Year: 2021
Type: article
Abstract: The passive estimation of impulse responses from ambient noise correlations arouses increasing interest in seismology, acoustics, optics, and electromagnetism. Assuming the equipartition of the noise field, the cross-correlation function measured with noninvasive receiving probes converges towards the difference of the causal and anticausal Green's functions. Here, we consider the case when the receiving field probes are antennas which are well coupled to a complex medium-a scenario of practical relevance in electromagnetism. We propose a general approach based on the scattering matrix formalism to explore the convergence of the cross-correlation function. The analytically derived theoretical results for chaotic systems are confirmed in microwave measurements within a mode-stirred reverberation chamber. This study provides fundamental insight into the Green's function retrieval technique and paves the way for a new technique to characterize electromagnetic antennas.
Source: Physical review. E
Institutions: Centre National de la Recherche Scientifique, Institut National des Sciences Appliquées de Rennes, Institut d'Électronique et des Technologies du numéRique, Université de Rennes, Université Côte d'Azur, Institut de Physique de Nice, Université Paris Sciences et Lettres, Institut Langevin, ESPCI Paris, Université Gustave Eiffel, Laboratoire d'électronique, systèmes de communication et microsystèmes, Brunel University of London
Language: English
Subfield: Acoustics and Ultrasonics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W3202856580