Method of frequency pre-tuning of EAS and RFID labels for curved surfaces
AssigneeBong Jim Im
InventorBong Jin Im
Life of this patent
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Abstract
A method of compensating for curvature effects to resonant frequency on pre-tuned planar-shaped EAS and RFID labels to apply to curve surfaces of Items. The method comprises obtaining width measurements of planar-shaped labels and radius measurements of Objects having curved external surfaces to which to apply the labels, and determines a subtending angle of a labels when applied to a curved external surface of an objects based on a quotient result of dividing the width measurement of a label along a perimeter of a curved external surface of the object and the radius measurement of the object.
Claims9
A method of frequency pre-tuning of electronic article surveillance (EAS) and radio frequency identification (RFID) labels for curved surfaces, said method comprising:
- obtaining a width measurement of a planar-shaped label;
- obtaining a radius measurement of an object having a curved external surface to which to apply the label;
- determining a subtending angle of the label when applied to the curved external surface of the object based on a quotient result of dividing the width measurer of the label along a perimeter of the curved external surface of the object and the radius measurement of the object;
- using the subtending angle to determine a change in resonant frequency caused by, surface curvature of the object;
- and
- estimating an upward shift in resonant frequency needed to pre-tune resonant frequency of the label in its planar shape so that the resonant frequency of the label when applied to the curved external surface of the Object is tuned to a target frequency of a system in which he label operates.
Dependencies are inferred from the claim text.