Broadband transmission-line illusions based on transformation electromagnetic
Graduate School of Science and Engineering, Kagoshima University, Kagoshima 890-0065, Japan
2 Graduate School of Engineering Science, Osaka University, Osaka 560-8531, Japan
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Accepted: 11 October 2019
Published online: 21 November 2019
We demonstrate broadband transmission-line illusions based on transformation electromagnetics at microwave frequencies by using the distributed full-tensor anisotropic medium. Due to an intrinsic nature of the non-resonant unit cell of the medium, the illusions operate from DC to an upper limit frequency where the homogeneous medium approximation holds. Two-dimensional groove and bump illusion media mimicking scattered waves by an original groove and a bump are designed. Their broadband and incident angle independent operations are confirmed by circuit simulations. The groove illusion medium is implemented on a dielectric substrate with microstrip-line technology, and it is confirmed experimentally by near-field measurements that the illusion medium well mimics scattered waves by the original groove in the broadband frequency range from 2.60 GHz to 4.65 GHz.
Key words: Electromagnetic illusion / transformation electromagnetics / metamaterials
© T. Nagayama and A. Sanada, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.