Abstract
The problem considered is a vertical electrically small wire antenna located underground, which transmits electromagnetic signals to the ground. Getting Green’s function of the vertical dipole underground was the first step to calculate this issue. A quasistatic situation was considered to make an approximation on Sommerfeld integral for easy solution. The method of moments was used to solve the current distribution on the antenna surface at different frequencies, which laid a good foundation for obtaining the electric field of the antenna. Then the axial and radial components of the electric field with the radial distance on the ground were investigated, as well as the voltage received on the ground. Furthermore, the influence of the frequency and stratum parameters on current and electric field was studied to understand the variation clearly.
Highlights
Underground antenna has wide applications in many areas such as energy, geology, and military
In 2010 Khalatpour et al [11] presented a method for evaluation of impedance and current distribution of a vertical wire antenna above lossy ground; this work was completed by using the matrix pencil method
In 2014 Pan and Li [16] introduced the solution for extremely low frequency (ELF) or super low frequency (SLF) wave propagating in different regions
Summary
Underground antenna has wide applications in many areas such as energy, geology, and military. In 2010 Zou et al [12] presented a fast algorithm for calculating the field excited by a vertical dipole over a lossy ground; the integrals in this work were decomposed into two parts, one could be calculated by a recursive analytical expression and the other can be calculated numerically. In 2014 Christakis et al [15] solved the problem of radiation from a vertical short dipole antenna above lossy ground and used the stationary phase method to obtain the field formulation with closed form analytical solution in Journal of Electrical and Computer Engineering the high frequency regime. An electrically small antenna with ELF or SLF can be the best choice for underground electromagnetic communications generator What is more, this kind of antenna can play a good role in areas such as energy development, trenchless technology, mine communication, geophysical prospecting, and lateral wells butt and monitoring of underground targets
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