NEAR FIELDS AND ANTIPODAL FIELDS IN THE TERRESTRIAL EARTH-TO-IONOSPHERE WAVE GUIDE.
SYLVANIA ELECTRONIC SYSTEMS-EAST WALTHAM MASS APPLIED RESEARCH LAB
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Near fields of a vertical electric dipole are expressed as a series of zonal harmonics or as a summation of wave-guide modes. These representations are compared with dipole fields on a conducting ground plane and with field calculations using the method of images or ray theory. The series of zonal harmonics and the mode sum provide nearly identical near fields their difference characterizes the contribution of so-called branch-cut waves and is negligible in the present computational model. In the near field range, the method of images gives the simplest field representation for ELF for VLF, a useful approximation is provided by combining the ground wave and a single sky wave. At the upper wave-guide boundary, the radial electric fields are finite but the other field components vanish when approaching the source axis. The field components exhibit similar variations also when approaching the antipode of the source. Author
- Radiofrequency Wave Propagation