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|Title:||Far-Field tag antenna design methodology|
|Citation:||RFID Handbook: Applications, Technology, Security, and Privacy, 2008 / Ahson, S., Ilyas, M. (ed./s), pp.65-92|
|Damith C. Ranasinghe and Peter H. Cole|
|Abstract:||Antennas used in the HF region operate at 13.56 MHz whose frequency has an electromagnetic wavelength of around 22 m giving a near-field far-field boundary of around 3.5 m. Thus, given reading distance requirements of <3 m and using the regulated radiation power at the HF ISM band, reader antennas are almost always near-field creation structures that aim to create large energy density fields with the minimum amount of radiation. However, at UHF frequencies the scenario is different. At UHF frequencies, the near-field far-field boundary is around 50 mm. Thus the region of operation in the UHF spectrum is almost always in the far field, and therefore reader antenna designs are far-field creation structures that aim to operate at the highest possible efficiency. This chapter considers RFID label antennas for both near-field operation in the HF region and far-field operation in the UHF frequency range. To aid in the development of UHF tag antennas, the chapter contains material on the formulation of antenna equivalent circuits and presents an RFID label antenna design methodology, illustrated in the far field with the design of long-range, bow-tie antennas for tagging cases and pallets.|
|Appears in Collections:||Aurora harvest 5|
Electrical and Electronic Engineering publications
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