected to said first and second loop antennas;

wherein said insulating film on which said IC chip is mounted is wrapped around said dielectric member so that said IC chip is located on a first surface of said dielectric member, and said first and second loop antenna patterns are located on a second surface of said dielectric member so that they are separated from each other by a specified space.

5. An RFID tag having a loop antenna and comprising:

a flat plate shaped dielectric member;

first and second loop antenna patterns that are formed on a first and second surface of said dielectric member so that they are separated from each other by a specified space on both said first and second surface, and so that each is continuous from the first surface to the second surface of the dielectric member;

an IC chip that electrically connects said first and second loop antenna patterns on one of said surfaces; and

an insulating layer and conductive layer that are layered on the surface opposite from said IC chip-mounting surface.

6. The RFID tag of claim 5 wherein said first and second loop antenna patterns comprise IC chip-mounting sections on which said IC chip is mounted, and said IC chip-mounting sections are formed on said dielectric member so that they face each other and are separated from each other by a specified space.

7. An RFID tag having a loop antenna and comprising:

a flat plate shaped dielectric member;

an insulating film on which first and second band-shaped loop antennas comprising IC chip-mounting sections are formed so that the IC chip-mounting sections face each other and are separated from each other by a specified space;

an IC chip that is mounted on said IC chip-mounting sections and is electrically connected to said first and second loop antennas; and

an insulating layer and conductive layer that are layered on the surface opposite from the IC chip mounting surface;

wherein said insulating film on which said IC chip is mounted is wrapped around said dielectric member so that said IC chip is located on a first surface of said dielectric member, and said first and second loop antenna patterns are located on a second surface of said dielectric member so that they are separated from each other by a specified space.

8. A method for manufacturing a RFID tag having a loop antenna comprising:

a step of forming first and second band-shaped loop antenna patterns that comprise IC chip-mounting sections on an insulating film so that the IC chip-mounting sections face each other and are separated from each other by a specified space;

a step of mounting an IC chip on said IC chip-mounting sections of said first and second loop antenna patterns, and electrically connecting said IC chip to said first and second loop antenna patterns; and

a step of wrapping and fastening said insulating film on which said IC chip is mounted around a flat plate shaped dielectric member so that said IC chip is located on a first surface of said dielectric member, and said first and second loop antenna patterns are located on a second surface of said dielectric member so that they are separated from each other by a specified space.

9. A method for manufacturing a RFID tag having a loop antenna comprising:

a step of forming first and second band-shaped loop patterns that comprise IC chip-mounting sections on an insulating film so that the IC chip-mounting sections face each other and are separated from each other by a specified space;

a step of mounting an IC chip on said IC chip-mounting sections of said first and second loop antenna patterns, and electrically connecting said IC chip to said first and second loop antenna patterns;

a step of wrapping and fastening said insulating film on which said IC chip is mounted around a flat plate shaped dielectric member so that said IC chip is located on a first surface of said dielectric member, and said first and second loop antenna patterns are located on a second surface of said dielectric member so that they are separated from each other by a specified space; and

a step of layering an insulating layer and conductive layer on the surface opposite from said IC chip mounting surface.