Article
Engineering, Electrical & Electronic
X. Ma, M. S. Mirmoosa, S. A. Tretyakov
Summary: This study introduces a new type of waveguides designed using Metasurfaces, examines guided modes and dispersion properties, and discusses general conditions for the existence of two modes with orthogonal polarization and the same phase velocity. Further research is conducted on scenarios with nonresonant or resonant surface impedances and varying distances between two metasurfaces.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Constantinos Valagiannopoulos, Adilkhan Sarsen, Andrea Alu
Summary: Nonlinear materials can exhibit bistability, which can find direct application to photonic memory devices. Impedance metasurfaces producing hysteresis responses with respect to impinging beam angle under a fixed intensity profile can open new avenues towards the design of photonic systems supporting a wide range of fixed-power memory functionalities.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Ana Diaz-Rubio, Sergei A. Tretyakov
Summary: In the face of challenging requirements for future mobile communication systems, researchers are exploring the potential of creating intelligent radio environments using reconfigurable and smart metasurfaces. These metasurfaces can redirect incident waves in desired directions and their behavior when illuminated from other directions as well as how scattering from finite-sized anomalous reflectors can be estimated is crucial. Models have been developed to explain the behavior of phase-gradient metasurfaces and anomalous reflections, providing a foundation for integrating these elements into propagation channel ray-tracing models.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Acoustics
A. Palermo, B. Yousefzadeh, C. Daraio, A. Marzani
Summary: This study investigates the propagation of Rayleigh waves in a half-space coupled to a nonlinear metasurface, analyzing the effects of nonlinear interaction force and energy loss on wave dispersion. The research presents closed-form expressions to predict the dispersive characteristics of nonlinear Rayleigh waves, demonstrating how different types of nonlinearity affect spectral gaps in the metasurface and revealing spatial gaps induced by softening nonlinearity in dispersion curves.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Engineering, Electrical & Electronic
Mohammad Amin Chaychi Zadeh, Nader Komjani
Summary: A novel method is proposed to synthesize a flat-topped pattern in single-curvature conformal leaky-wave antennas (CLWAs). The design process considers aperture field estimation, the holographic principle, the transformation optic approach, and the effects of the geometrical parameters of a curved structure on the far-field radiation pattern. Three software packages are used to achieve the desired radiation pattern. The fabricated and tested CLWA shows good agreement between simulation and measurement results.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Chun-Wen Lin, Anthony Grbic
Summary: This study focuses on developing a method to realize arbitrary scattering matrices with cascaded, azimuthally invariant metasurfaces and dielectric spacers by studying wave propagation in the radial direction of cascaded cylindrical structures. The proposed method uses a wave matrix formulation to relate incident and scattered fields on different sides of the scatterer. Design examples are demonstrated and verified through a commercial electromagnetic solver, with the cascaded cylindrical metasurfaces expected to have applications in antenna beam steering, polarization manipulation, and hologram generation.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Iman Derafshi, Nader Komjani
Summary: In this letter, a new technique based on passive 2-D Huygens metasurface is investigated for controlling the beam of a linear polarized horn antenna. The required surface electrical and magnetic impedance equivalent to HMS is calculated using plane wave terms in the spectral-domain for dominant mode. Two different structures are designed and simulated, showing improvement in aperture efficiency compared to similar works.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Constantinos Valagiannopoulos
Summary: Multistability is a key effect in memory components of various electronic, chemical, biological, and quantum systems, enabling different outputs based on past input values. We discovered that two electromagnetic metasurfaces with nonlinear Kerr-type admittances exhibit significant multistability in transmissivity. This feature arises from the discontinuous response caused by the change in material nature from dielectric to plasmonic and vice versa at different levels of input power.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Computer Science, Information Systems
Gengyu Xu, Vasileios G. Ataloglou, Sean Victor Hum, George Eleftheriades
Summary: This study presents an end-to-end design of compact and low-loss metasurface antennas with integrated feeds. The antennas are implemented with a single-layered reactive impedance metasurface on top of a grounded dielectric substrate, and are fed by embedded sources. An accurate model is developed for rapid optimization of the wire impedances, leading to desired radiation characteristics and extreme field transformations. The design framework also includes feasibility-related constraints for enhanced power efficiency and bandwidth. The study demonstrates the capabilities of the design framework through the realization of wide-angle beamforming and multi-input, multi-output antennas with high aperture efficiency.
Article
Nanoscience & Nanotechnology
Enrica Martini, Federico Giusti, Alice Benini, Stefano Maci
Summary: This paper investigates anisotropic self-complementary metasurfaces (SC-MTSs) consisting of complementary inductive and capacitive strips that are self-dual according to Babinet’s duality principle. These metasurfaces support the propagation of two orthogonally polarized surface-wave modes with the same phase velocity along the principal directions. The isofrequency dispersion curves of these modes are hyperbolas, and in some cases, they degenerate into almost straight lines. This property allows the SC-MTS to be used for designing dual-polarized leaky-wave antennas by modulating the impedances of the complementary strips.
