Process for fabricating resonant tag circuit constructions

A method for fabricating a plurality of individual planar resonant tags, each tag having at least one self-contained operative tuned circuit with integrally formed circuit elements including an inductor and a capacitor, the method comprising the steps of:

• providing an insulative substrate web of material of predetermined thickness and dielectric characteristics and having first and second faces and a conductive surface on said first face;
• printing on said conductive surface with an etchant-resistive material a repetitive circuit pattern defining an inductor and first and second conductive areas electrically connected to respective ends of said inductor;
• etching said conductive surface to remove unprinted portions of said conductive surface thereby to provide a repetitive circuit pattern conforming to said printed circuit pattern;
• folding said web and said repetitive circuit pattern such that the first and second conductive areas are at least in part mutually aligned to form respective plates of said capacitor;
• inserting a layer of insulative material between confronting surfaces of the folded web and circuit pattern at least in the region of said first and second conductive areas, the inserted layer forming a dielectric of the capacitor;
• sealing the folded web and circuit pattern and inserted layer at least in a region over which the first and second conductive areas are mutually aligned, thereby fixing the capacitance of the capacitor;
• and
• separating said web between adjacent said repetitive circuit patterns to provide individual planar resonant tags.

A method for fabricating a plurality of individual planar resonant tags, each tag having at least one self-contained operative tuned circuit with integrally formed circuit elements including an inductor and a capacitor, the method comprising the steps of:

• providing an insulative substrate web of material of predetermined thickness and dielectric characteristics and having first and second faces;
• providing on one of said faces a repetitive circuit pattern defining an inductor and first and second conductive areas electrically connected to respective ends of said inductor;
• folding such web and said repetitive circuit pattern such that a double layer of the insulative substrate web lies between the folded repetitive circuit pattern and such that the first and second conductive areas are at least in part mutually aligned to form respective plates of said capacitor, with said double layer of the insulative substrate web there-between forming a dielectric of said capacitor;
• sealing the double layer of the insulative substrate at least in the region over which the first and second conductive areas are mutually aligned, thereby fixing the capacitance of the capacitor;
• and
• separating said web between adjacent repetitive circuit patterns to provide individual planar resonant tags.

A method for fabricating a plurality of individual planar resonant tags, each having at least one self-contained operative tuned circuit with integrally formed circuit elements including an inductor and a capacitor, the method comprising the steps of:

• providing an insulative substrate web of material of predetermined thickness and dielectric characteristics and having first and second faces;
• providing on one of said faces a repetitive circuit pattern defining an inductor and first and second conductive areas electrically connected to respective ends of said inductor;
• providing an insulative substrate dielectric having a desired dielectric constant;
• folding said web such that one portion of said repetitive circuit pattern engages one surface of said dielectric and another portion of said repetitive circuit pattern engages another surface of said dielectric and further such that the first and second conductive areas are at least in part mutually aligned to form respective plates of said capacitor with said dielectric located therebetween;
• sealing the substrate dielectric to the circuit layer of the insulative pattern at least in a region over which the first and second conductive areas are mutually aligned, thereby fixing the capacitance of the capacitor;
• and
• separating said web between adjacent repetitive circuit patterns to provide individual planar resonant tags.

A method for fabricating a plurality of individual planar resonant tags, each tag having at least one self-contained operative tuned circuit with integrally formed circuit elements including an inductor and a capacitor, the method comprising the steps of:

• providing a layer of conductive material;
• forming a repetitive circuit pattern from said conductive material defining at least an inductor and first and second conductive areas electrically connected to respective ends of said inductor;
• folding said repetitive circuit pattern such that the first and second conductive areas are at least in part mutually aligned to form respective plates of said capacitor;
• sealing said folded circuit pattern to an insulative material such that said insulative material is positioned between said conductive areas thereby fixing the capacitance of said capacitor;
• and
• separating said conductive material and said insulative material between adjacent repetitive circuit patterns to provide individual planar resonant tags.