Performance of Single and Double T-matched Short Dipole Tag Antennas for UHF RFID Systems
Keywords:
Performance of Single and Double T-matched Short Dipole Tag Antennas for UHF RFID SystemsAbstract
The impact of tag antenna and chip impedance tolerances on power transfer between these components is investigated analytically. Means for efficient computation of the minimum and maximum power transmission coefficient under given impedance tolerances are developed. The presented sensitivity analysis is employed to quantify the design uncertainty of single and double T-matched short dipole tag antennas for UHF RFID systems. The simulated and measured performance of the two tag antennas is analyzed and compared.
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d
tag [m]
870 880 890 900 910 920 930 940 950 960
f [MHz]
d
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870 880 890 900 910 920 930 940 950 960
Measured
Nominal
One STD, r=s=0
One STD, r=s=5%
Fig. 8. Theoretical empty space read range of
T-Tag (top) and DT-Tag (bottom) in the
forward direction.
BJÖRNINEN, ELSHERBENI, UKKONEN: PERFORMANCE OF T-MATCHED SHORT DIPOLE TAG ANTENNAS FOR UHF RFID SYSTEMS
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