Design and implementation of RFID system

This paper deals with the Radio Frequency Identification (RFID) and shows a full design for an RFID system. This system was designed as a security system for corporate and an office where a list of employees is provided in a database in the main computer and each employee is given a Tag that holds a specific identification number. The system will identify the employees as they pass nearby the Reader. A software application works as an interface application to the RFID system. The RFID system was designed using the concept of FSK modulation as a technique to transmit and receive the signal. The FSK modulator works on two discrete frequencies 14 MHz and 6 MHz. The Demodulator part of the RFID system was designed to detect the amplitude of the RF signal and then converting it to a digital signal that the microcontroller can read. The designed RFID system was able to function properly where a successful communication occurred between the Reader and the Tag.