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Considering whether a portable key device is located inside or outside a barrier

  • US 10,192,372 B2
  • Filed: 03/21/2016
  • Issued: 01/29/2019
  • Est. Priority Date: 03/23/2015
  • Status: Active Grant
First Claim
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1. A method for considering whether a portable key device is located inside or outside a barrier, the method being performed in an access control device and comprising the steps of:

  • measuring a first signal strength of a radio signal from the portable key device using a first antenna, the first antenna being directed towards the outside of the barrier and the first antenna generating a first main antenna lobe;

    measuring a second signal strength of the radio signal from the portable key device using a second antenna, the second antenna being directed towards the inside of the barrier and the second antenna generating a second main antenna lobe, wherein the second main antenna lobe generated by the second antenna is wider than the first main antenna lobe generated by the first antenna, and a gain towards the outside of the barrier by the second antenna is greater than a gain towards the inside of the barrier by the first antenna, and the signal strength from the portable key device using the second antenna is greater than using the first antenna at all positions of the portable key device on the inside of the barrier; and

    considering the portable key device to be located on the outside of the barrier only when the first signal strength is greater than the second signal strength.

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