I. Introduction
Radio Frequency Identification (RFID) is an electronic tagging technology which utilizes radio frequency waves to remotely detect and identify a device or an object that contains an encoded tag. The RFID system consists of two main elements RFID tag and the RFID reader. RFID tags are typically chip based and generally contain silicon chips and antennas. Today, RFID systems are being developed with tags that do not contain silicon chips termed as chipless tags.