A design of uhf RFID reader antenna with air gap / Norazlin Mohamad Razali

Ultra high frequency (UHF) radio frequency identification (RFID) is a rapidly growing technology for automated identification of objects wirelessly. Globally, each country has its own frequency allocation for UHF RFID applications and generally the UHF RFID frequency ranges from 840.5 to 955 MHz [1]. The UHF banded RFID tag can be read longer and faster than the low frequency (LF) and high frequency (HF) banded tags. The reason is because the intensity of magnetic field in HF can be well defined for a specific read zone but it quickly downs as the function of distances from the antenna [2]. Hence, the networked RFID and other RFID technologies had been focused on the UHF band.