Passive UHF RFID smart polling device

Radio Frequency Identification (RFID) is a method for automatic ID reading that allows ranging or tracking of transponders or RFID tags. Each tag carries a univocal ID code and is attached to an object or associated to a person or animal for identification and location applications, without requiring line-of-sight. RFID market is exploding with new applications pointing to massive penetration of RFID technology in industrial environment, retail stores, offices and even households for control of products, assets, documents etc. [1]. World assigned bands range from Low Frequency (LF) up to Microwaves [2]. Tags can be passive, retrieving the necessary energy from the interrogating wave or can include a battery (active tags) to enhance reading range. But the strong potential for application and market development lies on passive tags: at UHF (860 MHz to 960 MHz) its cost is the lowest, in the order of cents; it is usually thin and small as a label, and requires no maintenance.