RFID antennas are devices used in Radio Frequency Identification systems to transmit and receive radio waves. They play a crucial role in enabling communication between RFID tags and readers. The antennas can vary in size and shape, depending on their intended application, and are designed to operate at specific frequencies. These antennas can be passive or active. Passive antennas do not have their own power source and rely on energy from the RFID reader to function, while active antennas have a built-in power source, allowing them to transmit signals over longer distances. Their design and placement significantly affect the performance of the entire RFID system.