arXiv subjects

Andrea Francesco Morabito

Publications and source records attributed to Andrea Francesco Morabito.

3 recordsLinked to original sources

arXiv2022

Effective Non-Iterative Phase Retrieval of 2-D Bandlimited Signals with Applications to Antenna Characterization and Diagnostics

The Phase Retrieval problem is dealt with for the challenging case where just a single set of (phaseless) radiated field data is available. In particular, even still emulating the solution of crosswords puzzles, we provide decisive improvements over our recent approaches. In fact, by exploiting bandlimitedness and a suitable set of intersecting curves, we definitively lower the computational complexity (thus eliminating drawbacks) of our previous techniques. Numerical examples, concerning applications of actual interest, support the given theory and confirm the effectiveness of the developed procedure.

eess.SP↗

arXiv2018

Orbital Angular Momentum Antennas: Understanding Actual Possibilities Through the Aperture Antennas Theory

We propose a simple method based on the Aperture Antennas Theory to understand in a simple fashion limitations of OAM antennas in far-field links. Additional insight is also given by analyzing the properties of the operators relating source and far-field distributions for a given order of the vortex. The outcomes fully agree with the results recently achieved by Edfors, Craeye, and co-authors, and emphasize some additional draw-back. The "degrees of freedom" of the fields associated to the different orders of the vortices are also discussed.

physics.class-ph↗

arXiv2018

Design of Graded Photonic Crystals Antennas via Inverse Scattering based techniques

A new approach to the design of graded Photonic Crystals (GPCs) devices is proposed by exploiting the inverse scattering framework as a synthesis tool. The introduced general methodology can be applied to arbitrary far-field specifications, thus allowing to design non-canonical devices. In particular, two different strategies are developed which allow to deal with GPCs with both graded refractive index (GPC_R) and graded filling factor (GPC_F). In both strategies, the inverse scattering problem is solved by a proper reformulation of the Contrast Source Inversion method wherein a proper rescaling of the amplitude of the primary sources is pursued. In particular, in the first one, the GPCs are obtained by exploiting homogenization theories. In the second one, the GPC_R profile is synthesized by exploiting a suitable representation basis for the unknown contrast function and, then, simple analytical formulas are used to determine a GPC_F. The proposed approach is assessed through the synthesis of an antenna generating $Σ/Δ$ reconfigurable patterns.

physics.app-ph↗