Patent ID: 7688270
Filing Date: 2010-03-30
Classification: H01Q,H04B

Abstract:
1. A near field communication (NFC) antenna comprising: a ferrite antenna including a primary antenna coil wound on a ferrite core of the ferrite antenna; a loop coil provided on a side of the ferrite antenna in a position where the loop coil is interlinked with magnetic flux generated by the ferrite antenna; a loop coil switching unit configured to switch between a mode for forming a loop of the loop coil and a mode for disconnecting the loop; a correction coil wound on the ferrite core to correct for a resonant frequency, which varies depending on the modes for connecting and disconnecting the loop of the loop coil, the modes being set by the loop coil switching unit; and a correction coil switching unit configured to switch between a mode for connecting the correction coil and a mode for disconnecting the correction coil to operate in association with switching by the loop coil switching unit between the modes for forming and disconnecting the loop of the loop coil.