A MARKER FOR REMOTE DETECTION OF ARTICLES

摘要

A marker (30) for remote detection of articles has an elongated sensor element (34) with magnetic and electric properties. The elongated sensor element provides an electromagnetic reply signal when receiving an electromagnetic input signal. The elongated sensor element modulates the electromagnetic reply signal in response to an external magnetic modulating field. The marker (30) also has means (40) positioned in a vicinity of the elongated sensor element (34) in the marker (30). The means is adapted to influence either the magnetic or the electric properties of the elongated sensor element (34) in response to incident electromagnetic or magnetic energy, so that either the electromagnetic reply signal itself or the modulation thereof is substantially changed from an active state to a deactivated state.