| 摘要 |
<P>PROBLEM TO BE SOLVED: To realize a telecommunication operation which performs telecommunication service for a middle distance by utilizing magnetic wave signals which are propagated at a relatively low loss, in the air, underground, underwater, in the sea, on the ground, on the water, on the sea, otherwise in a combination of them. <P>SOLUTION: A short loop antenna 222 of 1/4 wavelength of the magnetic force wave signal or less is connected to a transceiver 221 installed in a base station 22 fixed on the ground, for efficient transmission/reception of magnetic force wave signals underwater or in the sea. Further, a short loop antenna 212 of 1/4 wavelength of the magnetic force wave signal or less is connected to a transceiver 211 installed in a mobile station 21 which moves on the sea, for efficient transmission/reception of the magnetic force wave signals with the base station 22 or with an active tag 31 provided separately. Consequently a mobile communication service for middle distance is provided between a stational station 22 and the mobile station 21, or between the mobile station 21 and the active tag 31. <P>COPYRIGHT: (C)2013,JPO&INPIT |
