Summary
International Symposium on Antennas and Propagation
2009
Session Number:3E2
Session:
Number:3E2-1
Simulations of Radiation from an Antenna contained in a Tire equipped with Carcass
Takashi Teranishi, Nguyen Quoc Dinh, Naobumi Michishita, Yoshihide Yamada, Koji Nakatani,
pp.1079-1082
Publication Date:2009/10/21
Online ISSN:2188-5079
Summary:
In order to ensure driving safety, tire pressure monitoring systems (TPMS) have been introduced in the US and Europe. In Japan, the AIRwatch system has been developed [1] by The Yokohama Rubber Co.,Ltd.. In the AIRwatch system, a very small antenna for the tire pressure sensors was required at the frequency of 315MHz. The antenna gain needed to be high for saving the battery power. Hence, a small normal mode helical antenna (NMHA) was developed [2]. On the other hand, car tires have a variety of configurations. As the electrically severest case, tires with carcass are considered. In this paper, effects of carcass on radiation characteristics of the NMHA contained in a tire are studied. Radiation patterns of the NMHA are compared to that of a tire-mounted antenna. Moreover, electric field distributions around a tire are calculated. Mechanisms of producing radiation from the carcass tire are clarified.