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Near-field to far-field transformation applied to UHF antennas over lossy ground

Published online by Cambridge University Press:  27 September 2019

Nicolas Bourey ,
Muriel Darces Open the ORCID record for Muriel Darces [Opens in a new window] ,
Yves Chatelon  and
Marc Hélier
Nicolas Bourey
Affiliation:
Laboratoire d'Électronique et Électromagnétisme, Sorbonne Université, L2E, F-75005, Paris, France
Muriel Darces*
Affiliation:
Laboratoire d'Électronique et Électromagnétisme, Sorbonne Université, L2E, F-75005, Paris, France
Yves Chatelon
Affiliation:
Laboratoire d'Électronique et Électromagnétisme, Sorbonne Université, L2E, F-75005, Paris, France
Marc Hélier
Affiliation:
Laboratoire d'Électronique et Électromagnétisme, Sorbonne Université, L2E, F-75005, Paris, France
*
Author for correspondence: Muriel Darces, E-mail: muriel.darces@sorbonne-universite.fr
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Abstract

This paper deals with a near-field to far-field transformation able to predict the radiation of UHF antennas located over a lossy ground. From in-situ near-field measurements, an equivalent set of dipole sources is obtained as a model of the characterized antenna. The paper details the main steps of the transformation and describes the specific experimental set-up designed for the application. Simple directional antennas (monopoles array) as well as more complex omnidirectional antennas (like a biconical antenna as a scaled-down model of a HF antenna) have been tested in realistic environments. This approach is very efficient for separating the contributions of the radiated waves: the sky wave and the surface wave.

Keywords

Antenna designmodeling and measurementsmicrowave measurementsnear-field to far-field transformation
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 12 , Issue 3 , April 2020 , pp. 227 - 232
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2019

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