1. A device comprising: an RFID tag including communications circuitry and a memory; an antenna coupled via first and second antenna terminals of the RFID tag to the communications circuitry of the RFID tag for wirelessly communicating with an RFID tag reader or writer; and a processor coupled via the first and second antenna terminals to the RFID tag in parallel with the antenna, and communicating with the RFID tag through a filter connected in parallel with a detector, wherein the filter and detector are wired between the processor and the RFID tag.