| 摘要 |
The invention relates to a transponder label comprising an antenna coil ( 1 ), a semiconductor chip ( 2 ), in addition to a single layer film ( 3 ), which acts both as a carrier film and as a shield against the induction of counter magnetic fields in the metallic base layer ( 6 ). The semiconductor chip ( 2 ) acts both as a capacitor element of the transponder resonant circuit and as a memory component. The film ( 3 ) consists of a flexible matrix comprising embedded ferrite particles (4), which give the film ( 3 ) soft magnetic characteristics. The permeability value of the film ( 3 ) is adapted to its thickness D and the material of the base layer ( 6 ), said value being higher for a reduced thickness D. The resonant frequency of the transponder resonant circuit consisting of the antenna coil ( 1 ) and semiconductor chip ( 2 ) lies within a narrow target frequency range, once the label has adhered. In order to maintain said criterion for a reduced film thickness, the transponder resonant circuit is detuned to lower frequencies prior to being attached to the base layer ( 6 ), in such a way that its resonant frequency without the film (3) is significantly lower than the read out frequency.
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