Miniaturised dual-band S-shaped RFID tag antenna mountable on metallic surface

A miniaturised dual-band S-shaped RFID tag antenna, which is mountable on a metallic surface, and which can handle UHF bands (Korea band: 908.5–914 MHz, Europe band: 865–868 MHz), is presented. The antenna was designed with a meander and spiral structure, through modifying the microstrip feeding line and ground line, and was miniaturised to a size of 20 mm (width)×33.5 mm (length)×2 mm (height). The maximum read ranges were 1.6 m (Korea band, EIRP of reader: 4 W) and 0.75 m (Europe band, EIRP of reader: 1 W), respectively.