| 摘要 |
The apparatus for detecting a foreign object mounted in the near range of an input means used for identification and/or authentication includes at least a coupler. The coupler is arranged to supply an oscillating signal to two input terminals of an antenna for generating a standing wave, to supply the oscillating signal with a predetermined level to a detection device, and to couple out, for the detection device, a reflection signal received by the antenna. Furthermore, the coupler is arranged to detect a phase difference between the supplied oscillating signal with the predetermined level and the reflection signal that is coupled out, in order to detect the foreign object.
|
