A5030441412- Antenna Design and Analysis
- Photonic and Optical Devices
- Microwave Engineering and Waveguides
- Advanced Antenna and Metasurface Technologies
- Energy Harvesting in Wireless Networks
- Advanced Fiber Laser Technologies
- Wireless Body Area Networks
- Electromagnetic Compatibility and Measurements
- Bluetooth and Wireless Communication Technologies
- Optical Network Technologies
- Electromagnetic Fields and Biological Effects
- Antenna Design and Optimization
- Fuel Cells and Related Materials
- Advanced Photonic Communication Systems
- Gyrotron and Vacuum Electronics Research
- Photorefractive and Nonlinear Optics
- Molecular Communication and Nanonetworks
- Nanopore and Nanochannel Transport Studies
- Plasmonic and Surface Plasmon Research
- Photonic Crystal and Fiber Optics
- Solid State Laser Technologies
- Advanced Fiber Optic Sensors
- Particle Accelerators and Free-Electron Lasers
- Analytical Chemistry and Sensors
- Particle accelerators and beam dynamics
École Polytechnique Fédérale de Lausanne
2021-2024
Polytechnic University of Bari
2007-2020
Instituto Politécnico Nacional
2003-2011
Telecom Italia Lab
2010
Universitat Politècnica de València
2009
University of Milan
1988-1989
University of Bari Aldo Moro
1982
On-body communication channels are of increasing interest for a number applications, such as medical-sensor networks, emergency-service workers, and personal communications. This paper describes investigations into channel characterization antenna performance at 2.45 GHz. It is shown that significant fading occurs during normal activity, due primarily to the dynamic nature human body, but also multipath around body from scattering by environment. can be mitigated use diversity, gains up 10...
An annular slot antenna suitable for pattern diversity in wideband applications is presented. Pattern obtained by feeding the simultaneously with two microstrip lines printed on back of substrate, which generate orthogonal radiation patterns. Two shorts placed at 45 degrees between and opposite direction ensure an isolation above 15 dB according to measurements. The operates range frequencies from 3 GHz 12 (1:4 bandwidth) covers many different standards (Wireless-LAN, HIPERLAN2, WIMAX, UWB)....
Abstract To improve mass transport limitations in proton exchange membrane fuel cells (PEMFCs), a detailed analysis of the gas diffusion layer structure can help understand processes oxygen to catalyst and liquid water removal mechanism. Herein, effect tortuosity was studied using two different microporous (MPL) structures their hydrophobic hydrophilic clones. Focused ion beam – scanning electron microscopy tomography showed that all had similar porosity but characteristic pore diameters....
A time-dependent numerical model of a dysprosiumdoped ZBLAN glass fiber is developed in order to design pulsed laser emitting at about 3 μm wavelength, by employing an in-band pumping scheme. number parameters are changed optimize the performance. Gain-switching regime with output signal peak power close 59 W and full width half maximum pulse duration shorter than 184 ns simulated for dopant concentration 2000 ppm, input pump 5 repetition rate 100 kHz wavelength 2.8 μm. These characteristics...
Non-noble metal catalysts (NNMCs) are regarded as a promising alternative to the costly Pt-based materials required catalyze oxygen reduction reaction (ORR) in proton exchange membrane fuel cell (PEMFC) cathodes. However, large diversity of NNMC synthesis approaches reported literature results featuring wide variety particle sizes and morphologies, effect these properties on catalysts’ PEMFC performance remains poorly understood. To shed light this matter, work we studied physical...
A study is presented of wireless on-body communication links, with the body in motion. This paper compares simulations and measurements path gain (PG) on moving male female bodies. Simulations using avatars derived from an animation software have been performed at 2.45 GHz. Male walking a rising chair simulated results are compared carried out anechoic chamber. The show that good agreement between simulation measurement slow fading features can be achieved for reasonable computational effort.
A microporous layer (MPL) is typically added to the gas diffusion of polymer electrolyte fuel cells (PEFCs) promote cell performance and water management. The transport mechanism through MPL is, however, not well understood due its small pores (20–500 nm). Here, we demonstrate that polychromatic X-ray tomographic microscopy (XTM) can be used determine porosity spatial distribution in nanoporous materials quantitatively map liquid saturation MPLs. presented technique requires no a priori...
As wearable electronic devices become increasingly popular, there is a growing interest in the design of body area networks (BAN). The propagation characteristics such channels are to assist proper BAN systems. It has been shown that movement primary factor channel fading and hence modelling must include effect movement. In this letter, results presented for walking phantom created using animation software. Simulations avatar three different at frequency 2.45 GHz compared measurements made...
