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Cylindrical near-field far-field transformation in a half-space with conditions of dielectric and lossy ground

Published online by Cambridge University Press:  27 September 2011

Nicolas Payet ,
Muriel Darces ,
Marc Hélier ,
Jean-Louis Montmagnon  and
Florent Jangal
Nicolas Payet*
Affiliation:
UPMC Paris 06, UR 2, L2E, 4 Place Jussieu, BC 252, F-75005 Paris, France. Phone: +33 144277511.
Muriel Darces
Affiliation:
UPMC Paris 06, UR 2, L2E, 4 Place Jussieu, BC 252, F-75005 Paris, France. Phone: +33 144277511.
Marc Hélier
Affiliation:
UPMC Paris 06, UR 2, L2E, 4 Place Jussieu, BC 252, F-75005 Paris, France. Phone: +33 144277511.
Jean-Louis Montmagnon
Affiliation:
UPMC Paris 06, UR 2, L2E, 4 Place Jussieu, BC 252, F-75005 Paris, France. Phone: +33 144277511.
Florent Jangal
Affiliation:
Onera – The French Aerospace Lab, Chemin de la Hunière, F-91120 Palaiseau, France.
*
Corresponding author: N. Payet Email: nicolas.payet@upmc.fr
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Abstract

The direct measurement of the radiation pattern of an antenna is often unreachable. A near-field sampling followed by a near-field/far-field (NF/FF) transformation is therefore substituted. This process is, in most cases, applied to antennas placed in free-space or over a perfect electric conductor. On the contrary, few results concern real environment conditions. Nevertheless, it is well known that the nature of the soil can drastically change the radiating characteristic of an antenna. The lack of information about the behavior of the antenna in real conditions can give rise to substantial errors in the evaluation of the performances of electromagnetic devices. The aim of this paper is then to propose a new NF/FF transformation able to reliably supply the field radiated by an antenna placed over a plane, homogeneous, dielectric, and lossy interface. The method is based on the cylindrical-wave expansion of the electric field. The real soil is taken into account by means of its reflection coefficients. First results are given for simple antennas and for both transverse magnetic and transverse electric polarizations.

Keywords

modal expansion methodnear-field to far-field transformationlossy groundfar-field patternnear-field
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 4 , Special Issue 1: IJMWT Special Issue on the 2011 National Microwave Days in France , February 2012 , pp. 45 - 50
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2011

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References

REFERENCES

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