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2. Radio-frequency identification - Wikipedia

   en.wikipedia.org/wiki/Radio-frequency_identification

   A radio-frequency identification system uses tags, or labels attached to the objects to be identified. Two-way radio transmitter-receivers called interrogators or readers send a signal to the tag and read its response. [16]

3. Wireless identification and sensing platform - Wikipedia

   en.wikipedia.org/wiki/Wireless_Identification...

   A wireless identification and sensing platform (WISP) is an RFID (radio-frequency identification) device that supports sensing and computing: a microcontroller powered by radio-frequency energy. [1] That is, like a passive RFID tag, WISP is powered and read by a standard off-the-shelf RFID reader, harvesting the power it uses from the reader's ...

4. Encoder receiver transmitter - Wikipedia

   en.wikipedia.org/wiki/Encoder_receiver_transmitter

   Encoder receiver transmitter (ERT) is a packet radio protocol developed by Itron for automatic meter reading. [1] The technology is used to transmit data from utility meters over a short range so a utility vehicle can collect meter data without a worker physically inspecting each meter.

5. Chipless RFID - Wikipedia

   en.wikipedia.org/wiki/Chipless_RFID

   Like various existing RFID technologies, chipless RFID tags are associated with a specific RF reader, which questions the tag and recovers the information contained in it. The operating principle of the reader is based on the emission of a specific electromagnetic (EM) signal toward the tag, and the capture of the signal reflected by the tag.

6. Proximity card - Wikipedia

   en.wikipedia.org/wiki/Proximity_card

   The reader has its own antenna, which continuously transmits a short range radio frequency field. When the card is placed within range of the reader, the antenna coil and capacitor, which form a tuned circuit, absorb and store energy from the field, resonating at the frequency emitted by the reader.

7. Automatic equipment identification - Wikipedia

   en.wikipedia.org/wiki/Automatic_equipment...

   RFID antenna used by trackside AEI readers. As of 31 December 1994, Amtech had shipped over 3.1 million tags to railways in North America. The AAR reported that over 95% of the North American rail car fleet was tagged. Over 3,000 readers have been installed by the railways in North America as of the end of 2000. Amtech was bought by TransCore.