High activity and durability are two key requirements for the successful development of Pt-based ORR catalyst layers polymer electrolyte fuel cell (PEFC) cathodes. Unsupported Pt–Ni aerogels consisting an interconnected nanoparticle network have been shown to fulfill these requirements, but in our previous work, their processing into high-performing (CLs) required inclusion a pore inducer preparation catalyst-coated membranes (CCMs) through hand spraying. Since results latter approach highly...
This paper presents an antenna that works in the infrared frequencies band to collect solar energy for supplying a resistive load. The designed antenna, named "rectenna", is golden rectangular spiral printed on SiO2 layer with ground plane back. Two configurations of antennas were investigated order design structure able supply maximum output current. An array configuration was proposed improve single performance.
The application of tapering techniques to two-dimensional photonic bandgap (2D-PBG) microstrip structures allows great improvement in the sidelobe level S11 scattering parameter and, consequently, a very flat passband. In this paper, many windows are proposed for 2D-PBG canonical (straight line) stopband filters. By suitably designing three rows tapered periodic which characterised by different centre frequency stopband, novel lowpass filter was realised and characterised. Numerical...
A homemade computer code for designing the coupled microwave cavities of a linear accelerator (linac) has been developed. hybrid approach, based on both analytical investigation and numerical calculation, is exploited. finite-element method (FEM) 2-D/3-D electromagnetic simulation software used to find eigenmodes eigenfrequencies as well design typical figures merit. The FEM integrated with multiobjective particle swarm optimization approach in order automatically optimize geometry...
Wireless body area networks (WBANs) promise unobtrusive and cheap interconnections of electronic based sensors, processors other devices thank to low-profile, compact easily integrated worn antennas. The paper, with the combination animation electromagnetic software, presents modelling human in motion during normal daily activities such as a walk. Simulations walking male at frequency 2.45 GHz for two different channels are presented results compared measurements made anechoic chamber....
In this paper, different technologies enabling wireless on-chip communication are investigated. particular, plasmonic Vivaldi antennas coupled to silicon waveguides and all-dielectric proposed. The design criteria the performances of two antenna configurations also discussed.
Water management by gas diffusion electrodes is a fundamental aspect of the performance electrochemical cells. Herein, we introduce characteristic constrictions size as descriptor for microporous layers (MPL). This parameter calculated volumetric analysis focused ion beam nanotomography and compared to mercury intrusion porosimetry measurements.
Wireless Body Area Networks (WBANs) promise cheap and unobtrusive interconnections of electronic based sensors, processors other devices during normal daily activities in personal, military sports use. However the modelling body dynamics raises difficulties when simulation channels is required. In this paper activity walking has been studied, through combination animation electromagnetic software. Simulations a male at frequency 2.45 GHz for two different are presented these results compared...
In this paper a preliminary electromagnetic shielding behaviour of metal foams, is developed and discussed. Metal foams represent novel class materials which promise new interesting properties employable for various purposes. More specifically, the realization shields has been considered experimental Shielding Effectiveness (SE) measurements have performed, demonstrating very good performance. order to allow design foam EM shields, double 3D wire-mesh screens, obtained as development...
In this paper the design of a handheld light applicator for microwave heating is presented. The made an array resonant longitudinal slots cut on broad wall rectangular waveguide, and it covered by cylindrical lens Plexiglas with permittivity 2.53. geometrical optics approach used as initial approximation to establish profile. It allows shaping slotted waveguide's radiation pattern into desired output in transversal plane. Three-dimensional simulation results show that performance can be...
In this paper, we propose an integrated Vivaldi antenna, coupled to a silicon waveguide, for wireless Optical Network-on-Chip applications. On-chip propagation characteristics and point-to-point link performances in homogeneous multilayered medium are investigated discussed as well. The proposed structure allows the implementation of communication at optical frequencies it can lead completely new approach network design, allowing hybrid wireless/wired communications on same die. This...
It is well known that the hyperthermia (HT) treatment method in cancer therapy makes use of controlled electromagnetic heating patient's body. With regard to deep body therapy, we have reviewed this paper most recent technology and technique (Sigma-Eye applicator) based on annular phased arrays (APA) antennas. In order improve performance Sigma-Eye applicator, a new profile antenna was designed using substrate material with high permittivity. The good results simulations compared classical...