A two-element modular antenna for near-field UHF RFID applications

Near-Field (NF) Ultra-High Frequency (UHF) Radio Frequency IDentification (RFID) systems have been developed for those applications where reader antenna and tags are in the near-field region of each other. Specifically, they keep the typical advantages of UHF RFID systems, with an improved robustness with respect to the effects of metals and liquids nearby the tag, as in the High-Frequency (HF) RFID systems.