| 摘要 |
PROBLEM TO BE SOLVED: To make an antenna high sensitive for a long period of time without interfering to mechanical arrangement with a peripheral part. SOLUTION: When the tire T is rotated, a receiving antenna RA of a receiving part RU shortens an arrival distance of an electro-magnetic wave by positioning at an inner diameter side of a rotation track of a transmission part TU, reduces the variation and easily maintains the stable receiving sensitivity state. Further, since a wire such as a lead wire of predetermined length integrated in a wire harness connected to the receiving par RU is made to the receiving antenna RA, the receiving antenna RA is easily made toλ/4 of wavelengthλof the used electro-magnetic wave and length of integer times thereof or 5/8λ, and the receiving sensitivity is made good. COPYRIGHT: (C)2006,JPO&NCIPI |
