| 摘要 |
PCT No. PCT/NL91/00074 Sec. 371 Date Nov. 30, 1992 Sec. 102(e) Date Nov. 30, 1992 PCT Filed May 1, 1991 PCT Pub. No. WO91/17533 PCT Pub. Date Nov. 14, 1991.An electromagnetic shoplifting detection system of the type operating with a high-frequency detection field, including at least one antenna coil (6, 7) mounted adjacent to or on a checkout unit (K1, K2) for generating an electromagnetic alternating field by which detection labels having a resonant circuit can be detected, the checkout unit containing electrically conducting elements (11) in which elements in operation parasitic currents are produced due to the alternating field, and which conducting elements form a parasitic signal path, and devices (20, 30) arranged between the at least one antenna and the checkout unit for providing an electromagnetic shield between the at least one antenna coil and checkout unit.
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