Aperture antenna modelling by a finite number of elemental dipoles from truncated spherical field measurement: Experimental investigation

Mohammed Serhir (1) , Jean-Michel Geffrin (2) , Amelie Litman (2) , Nicolas Ribière-Tharaud (3) , Philippe Besnier (4)

1 DRE - Département de Recherche en Electromagnétisme ; EMG - Département Electromagnétisme - L2S
2 FRESNEL - Institut FRESNEL
3 L2S - Laboratoire des signaux et systèmes
4 IETR - Institut d'Électronique et des Technologies du numéRique

A method to determine a distribution of a finite number of elementary dipoles that reproduce the radiation behaviour of the antenna under test (AUT) from truncated spherical field measurements is proposed. It is based on the substitution of the actual antenna by a finite number of equivalent infinitesimal dipoles (electric and magnetic), distributed over the antenna aperture. This equivalent set of elementary dipoles is optimized using the transmission coefficient involving the spherical wave expansion of the measured field and using an appropriate matching method. Once the current excitation of each dipole is known, the radiated field of the antenna at different distances can be rapidly determined. The reliability and the accuracy of the method are shown using experimental data issued from the measurement of an X-band horn antenna, in two different measurement setups.

Domains: Electromagnetism

Mohammed Serhir, Jean-Michel Geffrin, Amelie Litman, Nicolas Ribière-Tharaud, Philippe Besnier. Aperture antenna modelling by a finite number of elemental dipoles from truncated spherical field measurement: Experimental investigation. Antennas and Propagation (EuCAP), 2010 Proceedings of the Fourth European Conference on, Apr 2010, Barcelona, Spain. pp.1. ⟨hal-00553802⟩