Integrated antenna system for wireless RFID tag in monitoring oil drill pipe

The paper reports a new integrated antenna system for a 5.8 GHz radio frequency identification (RFID) tag proposed for predicting the pipe's lifetime and to provide inventory control. Powering for the tag's electronics is obtained by using rectifying circuits that convert microwave energy into DC energy. The tag requires a minimal incident power density of 13.5 mW/cm/sup 2/ to establish a link and transmit 64-bit coded information to the interrogating reader.