A5002322047- Advanced Antenna and Metasurface Technologies
- Antenna Design and Analysis
- Electromagnetic Scattering and Analysis
- Antenna Design and Optimization
- Metamaterials and Metasurfaces Applications
- Radio Astronomy Observations and Technology
- Microwave Engineering and Waveguides
- Electromagnetic Compatibility and Measurements
- Electromagnetic Simulation and Numerical Methods
- Microwave Imaging and Scattering Analysis
- Energy Harvesting in Wireless Networks
- Ocean Waves and Remote Sensing
- Geophysical Methods and Applications
- Soil Moisture and Remote Sensing
- Wireless Body Area Networks
- Precipitation Measurement and Analysis
- Photonic Crystals and Applications
- Geophysical and Geoelectrical Methods
- Radio Wave Propagation Studies
- Indoor and Outdoor Localization Technologies
- Advanced MIMO Systems Optimization
- Millimeter-Wave Propagation and Modeling
- Coastal and Marine Dynamics
- Direction-of-Arrival Estimation Techniques
- RFID technology advancements
UCLouvain
2015-2024
Queen Mary University of London
2021
Dar al Athar al Islamiyyah
2021
Gemeente Den Haag
2019
Universidad de Extremadura
2017
Institute of Information and Communication Technologies
2017
Roma Tre University
2014
Delft University of Technology
2014
University of Edinburgh
2014
University of Wisconsin–Madison
2013
Abstract Metasurfaces are thin two-dimensional metamaterial layers that allow or inhibit the propagation of electromagnetic waves in desired directions. For example, metasurfaces have been demonstrated to produce unusual scattering properties incident plane guide and modulate surface obtain radiation properties. These employed, for create innovative wireless receivers transmitters. In addition, recently proposed confine waves, thereby avoiding undesired leakage energy increasing overall...
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> The impact of mutual coupling induced by two closely spaced minimum scattering antennas at the subscriber unit on 2 <formula formulatype="inline"><tex>$\times$</tex></formula> multiple-input multiple-output channels and communications is investigated. Both (de)correlation effects variations antenna gain resulting from mechanisms are considered. Relationships between correlations/channel Frobenius...
A new approach is presented for synthesizing modulated metasurface (MTS) antennas (MoMetAs) with arbitrary radiation patterns, assumed to be given in amplitude, phase, and polarization. The MTS defined on a circular domain represented as continuous sheet transition impedance boundary condition (IBC) the top of grounded substrate. proposed method relies an entire-domain discretization electric field integral equation (EFIE). Via dyadic Green's function substrate, desired pattern translated...
Multibeam and beam-scanning capabilities of metasurface (MTS) antennas using multiple feeds are investigated. The MTS synthesis is performed by direct inversion an electric field integral equation (EFIE) obtained after expanding the unknown equivalent impedance profile into Fourier-Bessel basis functions. Two approaches explored. first one assumes a priori discrete azimuthal symmetry in profile, so as to constrain solution subspace which automatically provides beams when illuminated with...
Using wireless sensors worn on the body to monitor health information is a promising new application. To realize transceivers targeted for these applications, it essential understand area propagation channel. Several numerical, simulated, and measured studies have recently been conducted. While many of are useful evaluating communication systems, they not compared against or justified by more fundamental physical models derived from basic principles. This type comparison necessary provide...
We show that the public experiment held in Venice by F. Tamburini et al and reported (2012 New J. Phys. 14 033001) can be regarded as a particular implementation of Multiple-Input Multiple-Output (MIMO) communications, hence bringing no advantages with respect to known techniques. Moreover, we explain use 'vortex' mode (orbital angular momentum OAM l = 1) at one transmit antennas is not necessary encode different channels since only patterns -or similarly pointing angles- are required....
A fast full-wave simulation technique is presented for the analysis of large irregular planar arrays identical 3-D metallic antennas. The solution method relies on Macro Basis Functions (MBF) approach and an interpolatory to compute interactions between MBFs. Harmonic-polynomial (HARP) model established near-field in a modified system coordinates. For extremely made complex antennas, two approaches assuming limited radius influence mutual coupling are considered: one based sparse-matrix LU...
Abstract We present an analysis of ring-wave and scatterometer data from a water surface that was agitated by simulated rain. Water droplets 2.8mm diameter impacted the at almost terminal velocity, rain rates cover wide range conditions (5 to 200mm hr−1). Both energy backscattered power GHz increase as R increases, but growth slacken higher intensities. Ring-wave frequency spectra wavenumber are well represented log-Gaussian spectral models. The results can be used guide development...
A fast numerical method, well-suited to the analysis of moderate-size arrays made complex elements, is presented. It combines macro basis functions and multipole approaches, without an iterative procedure. This method exploited estimate impedance matrix active element patterns. For latter, efficient formulation provided, as a series pattern multiplication problems. Examples are shown for broadband dipoles. The computational gain obtained reduction original moments system equations briefly described
A family of orthogonal and entire-domain basis functions (named Fourier-Bessel) is proposed for the analysis circular modulated metasurface (MTS) antennas. In structures at hand, MTS accounted in electric field integral equation (EFIE) as a sheet transition impedance boundary condition on top grounded dielectric slab. The closed-form Hankel transform Fourier-Bessel (FBBFs) allows one to use spectral domain formulation method-of-moments (MoM) solution EFIE. Moreover, these are fully...
An efficient method-of-moments (MoM) technique for analyzing non-periodic antenna arrays of identical elements with fixed orientation is presented. The proposed method, which uses macro basis functions (MBFs), based on a compact representation the interactions between MBFs. These are expressed via low-order harmonic-polynomial function after an explicit pre-computation reaction integrals in very limited set relative positions. This possible arbitrary size thanks to three transformations-...
We show that the reply by Tamburini et al (2012 New J. Phys. 14 118002) to our previous comment 118001) on experiment reported in 033001) does not actually invalidate any of issues raised initial comment.
A method is proposed for the synthesis of large planar non-regular arrays assuming constant magnitude excitation elements. The approach, which combines global and local optimization, based on distinguishing aperture-type non-coherent parts array factor. following constraints are considered: minimal separation antennas, maximum size fixed mainbeam width. level sidelobes reduced via minimization a new type flexible averaging cost function an Lp-norm. Possible applications this model lie in...
The selection of a near-field or far-field ground-penetrating radar (GPR) model is an important question for accurate but computationally effective characterization medium electrical properties using full-wave inverse modeling.In this study, we determined antenna height threshold the and farfield GPR models by analyzing variation spatial derivatives Green's function over aperture.The obtained results show that ratio to maximum dimension aperture approximately equal 1.2.Subsequently,...
A quasi-analytical solution is derived for the transmittance between two OAM antennas. It makes use of properties modified circle polynomials, related to Zernike functions, and integration in complex plane radial spectral coordinate. The resulting formulation can be estimated extremely fast shown exhibit several expected properties. An asymptotic expression proposed validated.
A recent synthesis paradigm for tailoring the far-field radiation of leaky wave (LW) radiating metasurface (MTS) antennas is reviewed and experimentally validated. The considered are realized with electrically small patches printed on a planar grounded dielectric slab. patch layer modeled as an impedance sheet whose spatial variation initially designed to provide desired LW effect from prespecified surface (SW) excitation.