Electronic article surveillance tag product and method of manufa

Details Electronic article surveillance tag product and method of manufa Electronic article surveillance tag product and method of manufa

1996-05-01

1998-07-14

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

34082554, 343895, 29832, 29854, G08B 1314

Patent

active

057811105

ABSTRACT:
An RF EAS tag includes a substrate with a conductive element positioned on a face surface thereof and having electrically inductive properties. A capacitive element is positioned on the face surface and has electrically capacitive properties wherein the inductive and capacitive elements are operably coupled together to form a resonant circuit which resonates when an electrical signal of a predetermined resonant frequency is applied to the tag. The capacitive element comprises a dielectric ink substance having a high dielectric constant for producing the desired resonant circuit on a single face surface of the substrate. An alternative tag comprises a substrate with a conductive layer positioned thereon and a gap formed in the conductive layer exposing a portion of the substrate. This forms a slotline waveguide shorted at both ends. A high dielectric constant ink substance is then deposited in the slot. This greatly reduces the wavelength in the waveguide allowing an RF frequency 1/2 wavelength resonant line to be made of a practical length.

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