RFID TAG AND METHOD FOR READING THE SAME
First Claim
1. An RFID tag usable by being mounted on a conductor, comprising:
- a first antenna disposed on said conductor, said first antenna having an IC chip mounted thereon;
a second antenna disposed so as to be electromagnetically coupled to said first antenna and resonate at a predetermined communication frequency;
a first spacer holding said first antenna away from said conductor; and
a second spacer holding said second antenna away from said first antenna,wherein the length of said first antenna is shorter than the length of said second antenna.
1 Assignment
0 Petitions
Accused Products
Abstract
A RFID tag for accommodation in a narrow clearance in an electronic device and providing a predetermined communication distance even if a displacement occurs between first and second antennas. First antenna is mounted through first spacer to metal case surface and second antenna mounted to resin container surface facing the first antenna. The dielectric resin container functions as a second spacer. Only the first spacer and first antenna are accommodated in the narrow clearance between metal case and resin container, the tag can be mounted even in an electronic device with a small redundant space and small size. First antenna is shorter than second antenna so that a required communication distance may be obtained even if their relative position is changed.
39 Citations
20 Claims
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1. An RFID tag usable by being mounted on a conductor, comprising:
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a first antenna disposed on said conductor, said first antenna having an IC chip mounted thereon; a second antenna disposed so as to be electromagnetically coupled to said first antenna and resonate at a predetermined communication frequency; a first spacer holding said first antenna away from said conductor; and a second spacer holding said second antenna away from said first antenna, wherein the length of said first antenna is shorter than the length of said second antenna. - View Dependent Claims (2, 3, 4)
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5. An RFID tag usable by being mounted on an electronic device having a conductor-made case and a non-conductor-made container for packaging said case, comprising:
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a first antenna disposed on said case, said first antenna having an IC chip mounted thereon; a second antenna disposed so as to be electromagnetically coupled to said first antenna and resonate at a predetermined communication frequency; a first spacer holding said first antenna while separating said first antenna from said conductor; and a second spacer holding said second antenna while separating said second spacer from said first antenna, wherein said container is used as said second spacer, and wherein the length of said first antenna is shorter than the length of said second antenna. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for reading an RFID tag usable by being mounted on an electronic device having a conductor-made case and a dielectric-made container for packaging said case, said RFID tag comprising a first antenna disposed on said case, said first antenna having an IC chip mounted thereon;
- a second antenna disposed so as to be electromagnetically coupled to said first antenna and resonate at a predetermined communication frequency;
a first spacer holding said fist antenna away from said conductor; and
a second spacer holding said second antenna away from said first antenna,wherein said container is used as said second spacer; wherein the length of said first antenna is shorter than the length of said second antenna; and wherein when said RFID tag is to be read, said second antenna is mounted and for other than when said RFID tag is to be read, said second antenna is removed. - View Dependent Claims (18, 19, 20)
- a second antenna disposed so as to be electromagnetically coupled to said first antenna and resonate at a predetermined communication frequency;
Specification