| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To easily enhance a reception level of a reader on the ground to receive a radio wave transmitted from a wireless tag in a manhole. <P>SOLUTION: A radio wave reflecting member 515 is installed across a whole surface of a floor 510 of a manhole 500 so as to reflect a radio wave. The radio wave reflecting member 515 is made of metal mesh material or reflective coating material, etc. The metal mesh material is made of meshes each of which has a length shorter than that of the radio wave, is foldable so as to be carried into the manhole 500 before installation without causing any inconvenience, and can be spread over the floor 510 of the manhole 500 at the time of installation. The radio wave of the wireless tag 100 mounted in the manhole 500 is reflected on the floor 510 where the radio wave reflecting member 515 is installed, and is transmitted along with a direct wave to a reader 200 on the ground (road). <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
