Apparatus and method for detecting a foreign object mounted in the near range of an input means used for identification and/or authentication, input means and service machine
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United States of America Patent
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Feb 23, 2016
Grant Date -
Aug 29, 2013
app pub date -
Oct 17, 2011
filing date -
Nov 4, 2010
priority date (Note) -
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Abstract
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.
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