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. 2018 Dec 13;9:5299. doi: 10.1038/s41467-018-07809-3

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — Bianisotropic meta-atom design. a A bianisotropic meta-atom is embedded in a conventional wall. An incident wave p_i produced by an external speaker propagates through the conventional wall. The bianisotropic response of the particle, p_b, and the transmission though the wall, p_c are recorded at point A situated 2 cm behind the particle. b The bianisotropic meta-atom is composed of monopole and dipole transducers connected through the amplifier of impulse response g. The dipole driver is implemented as two back-to-back speakers driven 180° out-of-phase and generates pressure fields of inverse polarity in the two semi-planes separated by the dipole’s anti-symmetry plane. The monopole sensor is placed in the antisymmetry plane of the dipole source and senses zero net pressure generated by the dipole. c, Amplitude of p_b/p_c measured on the meta-atom transmission side 1 cm behind the meta-atom versus measured amplitude of amplifier impulse response g. d, Measured phases of p_b/p_c and g