A Compact UHF RFID Tag Antenna for Anti-Metal Used on Both Sides

Abstract

A compact UHF RFID tag antenna for tagging metallic objects is designed. The proposed antenna consists of three metallic patches and two foam substrates. A loop structure and a tuning patch is added on the middle patch for impedance matching. It can work when each side of the tag touches the metal. The antenna has a dimension of 52mm × 13mm × 2mm and has a S11< -10dB bandwidth of 880 ~ 930MHz. The maximum read distance is 9.3m. It can be well used in both metal and nonmetal environments.