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Exact image theory for the Sommerfeld half-space problem, part I: Vertical magnetic dipole

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2 Author(s)
Lindell, I.V. ; Dept. of Electrical Eng., Helsinki Univ. of Technol., Espoo Finland ; Alanen, Esko

Applying the Laplace transform, the exact distributed image current function is obtained for the classical Sommerfeld half-space problem with vertical magnetic current source. The resulting field integral is well behaved when the image current is situated in complex space. Unlike previous approximate images, the present theory is valid for any distance, height of the source, frequency, and half-space parameters. It is demonstrated that the present image theory reduces to the well-known dipole image at complex depth for large dielectric parameters of the half-space. Also, the reflection-coefficient method is obtained as a farfield approximation. Calculation of fields through exact image integration is seen to be simple and accurate and require modest computer capacity and time. In an appendix, some properties of the multivalued Green's function arising from a dipole source in complex space are also studied.

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:32 ,  Issue: 2 )

Date of Publication:

Feb 1984

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