Abstract
This work is about a horizontal electrically small wire antenna located underground, which transmits electromagnetic signals to the ground. To solve this problem, the expressions of the magnetic vector potential and the electric field are derived. Further, a quasi-static situation is considered in the condition of extremely low frequency (ELF) or super low frequency (SLF) to make an approximation on Sommerfeld integral for easy calculation. The method of moments (MOM) is used to solve the current distribution along the antenna surface at different frequencies, which lays a good foundation for obtaining the electric field of the antenna. Then the three components of the electric field along the radial distance at different polar angles on the ground are investigated, as well as the voltage received on the ground. Furthermore, some influence factors of the antenna are analyzed in order to know the operating characteristics of the antenna better. The results indicate that the antenna length and relative permittivity have a positive correlation with the radial component of the electric field magnitude, while the buried depth, frequency, and conductivity have a negative correlation with that. The influence of these factors on electric field is obvious except the relative permittivity.
Highlights
Electromagnetic underground communication plays an important role in the mine production
Sommerfeld [2] established a vertical dipole model placed at the surface of ground and used the evaluation of FourierBessel integrals to solve it
Xu and Huang [13] used an efficient computation to solve the problem of an electric dipole above a lossy half space in 2007
Summary
Electromagnetic underground communication plays an important role in the mine production. Moore and Blair [3] gave the field expressions of a dipole near a conducting half space in 1961. King [8] did the study about a dipole over an imperfectly conducting half space as early as 1990. In 1997, King et al [9] studied a very low frequency antenna in the sea and gave the results of electromagnetic fields. Xu and Huang [13] used an efficient computation to solve the problem of an electric dipole above a lossy half space in 2007. Parise [15] did a research on quasistatic theory and obtained the harmonic electromagnetic field components excited by a vertical electric dipole lying on the surface of a flat and homogeneous lossy half space in 2013.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
