| 摘要 |
An RFID reader ( 1, 1 ') comprises a signal generator ( 2 ) for generating high frequency electrical signals (ES) and an antenna ( 3 ) to which the high frequency electrical signals (ES) are feedable in a symmetric mode. The RFID reader ( 1 ) further comprises tuning means ( 4, 4 ') for maintaining the antenna ( 3 ) in a symmetric operating mode, wherein the tuning means ( 4, 4 ') are controllable in dependency of varying coupling impedances (CG) occurring between the antenna ( 3 ) and its environment (G).
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