Modeling finite electric dipoles over an inhomogeneous earth

Evert C. Slob

doi:10.1117/12.383579

27 April 2000 Modeling finite electric dipoles over an inhomogeneous earth

Evert C. Slob

Proceedings Volume 4084, Eighth International Conference on Ground Penetrating Radar; (2000) https://doi.org/10.1117/12.383579
Event: 8th International Conference on Ground Penetrating Radar, 2000, Gold Coast, Australia

Abstract

Numerical modeling of more or less realistic antennas is interesting to people working on antenna design and to people working on the processing and interpretation of radar data. They have different demands regarding the output of the model code. Our interest lies with improving scalar imaging algorithms using the coupling effects of a bi-static GPR acquisition configuration where the antennas are both close to the earth surface. They can be in each other's broadside, endfire or cross-polarization plane. We have implemented the theory for the electromagnetic radiation and scattering problem for GPR applications for straight wire antennas. The receiver antenna is identical to the source except for the excitation mechanism. The antennas are not modeled as perfect conductors but have a finite resistance distribution. To study the coupling effects between two antennas, a Neumann expansion of the integral equation for the excited currents in the antennas results in an iterative computation of the currents where each term in the expansion exactly accounts for one order of multiple scattering between the antennas. The coupling with the earth can be accounted for in the same way but can also easily included directly in the formulation.

Citation Download Citation

Evert C. Slob "Modeling finite electric dipoles over an inhomogeneous earth", Proc. SPIE 4084, Eighth International Conference on Ground Penetrating Radar, (27 April 2000); https://doi.org/10.1117/12.383579

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