Electromagnetic Simulations of Undersea Propagations for Various Sea Depth at 100 MHz

Applications of radio waves for underwater communication are currently growing. Utilization of the lateral wave is considered promising. In this paper, electromagnetic simulation data are obtained in different seadepth at 100 MHz. Normal-mode helical antenna is employed for transmit antennas. The seadepth are changed from the seasurface to 50 cm depth. Visual 2D electric field distributions of the seasurface antenna indicate the lateral wave propagation situation. At 20 cm and 50 cm depth, the propagation attenuation becomes the same as the theoretical value based on the sea conductivity.