Metalized dielectric substrates for EAS tags

A resonant tag circuit for use as an electronic article surveillance tag, comprising:

• a flexible substantially planar inorganic dielectric substrate having a thickness of less than 5000 Å and a first side and a second side;
• a conductive layer applied to said first side of said dielectric substrate wherein said conductive layer is at least 10 microns thick and a conductive layer applied to said second side of said dielectric substrate;
• a first conductive pattern positioned on said first side of said dielectric substrate wherein said conductive pattern comprises an inductor and a capacitor plate;
• a second conductive pattern positioned on said second side of said dielectric substrate wherein said conductive pattern comprises a capacitor plate in registration with said capacitor plate on said first side of said dielectric substrate;
• a conductive element connecting said second conductive pattern to said first conductive pattern to form a series inductor-capacitor resonant circuit.

A metalized dielectric substrate comprising:

• a flexible substantially planar polymeric dielectric substrate having a thickness of less than 15 microns and a first side and a second side;
• a first conductive layer on said first side of said dielectric substrate wherein said first conductive layer is at least 10 microns thick;
• and
• a second conductive layer on said second side of said dielectric substrate.

A resonant tag circuit for use as an electronic article surveillance tag, comprising:

• a flexible substantially planar polymeric dielectric substrate having a thickness of less than 15 microns and a first side and a second side;
• a conductive layer applied to said first side of said dielectric substrate wherein said conductive layer is at least 10 microns thick and a conductive layer applied to said second side of said dielectric substrate;
• a first conductive pattern positioned on said first side of said dielectric substrate wherein said conductive pattern comprises an inductor and a capacitor plate;
• a second conductive pattern positioned on said second side of said dielectric substrate wherein said conductive pattern comprises a capacitor plate in registration with said capacitor plate on said first side of said dielectric substrate;
• a conductive element connecting said second conductive pattern to said first conductive pattern to form a series inductor-capacitor resonant circuit.