Multi-loop antenna for radio frequency identification (RFID) communication
First Claim
1. An antenna for interrogating radio frequency identification (RFID) tags having a maximum dimension M, the antenna comprising a plurality of conductive loops to produce an electromagnetic field for RFID communication with the RFID tags, wherein the conductive loops are spaced apart at least a distance D, wherein D≧
- M.
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Accused Products
Abstract
A multi-loop antenna is described having a plurality of conductive loops to produce an electromagnetic field for radio frequency identification (RFID) communication with RFID tags. The conductive loops are spaced apart at least a distance that is selected based on a dimension of the RFID tags with which the antenna communicates. In this manner, the loops are positioned and spaced in a manner that reduces the size of the holes within the resulting magnetic field. In addition, the configuration of the described dual-loop antenna increases the coverage of the antenna, and decreases inter-winding capacitance, thereby increasing overall read range achieved by the antenna.
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Citations
29 Claims
- 1. An antenna for interrogating radio frequency identification (RFID) tags having a maximum dimension M, the antenna comprising a plurality of conductive loops to produce an electromagnetic field for RFID communication with the RFID tags, wherein the conductive loops are spaced apart at least a distance D, wherein D≧
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11. A radio frequency identification (RFID) system comprising:
- an RFID tag associated with an article, wherein the RFID tag has a maximum dimension M; and
an antenna having a plurality of conductive loops to produce an electromagnetic field for communication with the RFID tag, wherein the conductive loops are spaced at least a distance D, wherein D≧
M. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
- an RFID tag associated with an article, wherein the RFID tag has a maximum dimension M; and
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19. A radio frequency identification (RFID) system comprising:
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an RFID tag associated with an article, wherein the RFID tag has a dimension M; an antenna for interrogating RFID tags having a maximum dimension M, the antenna comprising a plurality of conductive loops to produce an electromagnetic field for RFID communication with the RFID tag, wherein the antenna has a substantially planar form, and wherein the conductive loops are spaced apart at least a distance D, wherein D≧
M; anda substantially-contiguous conductive shield positioned around the antenna and within a plane parallel to the antenna. - View Dependent Claims (20, 21)
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22. A method comprising:
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determining a maximum dimension M of a radio frequency identification (RFID) tag for use within a radio frequency identification (RFID) system; selecting a distance D based on the dimension M, wherein D≧
M; andpositioning a plurality of conductive loops of an antenna such that the conductive loops are spaced apart at least the selected distance D for communication with the RFID tag within the RFID system. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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Specification