| 摘要 |
An EAS activation/deactivation antenna in accordance with the invention comprises a core; a coil arrangement having at least two coils spirally wrapped about the core, the first coil having a first rotational direction a nd the second coil having a rotational direction counter to the first rotationa l direction; and, a current source operatively connected to the coil arrangement. In consequence of the inventive arrangement, a decaying or stea dy state, alternating or direct current supplied by a current source can excite the coil arrangement to produce a significant near magnetic field and a reduced far magnetic field, for activation or deactivation of EAS markers.
|