Article
Engineering, Electrical & Electronic
Marino Coppolaro, Massimo Moccia, Giuseppe Castaldi, Andrea Alu, Vincenzo Galdi
Summary: Electromagnetic metasurfaces enable advanced control of surface-wave propagation by spatially tailoring local surface reactance. Spatial modulations of surface resistance between positive and negative values induce peculiar dispersion effects far beyond mere compensation. A class of non-Hermitian metasurfaces exhibiting extreme anisotropy induced by gain-loss interplay are proposed and explored.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2021)
Article
Engineering, Electrical & Electronic
Sanghoon Kim, Aobo Li, Jiyeon Lee, Daniel F. Sievenpiper
Summary: The article introduces a novel metamaterial surface that actively tunes its resonance frequency to absorb electromagnetic waves, achieving a self-tuning function. Experimental results confirm the performance of the metamaterial surface and the increase in absorption frequency range, demonstrating high practical value.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Danilo Brizi, Maria Conte, Agostino Monorchio
Summary: In this article, a new antenna utilizing specially designed metasurfaces is introduced to improve radiating performance near the human body in microwave biomedical applications. Design guidelines are presented to realize a thin metasurface acting as an impedance matching layer between the radiating element and biological tissue. Additionally, an artificial magnetic conductor (AMC) is combined as the backing element of the antenna for the first time to improve gain and reduce undesired back radiation.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Mechanical
Yifei Xu, Zhigang Cao, Kemeng Cui, Yuanqiang Cai, Xingbo Pu
Summary: In this study, an original analytical formulation is proposed to investigate the interaction between seismic Love waves and a metasurface composed of tunable anti-plane resonators. The formulation utilizes the Green's function to describe the incident and scattered fields and derives a dispersion relation for hybrid Love waves using the effective medium approximation. The capabilities of the analytical formulation are demonstrated through modeling Love waves propagating across resonators, revealing complex phenomena and hybridization features.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Mechanical
Xingbo Pu, Antonio Palermo, Alessandro Marzani
Summary: In this study, the dynamic behavior and topological properties of quasiperiodic elastic metasurfaces are investigated. The research reveals a fractal distribution of frequency gaps and demonstrates that topologically protected edge modes can be driven by parameter variation.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Electrical & Electronic
Massimiliano Casaletti, Maciej Smierzchalski, Mauro Ettorre, Ronan Sauleau, Nicolas Capet
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2016)
Article
Engineering, Electrical & Electronic
Ioannis Iliopoulos, Massimiliano Casaletti, Ronan Sauleau, Philippe Pouliguen, Patrick Potier, Mauro Ettorre
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2016)
Article
Engineering, Electrical & Electronic
Massimiliano Casaletti, Guido Valerio, Ronan Sauleau, Matteo Albani
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2016)
Article
Optics
S. C. Pavone, M. Ettorre, M. Casaletti, M. Albani
Article
Optics
F. Defrance, M. Casaletti, J. Sarrazin, M. C. Wiedner, H. Gibson, G. Gay, R. Lefevre, Y. Delorme
Article
Engineering, Electrical & Electronic
M. Teniou, H. Roussel, N. Capet, G. -P. Piau, M. Casaletti
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2017)
Article
Engineering, Electrical & Electronic
Davide Comite, Guido Valerio, Matteo Albani, Alessandro Galli, Massimiliano Casaletti, Mauro Ettorre
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2017)
Article
Engineering, Electrical & Electronic
Mounir Teniou, Helene Roussel, Mohammed Serhir, Nicolas Capet, Gerard-Pascal Piau, Massimiliano Casaletti
INTERNATIONAL JOURNAL OF MICROWAVE AND WIRELESS TECHNOLOGIES
(2018)
Article
Geochemistry & Geophysics
L. Hettak, H. Roussel, M. Casaletti, R. Mittra
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2018)
Proceedings Paper
Engineering, Electrical & Electronic
L. Hettak, H. Saleh, C. Dahon, M. Casaletti, O. Meyer, J-M. Geffrin, H. Roussel
2017 INTERNATIONAL CONFERENCE ON ELECTROMAGNETICS IN ADVANCED APPLICATIONS (ICEAA)
(2017)
Proceedings Paper
Engineering, Electrical & Electronic
Lydia Hettak, Helene Roussel, Massimiliano Casaletti, Cyril Dahon, Raj Mittra
2017 11TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP)
(2017)
Proceedings Paper
Engineering, Electrical & Electronic
M. Teniou, H. Roussel, N. Capet, G-P. Piau, M. Casaletti
2017 11TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP)
(2017)
Proceedings Paper
Engineering, Electrical & Electronic
Qiang Zhang, Julien Sarrazin, Massimiliano Casaletti, Luca Petrillo, Philippe De Doncker, Aziz Benlarbi-Delai
2017 11TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP)
(2017)
Proceedings Paper
Engineering, Electrical & Electronic
I. Iliopoulos, M. Ettorre, M. Casaletti, R. Sauleau, P. Pouliguen, P. Potier
2016 10TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP)
(2016)
Proceedings Paper
Engineering, Electrical & Electronic
Santi C. Pavone, Mauro Ettorre, Massimiliano Casaletti, Matteo Albani
2016 10TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP)
(2016)