| 摘要 |
<p>An antenna system (3) for a transponder radiofrequency reading device (1) ; the antenna system (3) having a flat, annular, circular first antenna (4) connected to a first tuning circuit (6) set to 13.56 MHz frequency; an emitting/receiving system (7) for generating an alternating electric current in the first tuning circuit (6); and a flat, annular, polygonal second antenna (8), which is connected to a nonpowered second tuning circuit (9) set to 13.56 MHz frequency, is parallel to the first antenna (4), and is separated from the first antenna (4) by a distance ranging from 3 to 30 mm, so as to be coupled magnetically to the first antenna (4).</p> |
