The RFrelated design of proximity control device (PCD) was consided.Based on the working mode of inductively coupled passive RF systems and detailed theoretical description of electromagnetic field (EMF),an algorithm was created for calculating magnetic flux density and antenna terminal voltage of nearfield PCD and integrated circuit (IC) card.The IC card being used is in accordance with ISO 14443 standard and together with 2.4 GHz antenna module provided by the ZTEIC,the need for subway AFC system’s turnstiles can be fulfilled by providing the authority with dualmode radio frequency PCD.