US Patent 11406568 Tracking system and method using injection probe

A system and method for tracking medical articles, each medical article having an RFID tag. The medical articles are located in an EM shielded container that includes an injection probe that injects RFID activation energy into the container. The injection probe comprises a main conductive element having capacitive coupling forming an electric field in the container and comprises spacing above a ground plane to form a magnetic field in the container, both fields being located in the interior of the container to activate RFID tags located therein.