A thin multi‐slotted dual patch UHF‐band metal‐mountable RFID tag antenna

This article presents an RFID (Radio Frequency Identification) tag antenna, which works in the 902–928 MHz band. The multi‐slotted dual patch tag antenna is designed for a 1.6‐mm‐thick substrate, and it can be mounted on metal without degradation in performance. Due to a low‐profile and simple structure, this antenna has more potential for mass production compared to earlier antenna designs. It is shown by simulations how the bandwidth can be increased by incorporating multiple slots in the radiating patch elements of the antenna. Design curves showing the effect of different tuning parameters on the tag performance are presented. The performance of the tag is evaluated both in free‐space and on metal plate and the simulated input impedance, power reflection and radiation patterns are presented. A prototype of this multi‐slotted dual patch tag antenna has been constructed and impedance measurements are performed for the proposed tag in free‐space and on metal plate. Finally, maximum readable distances for the tag are calculated.