Cutoff transmission and or reception antenna

摘要

An electromagnetic wave transmission and/or reception antenna ( 10 ) which includes a flat spiral wire, the spiral having at least two turns; the antenna including at least one cut ( 12 ) for the purpose of reducing the inter-turn capacitance. Such an antenna is used in a contactless communication system in which the reader transmits electromagnetic signals to a portable object (card or ticket) in order to identify the holder of the portable object when the latter transmits return identification signals to the reader.