| 摘要 |
An arrangement having a communication device (4) which has an antenna (41), wherein the antenna is designed to generate an electromagnetic field at regular intervals in a polling mode. The communication device is designed to determine at least one operating parameter of the antenna and compare the at least one determined operating parameter with a corresponding, previously determined operating parameter whenever an electromagnetic field is generated, wherein a change in the at least one operating parameter indicates the approach of an object (6) to the communication device, and to emit a signal if the comparison reveals that an operating parameter has changed. |
