RADIO FREQUENCY DETECTABLE DEVICE

摘要

A radio frequency detectable device comprising two electrically connected metallic cavity regions, the cavity regions in combination having an associated distributed inductance and distributed capacitance, wherein a first one of the cavity regions is defined between a pair of plates of relatively large plate separation and is loaded with a ferrite material, the first cavity region having a relatively large distributed inductance, and wherein a second one of the cavity regions is of relatively small plate separation and is filled with a dielectric, the second cavity region having a relatively large distributed capacitance. The second cavity region may be wound around the first cavity region to form a circuit with resonant frequency corresponding with an operating frequency of a reader.