RFID tag, RFID-tag antenna, RFID-tag antenna sheet, and method of manufacturing RFID tag

• US 7,540,428 B2
• Filed: 11/29/2004
• Issued: 06/02/2009
• Est. Priority Date: 08/31/2004
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Baba, Shunji, Ishikawa, Naoki, Kobayashi, Hiroshi, Yamakami, Takatoyo, Katayama, Masumi
• Primary Examiner(s): Frech; Karl D.
• Application Number:
  US10/998,138
• Publication Number:
  US 20060043199A1
• Time in Patent Office: 1,646 Days
• Field of Search: 235/492, 235/451, 340/572.01, 340/572.04, 340/10.1
• US Class Current: 235/492
• CPC Class Codes: A63B 2225/54 Transponders, e.g. RFID
• CPC Class Codes: A63B 43/00 Balls with special arrangements
• 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 19/07758 arrangements for adhering the record carrier to further objects or living beings, functioning as an identification tag
• 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 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

Abstract

A radio-frequency-identification tag antenna includes a film base, a plurality of antenna patterns for transmission and reception, which is formed in parallel on the film base, and a cut line that is formed on the film base between adjacent antenna patterns along the antenna patterns from an inside to an outer edge of the film base. A part of the film base on which the antenna patterns are formed is folded or bent in a predetermined direction using the cut line.

Claims

1. A radio-frequency-identification tag antenna comprising:

a film base having a rectangular shape and having pads for mounting a chip;

a first antenna pattern and a second antenna pattern that are disposed on the film base to be connected to the chip via the pads for transmission and reception, the first antenna pattern extending along longitudinal side of the film base, the second antenna pattern extending in parallel with the first antenna pattern; and

a cut line that is formed on the film base between the first and the second antenna patterns along the first and the second antenna patterns from an inside near the pads to an outer edge of the film base,

wherein the second antenna pattern has a folding section and when the second antenna pattern is folded or bent at the folding section, the second antenna pattern has a portion extending from the rectangular shape in a predetermined direction,

wherein the first and the second antenna patterns are formed on at least one of a front surface and a back surface of the film base, and

wherein when the first and the second antenna patterns are formed on both the front surface and the back surface of the film base, conductive through-holes, through which the first and the second antenna patterns formed on the front surface and the back surface become conductive, are provided on the film base.

2. A radio-frequency-identification tag antenna comprising:

a film base having a rectangular shape and having pads for mounting a chip;

a first antenna pattern and a second antenna pattern that are disposed on the film base to be connected to the chip via the pads for transmission and reception. the first antenna pattern extending along a longitudinal side of the film base, the second antenna pattern extending in parallel with the first antenna pattern;

a cut line that is formed on the film base between the first and the second antenna patterns along the first and the second antenna patterns from an inside near the pads to an outer edge of the film base; and

an integrated-circuit chip that incorporates a communication circuit and a memory circuit, the integrated-circuit chin being electrically connected to the first and the second antenna patterns via the pads,

wherein the second antenna pattern has a folding section and when the second antenna pattern is folded or bent at the folding, section, the second antenna pattern has a portion extending from the rectangular shape in a predetermined direction, and

wherein surfaces of the first and the second antenna patterns and a surface of the integrated-circuit chip are covered with an insulating member.

3. A radio-frequency-identification tag antenna comprising:

a film base having a rectangular shape and having pads for mounting a chip;

a first antenna pattern and a second antenna pattern that are disposed on the film base to be connected to the chip via the pads for transmission and reception, the first antenna pattern extending along a longitudinal side of the film base, the second antenna pattern extending in parallel with the first antenna pattern;

a cut line that is formed on the film base between the first and the second antenna patterns along the first and the second antenna patterns from inside near the pads to an outer edge of the film base; and

an integrated-circuit chin that incorporates a communication circuit and a memory circuit, the integrated-circuit chip being electrically connected to the first and the second antenna patterns via the pads,

wherein the second antenna pattern has a folding section and when the second antenna pattern is folded or bent at the folding section, the second antenna pattern has a portion extending from the rectangular shape in a predetermined direction, and

wherein the first and the second antenna patterns are formed on at least one of a front surface and a back surface of the film base.

4. The radio-frequency-identification tag according to claim 3, wherein when the first and the second antenna patterns are formed on both the front surface and the back surface of the film base, conductive through-holes, through which the first and the second antenna patterns formed on the front surface and the back surface become conductive, are provided on the film base.

