Combined radio and magnetic energy responsive surveillance...

Details Combined radio and magnetic energy responsive surveillance... Combined radio and magnetic energy responsive surveillance...

G - Physics

08

B

343/17, 340/124.

G08B 13/24 (2006.01)

Patent

CA 1187155

ABSTRACT OF THE DISCLOSURE A surveillance marker has a semiconductor connected between arms of a dipole antenna, one arm being of non-ferrous conductive material and the other of high permeability low coer- civity material such as permalloy. Higher coercivity magnetiz- able pieces are disposed adjacent the low coercivity arm, and all is sandwiched between paper or other insulating layers. The marker is detected by a combination of RF field and low frequency magnetic field generating and receiving units that energize a master alarm only when both units simultaneously detect the marker signals. Magnetizing the higher coercivity pieces suppresses a signal that would otherwise be reradiated by the marker from the high permeability arm thereby rendering the marker undetectable.

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