Abstract-In this paper, the feasibility of directive wavefronts generation inside a time-reversal electromagnetic chamber (TREC) is investigated in order to propose the TREC system as an alternative EMC test facility. This may be accomplished by applying the time reversal technique on electromagnetic waves inside a reverberation chamber. We evaluate the performance of the TREC in creating directive radiation patterns towards an equipment-under-test (EUT). This evaluation is based on the directivity comparison of a wavefront generated by the TREC, and the one generated by a theoretical model of an antenna array in free space. Numerical simulations of the TREC are in a good agreement with the theoretical array model, showing a root-mean-square (rms) deviation from the mean value of the E-field, over a 3 dB main lobe angle, below 6 %.
The first experimental demonstration of coherent directive and polarised wave-front generation within a reverberation chamber is presented. This feature is possible with the use of a time reversal electromagnetic chamber, a concept previously introduced by the present authors which mainly relies on the use of time-reversal techniques in a highly reverberating medium. The rationale for developing such a system is to provide the control of a field distribution in time and space without any mechanical movement of either sources or an equipment under test while preserving the high-intensity field levels achieved with reverberation chambers.
Introduction:We have recently shown [1, 2] that the use of time reversal techniques, as applied in highly reverberating mediums, allows control of the spatial distribution and polarisation of pulsed wavefronts as long as the system developed is reciprocal and time invariant. The interest of the system proposed, called a time reversal electromagnetic chamber (TREC), resides in the ability to control the wavefront propagation direction, polarisation and time dependence in real time. This is achieved by modifying the excitation signal applied to a set of antennas, placed within the facility. These antennas are referred to as the time reversal mirror (TRM) in the literature [3]. The advantage here is that there is no need of any mechanical movements of the antennas or the equipment under test (EUT) thanks to the multiple reflections on the cavity walls. The procedure for obtaining these signals will be described in the following Section.In this Letter, we prove that the TREC can be implemented in a reallife scenario thanks to an experimental validation of the system.
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