Toda Kogyo Corporation

Satoshi Ohmae

Tetsuya Kimura

Yoshiro Sato

Jun Koujima

Yoji Okano

Makoto Sadai

A ferrite sheet strip includes a strip shaped substrate and a plurality of ferrite sheet pieces provided on a surface of the substrate. The plurality of ferrite sheet pieces are aligned and spaced apart by a gap from one another along a longitudinal direction of the substrate. The gap extends at least partially so as not to be parallel to a lateral direction of the substrate.

Ferrite sheet strip, and antenna device and cable using ferrite sheet strip

The present invention relates to an RF tag comprising a magnetic antenna for transmitting and receiving information using an electromagnetic induction method, and an IC mounted to the magnetic antenna, wherein the magnetic antenna comprises a magnetic core and a plurality of coils formed on the magnetic core; the coils each have an inductance Lsatisfying the specific relational formula, and are connected in parallel to each other in an electric circuit and disposed in series on the magnetic core; and a combined inductance Lof the magnetic antenna satisfies the specific relational formula. The RF tag of the present invention is used as a magnetic antenna for information communication using a magnetic field component which is capable of satisfying both reduction in size and improvement in communication sensitivity.

Magnetic antenna, and RF tag and board mounted with the RF tag

The present invention relates to a magnetic antenna for information communication using a magnetic field component which is a magnetic antenna or an RF tag capable of satisfying both reduction in size and improvement in communication sensitivity. More specifically, the present invention relates to an RF tag comprising a magnetic antenna for transmitting and receiving information using an electromagnetic induction method, and an IC mounted to the magnetic antenna, said magnetic antenna comprising a magnetic core and a plurality of coils formed on the magnetic core in which the coils each have an inductance Lsatisfying the specific relational formula, and are formed with bank winding when the coils are lap-wound so as to prevent increase in parasitic capacitance thereof, connected in parallel to each other in an electric circuit, and disposed in series on the magnetic core; and a combined inductance Lof the magnetic antenna satisfies the specific relational formula.

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Hiroshima-ken, Japan

Satoshi Ohmae