EM Card, also called “Radio Frequency ID Card”, is a new technology emerging in recent years. Currently, commercially available ID cards are passive and use unique serial numbers that are fixed before shipment. The operational principle of EM card is such that it has circular coils connected to IC card to form a resonant circuit with an emission frequency that is the same as that of the reader. The electromagnetic wave from the reader enables the resonant circuit of ID card to generate resonance and current that acts on the ID chip. This is the operational principle of the ID card. There is no mechanical contact between the reliable non-contact ID card inside the chip and the reader, which avoids such problems that might arise from contact-type reading. In addition, the surface of non-contact ID card is free from exposed chips, so there is no possibility of such problems as chip falling, electrostatic breakdown, bending, damage, etc. This not only facilitates chip printing, but also improves the reliability of chip use.
