Electromagnetic radiation characteristics of an airborne very-low-frequency (VLF) dual trailing antenna in the half-space (a space including air and seawater) were studied. The airborne VLF dual trailing antenna models in half-space were established and calculated by finite element method (FEM). The influences of the half-space to antenna radiation patterns were investigated using numerical results. In addition, through shifting feed locations (i.e., changing the ratio of long antenna and short antenna), variation trends of antenna characteristic parameters in half-space, including antenna input impedance and radiation efficiency were obtained. Good agreements of simulation results and the corresponding data announced by american naval and air development center were achieved, which validates the effectiveness and reliability of the proposed method and results. The achievements provide significance to the airborne VLF dual trailing antenna design in the future.
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