RADIO REPEATING APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a radio repeating apparatus ensuring easier handling of a man-hole cover, not requiring complicated processes such as drilling of holes to the man-hole cover, and also ensuring easier design and installation work.

SOLUTION: The radio repeating apparatus is installed to an underground passage just under the man-hole cover 1 in order to intermediate transmission and reception of radio signals between the underground passage and area on the ground through reflection of the radio wave propagated in the underground passage. This radio repeating apparatus 1 is characterized in including a reflector 5 for reflecting the radio waves propagated through the underground passage to a radio wave transmitting structural material 2 around the man-hole cover 1.

COPYRIGHT: (C)2009,JPO&INPIT