Patent ID: 6925701
Filing Date: 2005-08-09
Classification: G06K,G08B,H01F,H01L,Y10T

Abstract:
1. A method of making a series of resonant frequency tags which each resonate at substantially the same predetermined frequency, the method comprising the steps of: (a) forming a series of first conductive patterns, the first conductive patterns all being substantially the same, each first conductive pattern comprising an inductive element and a first land, the first land having a first end connected to one end of the inductive element and a second end spaced a predetermined distance from the first end; (b) separately forming a series of second conductive patterns, the second conductive patterns all being substantially the same and each second conductive pattern comprising a second land and a link element, the second land having a predetermined width; (c) securing a second conductive pattern to a first conductive pattern of the series at a first predetermined location so that the second land overlies at least a portion of the first land with a dielectric therebetween to establish the plates of a capacitive element of a first tag of the series, the capacitive element having a first predetermined capacitance; (d) measuring the resonant frequency of the tag and comparing the measured frequency with the predetermined frequency; and (e) if the measured resonant frequency matches the predetermined frequency within a predetermined tolerance, forming the next tag of the series by securing another one of said second conductive patterns to another one of said first conductive patterns of the series by positioning the second land of said next tag over at least a portion of said first land of said next tag that corresponds to said at least one portion of said first land in said first tail, and wherein a dielectric is disposed between said first and second lands of said next tag to establish a capacitive element of said next tag, said capacitive element of said next tag having the first predetermined capacitance and then repeating steps (d) and (e) for the remainder of the series and if the measured resonant frequency does not match the predetermined frequency within the predetermined tolerance, forming the next tag of the series by securing another one of said second conductive patterns to another one of said first conductive patterns of the series by positioning the second land of said next tag over at least a portion of said first land of said next tag that does not correspond to said at least one portion of said first land in said first tag, and wherein a dielectric is disposed between said first and second lands of said next tag to establish a capacitive element of said next tag, said capacitive element of said next tag having a second predetermined capacitance and then repeating steps (d) and (e) for the remainder of the series.