Binary encoded multiple frequency rf identification tag

Details Binary encoded multiple frequency rf identification tag Binary encoded multiple frequency rf identification tag

G - Physics

08

B

G08B 13/24 (2006.01) G06K 19/067 (2006.01)

Patent

CA 2117184

2117184 9305486 PCTABS00020 A tag (10) for identifying an item to which it is attached includes an inductance (L) connected in parallel with a capacitance. The capacitance includes a plurality of individual capacitors (C1, C2, C3, C4, C5), each of a predetermined different capacitance. The individual capacitors (C1, C2, C3, C4, C5) are connected to the inductance (L) to establish a resonant circuit (20) having a predetermined resonant frequency. At least one of the capacitors (C1, C2, C4) includes a dimple (12) for shorting the capacitor when the tag (10) is exposed to electromagnetic energy at the predetermined resonant frequency. The shorted capacitor establishes a second resonant frequency which may be used to identify which capacitor (C1, C2, C4) has become shorted. A binary "1" is assigned to either the shorted capacitor (C1, C2, C4) or the non shorted capacitor (C3, C5) and a binary "0" is assigned to the capacitors which are not assigned a binary "1", the binary "1"s and "0"s combining to establish a numeric code uniquely associated with the tag (10).

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