US 9,285,470 B2 · RFID tag distance measurer

Abstract

A radio frequency identification (RFID) tag distance measuring system and method is disclosed. One example includes a first replica path that receives a signal that is simultaneously transmitted to an RFID tag. The first replica path includes a plurality of taps at known distances along the first replica path. Each of the plurality of taps has a first tap input coupled with the first replica path. In addition, an RFID signal receiver receives a return signal from the RFID tag and provides the return signal along a measurement input, wherein each of the plurality of taps have a second tap input coupled with the measurement path. A distance determiner detects at least the first of the plurality of taps to have an output and determine a distance measurement to the RFID tag based thereon.

Claims9

Dependent claims

A radio frequency identification (RFID) tag distance measurer comprising:

a replica path to receive a signal simultaneously provided, by a signal generator, to the replica path and an RFID tag, the replica path comprising:
a plurality of taps at known distances along the replica path, each of the plurality of taps have a first tap input coupled with the replica path;
an RFID signal receiver to receive a return signal from the RFID tag and provide the return signal to a measurement input, wherein each of the plurality of taps have a second tap input coupled with the measurement input;
and
a distance determiner to detect at least a first tap of the plurality of taps to have an output and determine a distance measurement to the RFID tag based thereon.

2 more elements

Dependencies are inferred from the claim text.

RFID tag distance measurer

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RFID tag distance measurer

Life of this patent

Abstract

Claims9