| 摘要 |
The present invention relates to an NFC antenna comprising an outer loop of two or three turns which is close to the outside of a rectangular substrate and an inner loop of one or two turns which is followed by the outer loop, is close to the long transversal sides and is formed in the location of 35-65% between the short longitudinal sides and the center axis. The NFC antenna of the present invention is able to improve a Q value and a recognition distance in the same antenna area in an antenna structure having an electromagnetic wave absorption sheet while having from at least three turns to at most five turns (when calculating the branched case) and remove a null point. Furthermore, the NFC antenna of the present invention has a smaller impedance value (L) relative to the length of the antenna while having excellent impedance matching condition, thereby realizing more effectively a magnetic field which generates induced electromotive force in a passive tag. |
