| 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. |
