1,721,116 research outputs found
Un metodo ibrido MoM-FEM nel dominio del tempo per l’analisi della reirradiazione elettromagnetica da corpi penetrabili
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Una Nuova Tecnica per l’Analisi dello Scattering da Superfici Finite Liscie o Debolmente Ondulate
No full textAn Extended Equivalent Circuit Model for Reconfigurable Intelligent Surfaces
No full textThe circuit model of a dual polarized resonant reconfigurable intelligent surface is discussed. The RIS is characterized by two resonances where the phase response can be controlled. It is shown that the proposed circuit model provides an accurate prediction of the reflection properties not only for the first resonance but also for the second one
Il metodo ibrido Mode Matching - Finite Element (MM-FE) per l’analisi e la progettazione di dispositivi filtranti e array di guide d’onda di grandi dimensioni
No full textMM-wave and THz design strategies of Reconfigurable Intelligent Surfaces
No full textReflecting Intelligent Surfaces (RISs) have garnered considerable attention as a viable solution for wireless communication systems in recent years1. RISs operate by manipulating the phase and amplitude of incoming signals through precise adjustments in surface impedance2, 3. Moreover, RISs offer real-time dynamic changes in impedance and reflectivity, enabling various advantages for wireless communication systems such as enhanced spectral efficiency, expanded coverage, and reduced interference4. Several techniques are employed to achieve reconfigurability in RISs, including the utilization of Varactor Diodes5-7, PIN Diodes8, 9 and MEMS10
Comparative analysis of dual-polarized varactor loaded Reconfigurable Intelligent Surfaces
No full textA comparative analysis of different varactor loaded RIS elements is presented. In particular, three dual polarized element topologies are compared by selecting the same substrate properties and the same tunable lumped elements. It is shown that the elements are characterized by two resonances where the phase response can be controlled. The fundamental resonance is typically characterized by low loss with respect to the second resonance. However, at the first resonance, the unit cell is smaller in terms of wavelength with respect to the second resonance. This implies higher number of varactors diodes are necessary to control the RIS with a consequent increase of the cost
Analisi di Phased Array di Dimensioni Finite mediante un Metodo Ibrido Mode Matching/FEM
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