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

By M. Davy, J. De Rosny and P. Besnier

Abstract

International audienceWe 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

Topics: Anechoic chambers, Electromagnetic waves, Reverberation, Units of measurement, Cross correlations, Impedance mismatch, Matched antennas, Mode-stirred, Perfectly matched, Reverberation chambers, Time reversal, Wavefields, Antennas, [ INFO.INFO-NI ] Computer Science [cs]/Networking and Internet Architecture [cs.NI], [ SPI.TRON ] Engineering Sciences [physics]/Electronics
Publisher: Institute of Electrical and Electronics Engineers Inc.
Year: 2016
DOI identifier: 10.1109/MetroAeroSpace.2016.7573204
OAI identifier: oai:HAL:hal-01397915v1
Provided by: Hal-Diderot
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