The description of LF/HF Contactless Smart Card Reader.
High frequency card reader is a card reader that works in the high frequency HF band. It generally works in the 13.56M frequency band. Sensors at this frequency no longer need coils to be wound, and antennas can be made by etching them alive and printing them. Inductor usually works by load modulation, that is, the voltage on the antenna of reader is changed by the switch on and off of the load resistor on the inductor, so as to realize the amplitude modulation of the antenna voltage by the remote inductor. If a person controls the load voltage on and off with the data, the data can be transmitted from the sensor to the reader.