Time reversal with absorbing antennas in a mode-stirred reveberation chamber

M. Davy 1 J. de Rosny 2 P. Besnier 1
1 IETR - Institut d'Electronique et de Télécommunications de Rennes
2 Institut Langevin ondes et images
Abstract : We demonstrate analytically that a single matched antenna absorbs 100% of the electromagnetic energy in a perfect time-reversal (TR) experiment. In contrast to TR with pointlike antennas, the usual diverging wave at positive times vanishes. When the antenna is not perfectly matched, the amplitude of this diverging wave relative to the converging one is equal to the impedance mismatch. This result is confirmed in measurements in a mode-stirred electromagnetic reverberation chamber. We finally discuss the impact of this result on the cross-correlation of a random wavefield with two absorbing receivers. © 2016 IEEE.
Keywords : Anechoic chambers Electromagnetic waves Reverberation Units of measurement Cross correlations Impedance mismatch Matched antennas Mode-stirred Perfectly matched Reverberation chambers Time reversal Wavefields Antennas
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Conference papers
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01397915
Contributor : Laurent Jonchère <>
Submitted on : Wednesday, November 16, 2016 - 2:25:25 PM
Last modification on : Thursday, April 4, 2019 - 1:31:24 AM

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IETR | UNIV-RENNES1 | ESPCI | UPMC | IL | LANGEVIN | PSL | IETR-INSA | PARISTECH | UR1-UFR-ISTIC | IETR-WAVES | IETR-SHINE | UNIV-RENNES | INSA-RENNES | INSA-GROUPE | SORBONNE-UNIVERSITE | SU-SCIENCES | UNIV-PARIS7 | USPC

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M. Davy, J. de Rosny, P. Besnier. Time reversal with absorbing antennas in a mode-stirred reveberation chamber. 3rd IEEE International Workshop on Metrology for Aerospace, MetroAeroSpace 2016, Jun 2016, Florence, Italy. pp.156--160, ⟨10.1109/MetroAeroSpace.2016.7573204⟩. ⟨hal-01397915⟩

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