Summary
International Symposium on Antennas and Propagation
2006
Session Number:1C2a
Session:
Number:1C2a-4
Electrical field simulations around a car in the AIRwatch system
Kouichi Tanoshita, Eiji Hirose, Yoshihide Yamada,
pp.1-4
Publication Date:2006/11/2
Online ISSN:2188-5079
Summary:
In order to support the vehicular safety drive, TPMS are introduced in U.S.A and Europe. In Japan, the AIRwatch system is developed. This paper clarifies electrical field environments of this system through electromagnetic simulations. First of all, electrical wave emissions from an antenna contained in a tire become larger than that of an antenna in free space. Next, electrical field distributions on a front window where a received antenna is placed are simulated. Electrical field intensities agree well with that estimated by the Friis transmission formula. So, accuracies of calculation results are ensured. Electrical field changes owing to tire rotations are also clarified. Deviations of intensities during tire rotations are about 10dB. It is concluded that sufficient electrical field strengths are achieved on a front window.