Abstract
A novel antenna used in the near field of a 0.92 GHz and the far field of a 2.45 GHz RFID reader system is investigated. The new antenna achieves strong magnetic field distribution over 0.92 GHz with good performance of detecting tags when applied in FCC RFID systems, as well as a good performance of circular polarization at 2.45 GHz. Furthermore, the investigation shows the operation principle by circuit models and the advantages of the structure in terms of the operation frequency and field performances. The advantages of these two bands could be achieved by this novel RFID reader antenna.
Highlights
Radio frequency identification (RFID), which was developed around World War II, is a technology that provides wireless identification and tracking capability [1, 2]
Ultrahigh frequency (UHF) near-field RFID technology received a lot of attention due to its good performances in item-level RFID applications such as sensitive products tracking, pharmaceutical logistics, transport and medical products, and biosensing applications [7,8,9,10,11,12,13]
The primary concern of UHF near-field RFID is to make the RFID system working in a short distance as reliable as that of the LF/HF near-field RFID
Summary
Radio frequency identification (RFID), which was developed around World War II, is a technology that provides wireless identification and tracking capability [1, 2]. In the 2.45 GHz band, far-field circularly polarized RFID antennas receive more attention because of the high data speed and long identification distance. Because of these interrogation characters, energy transmission speed and efficiency are very important and have been studied a lot recently [14,15,16,17,18]. One challenge in RFID applications is to design such an antenna because the operation mode and frequency differences between 2.45 GHz far field and 0.92 GHz near field are too large to operate properly for dual-band structures [4,5,6].
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