An Experimental Study of Passive UHF RFID System with Longer Communication Range

Radio-frequency identification (RFID) systems are useful for reducing costs in supply chains. The communication range between the reader and the tag is one of the most important points in the application of RFID to supply chain management. We present results of experiments conducted on our passive RFID prototype system that we designed with the aim of increasing the communication range. It uses an intermittent transmission method to reduce the power consumption of the tag IC. Our results show that the power consumption was reduced to about three-quarters by using intermittent transmission with a duty ratio of 40%. Our experimental results indicate that optimization of the transmitting signal is effective for saving power consumption at tag IC and increasing the communication range.