Studies associated with the electromagnetic waves (EMWs) scattering from a dipole antenna located on/in proximity to a layered earth structures have been attracted the attention of many scientists since its early inception. These Studies have been used in many useful engineering applications like: radio communication, underwater communication, mine communication, remote sensing, and geophysics exploring. The features of interaction of electromagnetic fields with magnetic-field-aligned plasma density irregularities have been the subject of numerous studies, and there exists a vast literature on various aspects of radiation, propagation, and scattering of waves in the presence of such plasma structures in space and the laboratory. In spite of this variety of studies from scientists, beginning with Sommerfeld a century ago to date, full wave expressions for the generated fields still are not available. That is because of the most published papers presented closed form approximations for the fields, which are accurate subject to assumptions that limit their applicability to highly conducting material media or prescribed frequency ranges. The assessment of the electromagnetic fields (EMFs) contains Sommerfeld integrals (SIs), which might be hard to evaluate, and to reduce them to amenable integrals many techniques have been used such as asymptotic methods, contour integration, saddle-point method, branch cuts inception and other different approaches.
Author(s) Details:
Sh. Shoeib
Department of Mathematics, Faculty of Science, Ain Shams University, Cairo, Egypt and El-Gazeera Higher Institute for Engineering and Technology, Egypt.
Recent Global Research Developments in Challenges and Advances in Electromagnetic Wave Scattering from Dipole Antennas Near Layered Earth Structures
Fast and Accurate Solution for the Surface Fields Scattering of a Dipole Antenna Placed on Planar Multi-Layered Earth
In this research, Shoeib [1] presents an efficient solution for the EM scattering problem arising from a dipole antenna positioned on a planar multi-layered earth. The study addresses the challenges associated with modeling and analyzing such scenarios.
Here are the key points from the research:
Derivation Approach:
- The derivation involves three steps:
- Field Integral Reduction: The field integrals are reduced to combinations of recognized Sommerfeld integrals (SIs) expressed as an infinite series.
- Complex Plane Transformation: In the complex plane, the reflection coefficient is replaced using an exponential function that approximates the summation of algebraic series.
- Shoeib Technique: The integrand is divided into two factors, allowing the calculation of the stationary phase point. Closed-form expressions for the far-field are derived efficiently.
Practical Applications:
- The obtained results can be used to evaluate numerical solutions of more complicated modeling algorithms.
- Applications include remote sensing, radar signal processing, and understanding EM scattering near layered earth structures.
Advantages:
- The proposed method is valid irrespective of the operating frequency.
- It outperforms previous solutions in terms of computational speed.
- Numerical simulations confirm the validity of this advanced approach.
References
- Shoeib, H. S. (2021). Fast and accurate solution for the surface fields scattering of a dipole antenna placed on planar multi-layered earth. Radio Science, 56(7), 1-7.
- Ptasinska, S., Varella, M.T.d., Khakoo, M.A. et al. Electron scattering processes: fundamentals, challenges, advances, and opportunities. Eur. Phys. J. D 76, 179 (2022). https://doi.org/10.1140/epjd/s10053-022-00482-8
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