Tuning assemblies for RFID chips

A tuning assembly for an RFID chip includes an input port, a control unit, and a plurality of capacitors connected in parallel between the input port and the control unit. A selector circuit is coupled to each capacitor and to the control unit and is configured to selectively allow and prevent current flow through any of the capacitors in response to commands from the control unit, thereby adjusting the capacitance of the RFID chip. The commands include a command to always allow current flow through a capacitor, another command to always prevent current flow through a capacitor, and a third command to selectively allow and prevent current flow through a capacitor (e.g., for automatic adjustment of the capacitance of the RFID chip). The control unit may be programmed before or after the RFID chip is coupled to an antenna, including after a fully assembled RFID label has been attached to an article.