The homebrew RFID tags in the articles you link to are LF (125-134 kHz) RFID tag...

		RandomOpinion on Oct 27, 2018 \| parent \| context \| favorite \| on: How I made my own RFID tag [video] The homebrew RFID tags in the articles you link to are LF (125-134 kHz) RFID tags. The ones described in the video are UHF (860-960 MHz) RFID tags, which differ considerably in design and protocol.