INSTITUT FÜR NACHRICHTENTECHNIK UND HOCHFREQUENZTECHNIK Determining the dielectric properties of a car tire for an advanced tire monitoring system Jasmin Grosinger Vienna University of Technology Institute of Communications and Radio-Frequency Engineering VTC2009-Fall 21.9.2009
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Determining the dielectric properties of a car tire for …...' = 1.5, tan(δ) = 0.003 Tread: Sidewall: Simulation model to evaluate influences of the tire on the antenna parameters
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• ATMS sensor module is mounted directly on the tire tread to measure tire properties– Pressure– Temperature– Contact area– Vertical load– Slip angle
• Radio frequency identification (RFID) functionality support lifecycle management and tire identification Source: FIT-IT project proposal, Intelligent Tire
28.08.2009 3Jasmin Grosinger
Strong interaction of antenna and tire: Investigation of tire structure and dielectric material properties of rubber
Determination of dielectric properties through the relation between the reflection coefficient and the complex permittivity by solving the electromagnetic field at the end of the probe using HFSS (high frequency structure simulator by Ansoft Corporation)
Dielectric parameters of the tire material are varied until the simulated and the measured reflection coefficients are equal for a specific frequency (curve fitting)
• To design appropriate antennas for an ATMS module in the car tire the tire structure and the electromagnetic material properties of the tire rubber have to be evaluated
• Determination of the dielectric material properties of the tire rubber is done with an open-ended coaxial probe technique
– Reflection coefficient measurement
– Numerical curve fitting in HFSS
• Design of a simulation model of the tire tread to investigate antennas directly attached to tire rubber to achieve appropriate input impedance, bandwidth, gain, and efficiency
Arrangement of the constituent molecules in the dielectric material is changed as a reaction to an external electric field (total electric field is reduced).