Abstract: A tag and method of making it. The tag includes a first adhesive layer provided in a first predetermined pattern between a surface of a first substrate and a first conductive foil. The first pattern corresponds to a pattern for a first conductive trace, e.g., a portion of a resonant circuit. The first conductive foil is laminated, e.g., adhesively secured, to the surface of the first substrate to form a first conductive layer. A first portion of that layer is shaped, e.g., die-cut, to generally correspond to the first pattern. A second portion of the first conductive layer not corresponding to the first portion is removed, to establish the first conductive trace, with the adhesive layer confined within the boundaries of the first conductive trace. Another conductive trace is secured to the first conductive trace, with a dielectric therebetween, to form a resonant circuit.

Abstract: A method of making a resonant frequency circuit is disclosed. The method includes the steps of: (1) forming a first adhesive layer in a first predetermined pattern on a surface of a first substrate; (2) laminating a first conductive foil to the surface of the first substrate to form a first conductive layer; (3) forming a first portion of the first conductive layer in a shape generally corresponding to the first predetermined pattern; and (4) removing a second portion of the first conductive layer not corresponding to the first portion to establish a first conductive trace on the first substrate. A third conductive trace is formed on a third substrate. The third conductive trace is secured to the first conductive trace with a dielectric layer therebetween to form the resonant frequency circuit.

Abstract: A security tag for use with an electronic security system which functions within a second frequency range comprises a substantially planar dielectric substrate having first and second sides. A first conductive pattern is provided on the first side of the substrate, the first conductive pattern comprising at least a first inductive element, a first plate of a first capacitive element and a first plate of a second capacitive element. A second conductive pattern located on the second side of the substrate comprises at least a second inductive element, a second plate of the first capacitive element and a second plate of a second capacitive element with the plates of the capacitive elements being generally aligned. The inductive elements and the capacitive elements form a resonant circuit which resonates at a first frequency within a first frequency range which is outside of the second frequency range.

Abstract: The invention relates to a resonant tag including an insulating thin film and coiled circuits made of a metal foil respectively formed on both sides of the insulating thin film. The coiled circuits are formed in an electrically connected relation to each other with a space at the center of the insulating thin film. Said both coils are almost superimposed on each other to form a capacitor, thereby constituting an LC circuit. The area of a portion of each side of the thin film, said portion being surrounded by the innermost peripheries of both coils and having no metal foil on both sides, is controlled to at least 16% based on the whole area of said one side of the tag, whereby a resonant tag having an area of at most 700 mm2 can be obtained.

Abstract: The invention relates to a resonant tag including an insulating thin film and coiled circuits made of a metal foil respectively formed on both sides of the insulating thin film. The coiled circuits are formed in an electrically connected relation to each other with a space at the center of the insulating thin film. Said both coils are almost superimposed on each other to form a capacitor, thereby constituting an LC circuit. The area of a portion of each side of the thin film, said portion being surrounded by the innermost peripheries of both coils and having no metal foil on both sides, is controlled to at least 16% based on the whole area of said one side of the tag, whereby a resonant tag having an area of at most 700 mm2 can be obtained.

Abstract: A security tag used with an electronic article surveillance system for detecting the presence of the tag within a surveilled area utilizing electromagnetic energy at a frequency within a predetermined detection frequency range includes a dielectric substrate having first and second opposing principle surfaces, a peripheral outer edge, and a resonant circuit capable of resonating at a frequency within the predetermined detection frequency range. The security tag also includes a guard member, in one embodiment a discontinuous conductive member, effectively electrically isolated from the resonant circuit, extending along at least a portion of the peripheral outer edge of the substrate for surrounding at least a portion of the resonant circuit. The guard member electrically isolates the resonant circuit to facilitate testing of the resonant circuit during an early stage of the manufacturing process when the resonant circuit is in web form.