Analysis and Design of a Long Range PTFE Substrate UHF RFID Tag for Cargo Container Identification
Abstract In this paper, a high performances microstrip antenna for UHF (ultra high frequency) RFID (radio frequency identification) tag is designed, prototyped and tested. The antenna consists of two main components: a 1.52 mm RT/duroid 5880 laminate substrate on which the antenna is designed and a 10 mm polytetrafluoroethylene (PTFE) dielectric material placed as a separator between the antenna and the reference ground plane for the microstrip antenna. With this structure, the RFID tag can reach a maximum reading distance of 19 m, although the antenna has a compact size of 80 mm x 50 mm. The long reading distance is obtained by attaching to the antenna an RFID chip that can provide a reading sensitivity of 20.5 dBm. The high bandwidth from 677 MHz to 947 MHz measured at 10 dB, makes the tag being usable worldwide especially for cargo container identification, the main purpose of this research.