MINIATURE TRANSPONDER AND IDENTIFICATION SYSTEM COMPRISING SUCH A TRANSPONDER AND AN ADAPTIVE READER.

摘要

The transponder comprises a coil of conductive wire wound on a rod (1) of generally cylindrical ferrite shape and connected to an integrated circuit (3) identification by radio frequency waves. The winding (2) is made in a single layer of turns and the integrated circuit (3) is arranged to operate at a frequency greater than 1 MHz and is fixed directly on the ferrite bar (1), for example on a flat part. (11) formed at one end of the bar, so as not to exceed the cylindrical volume determined by the bar and the winding. The reader comprises a transmitting antenna (5) formed of a planar winding and a receiving antenna (6) comprising at least two sets (61, 62) of wire arranged in plane spirals, each set comprising two spirals (61a, 61b) planes wound in opposite directions.Application to radio wave identification systems.