5. A radio-frequency-identification tag antenna comprising:

a film base having a rectangular shape and having pads for mounting chip;

a first antenna pattern and a second antenna pattern that are disposed on the film base to be connected to the chip via the pads for transmission and reception, the first antenna pattern extending along a longitudinal side of the film base, the second antenna pattern extending in parallel with the first antenna pattern;

a cut line that is formed on the film base between the first and the second antenna patterns along the first and the second antenna pattern from an inside near the pads to an outer edge of the film base; and

an integrated-circuit chip tat incorporates a communication circuit and a memory circuit, the integrated-circuit chip being electrically connected to the first and the second antenna patterns via the pads,

wherein the second antenna pattern has a folding section and when the second antenna pattern is folded or bent at the folding section, the second antenna pattern has a portion extending from the rectangular shape in a predetermined direction,

wherein the film base is folded once or more than once at a predetermined angle so that the first and the second antenna patterns together form a plane antenna as a whole, and

wherein the film base corresponding to the second antenna pattern is folded more than once so that the second antenna pattern forms a spiral shape as a whole on a substantially same plane.

6. A radio-frequency-identification tag antenna comprising:

a film base having rectangular shape and having pads for mounting a chip;

a first antenna pattern and a second antenna pattern that are disposed on the film base to be connected to the chip via the pads for transmission and reception, the first antenna pattern extending along a longitudinal side of the film base, the second antenna pattern extending in parallel with the first antenna pattern;

cut line that is formed the film between the first and the second antenna patterns along the first and the second antenna patterns from an inside near the pads to an outer edge of the film base; and

an integrated-circuit chip that incorporates a communication circuit and a memory circuit, the integrated-circuit chip being electrically connected to the first and the second antenna patterns via the pads,

wherein the second antenna pattern has a folding section and when the second antenna pattern is folded or bent at the folding section, the second antenna pattern has a portion extending from the rectangular shape in a predetermined direction,

wherein the film base is folded once or more than once at a predetermined angle so that the first and the second antenna patterns are non-coplanar and form a three-dimensional antenna as a whole, and

wherein the corresponding film base is bent helically so that a part of or the whole antenna has a helical shape.

7. A radio-frequency-identification tag antenna comprising:

a film base having a rectangular shape and having pads for mounting a chip;

a first antenna pattern and a second antenna pattern that are disposed on the film base to be connected to the chip via the pads for transmission and reception, the first antenna pattern extending along a longitudinal side of the film base, the second antenna pattern extending in parallel with the first antenna pattern;

a cut line tat is formed on the film base between the first and the second antenna patterns along the first and the second antenna patterns from an inside near the pads to an outer edge of the film base; and

an integrated-circuit chip that incorporates a communication circuit and a memory circuit. the integrated-circuit chip being electrically connected to the first and the second antenna patterns via the pads,

wherein the second antenna pattern has a folding section and when the second antenna pattern is folded or bent at the folding section, the second antenna pattern has a portion extending from the rectangular shape in a predetermined direction,

wherein the film base is folded once or more than once at a predetermined angle so that the first and the second antenna patterns are non-coplanar and form a three-dimensional antenna as a whole, and

wherein both ends of the film base including the first and the second antenna patterns are connected together to form a loop antenna by electrically connecting the both ends of the first and the second antenna patterns that extend on a same straight line.

8. The radio-frequency-identification tag according to claim 7, wherein the both ends of the first and the second antenna patterns to be connected are coated with a conductive adhesive that exhibits a predetermined adhesive force by pressing and heating.

9. A sheet for manufacturing a plurality of radio-frequency-identification tag antennas, the sheet comprising:

a plurality of radio-frequency-identification tag antennas arranged in a longitudinal direction and in a width direction; and

severance lines between the plurality of radio-frequency-identification tag antennas, wherein each of the plurality of radio-frequency-identification tag antennas includes

a film base having a rectangular shape and having pads for mounting a chip;

a first antenna pattern and a second antenna pattern that are disposed on the film base to be connected to the chip via the pads for transmission and reception, the first antenna pattern extending along a longitudinal side of the film base, the second antenna pattern extending in parallel with the first antenna pattern; and

a cut line that is formed on the film base between the first and the second antenna patterns along the first and the second antenna patterns from an inside near the pads to an outer edge of the film base.

10. The sheet according to claim 9, wherein each of the plurality of radio-frequency-identification tag antennas further includes an integrated-circuit chip that incorporates a communication circuit and a memory circuit and is electrically connected to the first and the second antenna patterns.

11. The sheet according to claim 10, wherein a surface of each of the first and the second antenna patterns and a surface of each of the integrated-circuit chips are covered with an insulating member respectively.