Method of manufacturing antenna for RFID tag

• US 7,421,775 B2
• Filed: 07/01/2005
• Issued: 09/09/2008
• Est. Priority Date: 12/28/2004
• Status: Expired due to Fees

• Current Assignee: Hanwha Techwin Co., Ltd. (Hanwha Corporation)
• Original Assignee: Samsung Techwin Corporation (Hanwha Corporation)
• Inventors: Kwak, Jae-hyun, Kim, Soo-ho, Lim, Se-jin
• Primary Examiner(s): TRINH, MINH N
• Application Number:
  US11/173,618
• Publication Number:
  US 20060143898A1
• Time in Patent Office: 1,166 Days
• Field of Search: 29600-601, 29830-831, 295/921, 295/93, 343/700.MS, 343/809, 343/795, 343/767, 3405721-5728, 340/10.34, 156/272.2
• US Class Current: 29/600
• 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 19/07779 the inductive antenna being a coil
• CPC Class Codes: G06K 19/07783 the coil being planar
• 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: H05K 2203/052 Magnetographic patterning
• CPC Class Codes: H05K 3/102 by bonding of conductive powder, i.e. metallic powder H05K3/12 takes precedence
• CPC Class Codes: H05K 3/207 using a prefabricated paste pattern, ink pattern or powder pattern
• CPC Class Codes: H05K 3/386 by the use of an organic polymeric bonding layer, e.g. adhesive
• CPC Class Codes: Y10T 29/49002 Electrical device making
• CPC Class Codes: Y10T 29/49016 Antenna or wave energy "plumbing" making
• CPC Class Codes: Y10T 29/49018 with other electrical component
• CPC Class Codes: Y10T 29/49128 Assembling formed circuit to base

Abstract

A method of easily and inexpensively manufacturing an antenna for an RFID tag by forming the antenna using magnets of a pattern corresponding to a shape of the antenna is provided. One example method includes a) placing a substrate above a level of a fluid containing a conductive substance, b) placing a magnet (e.g., an electromagnet including an electrode) formed in a shape of an antenna pattern above a surface of the substrate, and adhering the conductive substance to a bottom of the substrate in the shape of the antenna pattern by a magnetic force, and c) fixing the conductive substance adhered to the bottom of the substrate.

Claims

1. A method of manufacturing an antenna for an RFID tag, the method comprising:

orienting at least one magnet configured to produce a magnetic field that has a desired antenna shape above and substantially proximate to a container holding a fluid containing a conductive substance to attract the conductive substance from the container;

disposing a nonconductive substrate between the at least one magnet and the container;

forming a conductive pattern corresponding to the antenna shape of the magnetic field on a bottom surface of the nonconductive substrate; and

fixing the formed conductive pattern to the bottom surface of the nonconductive substrate to form the antenna.

2. The method of claim 1 wherein the orienting step comprises arranging a plurality of magnets in an array so that a plurality of conductive patterns are formed simultaneously on the bottom surface of the nonconductive substrate.

3. The method of claim 2 further comprising, after the fixing step, the step of separating the plurality of conductive patterns from each other.

4. The method of claim 1 wherein the forming step comprises energizing the at least one magnet to produce the magnetic field.

5. The method of claim 4 wherein the energizing step persists during the fixing step.

6. The method of claim 1 wherein the fixing step comprises applying a fixing liquid on the conductive pattern.

7. The method of claim 1 wherein the fixing step comprises attaching a protective sheet on the conductive pattern.