Powerless wireless keyboard system and method using passive rfid

A powerless wireless keyboard system using passive RFID(Radio Frequency IDentification) and an operation method thereof are provided to enhance the efficiency and convenience in using a wireless keyboard by realizing the powerless system based on passive RFID communication between a computer main unit and the wireless keyboard. A pressure sensor(27) generates a micro current from a small piezoelectric element not using power by using pressure pressing a key. An RFID sensor tag(26) returns a signal value preset to the key when the pressure sensor generates an electric signal. A computer main unit connector(21) converts the signal returned from the RFID sensor tag into the signal suitable for a computer keyboard interface and transmits the converted signal to a computer main unit(20). The computer main unit connector includes an RFID reader(23) using a passive RFID reader and transmitting the signal returned from the RFID sensor tag without conversion, a computer communicator(22) converting the signal received from the RFID reader into the signal suitable for the computer keyboard interface and transmitting the converted signal to the computer main unit, and a synchronizer(24) synchronizing data communicated between the RFID reader and the computer communicator.