Abstract
UWB RF tag is an important technology for non-LOS identification of objects in harsh EM environments. Currently, there is a significant degree of activity in the UWB RF research community to develop UWB tags with robust operational characteristics, features not available with other conventional RF tags.
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Notes
- 1.
ISM is defined as Industrial, Scientific, Medical band. Radio devices are allowed to operate in ISM band without any license, provided that they are certified by the regulatory organizations for following the rules and conditions defined for this band.
- 2.
EIRP is defined as the effective isotropic radiated power which is equal to transmitted signal power from an ideal omni-directional (isotropic) antenna.
- 3.
FCC Specification per MHz bandwidth is –41.3 dBm = 500 microvolts at a distance of 3 m. The radiated power density (PEIRP) can be calculated from the following equations:
$$\frac{1}{2}\left|E\times {H}^{*}\right|=\frac{|E{|}^{2}}{2h}=\frac{{P}_{Tx}{G}_{Tx}}{4p{R}^{2}}=\frac{{p}_{EIRP}}{4p{R}^{2}}$$$$ {P}_{EIRP}=\frac{|E{|}^{2}}{377}\times 4p{R}^{2}$$Where E represents electric field, H* is the conjugate magnetic field, n is the free space impedance, P TX is the transmit power, G TX is the transmit antenna gain, and R is the distance from transmitter.
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Nekoogar, F., Dowla, F. (2011). Ultra-Wideband Technology for RF Tags: Concepts, Implementations, and Regulations. In: Ultra-Wideband Radio Frequency Identification Systems. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-9701-2_4
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DOI: https://doi.org/10.1007/978-1-4419-9701-2_4
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