Abstract: A circuit-like metallic foil sheet for resonant tags and the like, and a process for fabricating the same. The circuit-like metallic foil sheet is fabricated by a process comprising: fabricating a laminate by adhering, to a carrier sheet such as a paper or a plastic film, a metallic foil whose surface is coated with hot-melt adhesive resin film, using an adhesive whose adhesion force decreases by heating; stamping out the metallic foil of the laminate to provide thereto a predtermined circuit-like pattern using a stamping die; superposing the metallic foil side of the laminate on a support such as a plastic film: and trasnferring the circuit-like metallic foil to the surface of the support by heating the circuit-like pattern from the support side or the carrier sheet side.A circuit board comprising a resonant circuit or a printed wiring circuit can be obtained with high precision without employing an etching process in which chemicals are used.

Abstract: A resonant frequency characteristic tag has a thin dielectric film made of a polymer such as polyethylene, and a pair of resonant frequency characteristic circuits each formed on each side of the thin dielectric film, made of a metal foil and having a particular resonant frequency, the two resonant frequency characteristic circuits have terminal sections short-circuited to one another. A release paper is applied by a pressure sensitive adhesive to the surface of one of the two resonant frequency characteristic circuits, and a through hole or opening(s) with a diameter in a range between 0.5 and 3 mm is formed at an electrode plate in a capacitor section of the circuit. The distance between the two electrode plates is adjusted to a predetermined dimension by heating and pressing a portion at the periphery of the through hole or opening(s) with a suitable tool.

Abstract: A resonant frequency characteristic tag is disclosed, which comprises an electrically insulating thin film having an electric characteristic, an electric circuit consisting of a metal foil formed on one side surface of the thin film and having a predetermined length and having opposite end portions respectively formed with a capacitor section and a terminal section, the capacitor section having a piercedly formed hole extending from the side of the metal foil to the other side surface of the thin film, the metal foil being deformed in the formation of the hole into a burr-like portion extending toward the other side surface of the thin film, and an electrode metal foil formed on the other side surface of the thin film and having a size capable of containing the hole, the electrode metal foil being laminated to the other side surface of the thin film with an electrically insulating adhesive having a dielectric characteristic such that the free end of the burr-like portion and the electrode metal foil is spaced