FEASIBILITY STUDY OF COUPLED LEAKY WAVEGUIDE SYSTEM FOR COMMUNICATION IN HIGH SPEED GROUND TRANSPORTATION

The use of a coupled leaky waveguide system for high speed ground transportation communication was studied and found to be feasible. The coupled leaky waveguide system has leaky circular waveguides along the track and a coupling antenna on the trains. Basic properties of the leaky circular waveguides were determined theoretically. The coupling was estimated based on earlier experiments. The FDM-FM system was shown to be applicable to the modulation and multiplex requirement of the system. Basic structure and signal level diagrams were presented for the proposed coupled leaky waveguide system. The unwanted radiation levels were estimated in comparison with the FCC restrictions. The interference on this system was also estimated. (Author)