| 摘要 |
PROBLEM TO BE SOLVED: To provide a radio wave transmitting device and a signal transmission system of a mobile body which transmit a video signal by communication performed by a feeble radio wave, and do not bring about a time lag. SOLUTION: This mobile body is provided with a first antenna for transmitting a video signal, and a leakage coaxial cable 3a for receiving a transmission signal from the first antenna is installed on a road surface in accordance with a traveling route for a mobile body. The first antenna comprises an antenna main body 36, wherein radiating elements 36b are arranged horizontally symmetrically with respect to a power supply part 36a and a shielding box 37 covering the antenna main body 36, wherein the radiating elements 36b formed in a plate shape and arranged horizontally in the shielding box 37 so as to face the leakage coaxial cable 36b. The shielding box 37 is a metallic box with a bottom left open, wherein an inner surface is covered with a plate made of ferrite, and the distance between the radiating elements 36b and the leakage coaxial cable 3a is 10 to 15 cm. COPYRIGHT: (C)2005,JPO&NCIPI
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