Alessandro Galli

Sapienza University of Rome

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Paolo Burghignoli

Sapienza University of Rome

188

Paolo Baccarelli

Roma Tre University

186

Walter Fuscaldo

Institute for Microelectronics and Microsystems

132

Davide Comite

Sapienza University of Rome

105

Guido Valerio

Université Paris Cité

Fabrizio Frezza

Sapienza University of Rome

P. Lampariello

Institute of Electronics, Computer and Telecommunication Engineering

David R. Jackson

University of Houston

S. Paulotto

Sapienza University of Rome

C. Di Nallo

Motorola (United States)

Cooperative Institutions

Sapienza University of Rome

159

Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati

134

National Agency for New Technologies, Energy and Sustainable Economic Development

Istituto Nazionale di Fisica Nucleare

Istituto Nazionale di Fisica Nucleare, Sezione di Roma I

Roma Tre University

National Research Council

Karlsruhe Institute of Technology

Istituto Nazionale di Fisica Nucleare, Sezione di Napoli

Gemeente Den Haag

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Novel behaviours of guided and leaky waves in microwave ferrite devices

Paolo Baccarelli C. Di Nallo Fabrizio Frezza Alessandro Galli P. Lampariello

This work analyses original electromagnetic properties of a class of non-reciprocal components for new interesting applications in microwave and millimetre-wave passive devices and antennas. Our attention is here focused on the modal properties of basic waveguiding structures employing ferrite materials, such as the grounded slab or the non-radiative dielectric guide. The relevant full-wave spectrum of real and complex modal solutions is rigorously derived. As a result, a number of quite unusual propagation behaviours are emphasised as a function of the physical and geometrical parameters involved. Anomalous phenomena are illustrated for the dispersion curves of both proper and improper waves. Such solutions have to be deeply investigated for their physical nature and practical implications.

Reciprocal

10.1109/melcon.1996.551607

Cite

Citations (1)

Modelli circuitali di antenne a geometria frattale

Alessandro Galli Alessandra Adrover Paolo Baccarelli Massimiliano Giona Paolo Burghignoli

Source

Cite

Citations (0)

Dual-Differential SIW-Fed Leaky-wave Antenna with Dual-Polarization for Full-Duplex Applications

2022 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (AP-S/URSI) (2022)

I. Shahzadi Maksim Kuznetcov Davide Comite Symon K. Podilchak Paolo Baccarelli

This paper presents a dual-polarized leaky-wave antenna (LWA) for full-duplex (FD) communication applications. The design is based on slots fed by substrate integrated waveguides (SIWs) with differential feeding. This SIW feeding and slot arrangement, which realizes two orthogonal and linear polarizations in the far field, is then used to excite leaky-wave (LW) fields on a superstrate constituted by a printed partially reflective surface (PRS). The LWA provides -10 dB impedance matching from 24 to 28 GHz (more than 15%), with isolation levels greater than 50 dB and with realized gains of 16 dBi. The proposed LWA is also compact, low profile, wideband, and offers a convenient feeding approach making the design useful for FD communications, dual-polarization, and 5G systems.

Wideband

Dual-polarization interferometry

Multi-band device

Duplex (building)

10.1109/ap-s/usnc-ursi47032.2022.9886195

Cite

Citations (3)

Annular reconfigurable metasurface for omnidirectional dual-pol leaky-wave antennas

European Conference on Antennas and Propagation (2013)

Paolo Baccarelli Paolo Burghignoli Davide Comite David Di Ruscio Alessandro Galli

A printed annular reconfigurable metasurface (ARM) comprised of concentric ring slots etched in a metal screen loaded by stubs and varactor diodes is proposed to realize two-dimensional leaky-wave antennas (LWAs) operating on a pair of azimuthally independent TM and TE cylindrical leaky modes. The metasurface, used as a superstrate for a grounded dielectric slab, is designed to achieve wavenumber equalization of the two modes. These are excited independently by means of a vertical coaxial probe and a horizontal microstrip loop, thus allowing for radiation of an omnidirectional conical beam with reconfigurable beam angle and polarization. Theoretical and numerical investigations are presented, including an ad-hoc moment-method approach for the calculation of the antenna far-field patterns.

Reconfigurable antenna

Leaky wave antenna

Varicap

PIN diode

Beam steering

Source

Cite

Citations (4)

Modal Properties of Layered Metamaterials

CRC Press eBooks (2009)

Guido Valerio S. Paulotto Paolo Burghignoli Paolo Baccarelli Alessandro Galli

10.1201/9781420054262.ch13

Cite

Citations (1)

Leaky-Wave Design of Hybrid-, TE-, and TM-Polarized Resonant Bessel-Beam Launchers for Millimeter- and Submillimeter-Wave Applications

2022 16th European Conference on Antennas and Propagation (EuCAP) (2024)

Edoardo Negri Walter Fuscaldo Paolo Burghignoli Alessandro Galli

Extremely high frequency

Submillimeter wave

Bessel beam

10.23919/eucap60739.2024.10501673

Cite

Citations (0)

A Wideband Tightly Coupled Array for Omnidirectional Pattern Synthesis

International Journal of Antennas and Propagation (2022)

Manuel Luciarini Domenico Gaetano Christian Canestri Cosmo Mitrano Walter Fuscaldo

This work presents the design of a wideband circular tightly coupled array for omnidirectional pattern generation. The proposed array works over an 8:1 bandwidth, providing very high performance in terms of active reflection coefficient, realized gain, and omnidirectional patterns with reduced ripples. The array is composed of 32 low-profile, self-complementary, bow-tie elements displaced around a metallic mast. The capacitive coupling between neighbouring elements and the implementation of a properly designed frequency selective surface allow for increasing the electrical length of each antenna while compensating for the inductive effect of the metallic mast, according to the tightly coupled and connected arrays theory. A cover layer is then inserted to improve the average gain on the azimuthal plane. Time-domain simulation results confirm the validity of the proposed approach and implementation.

Wideband

Reflection coefficient

Capacitive coupling

10.1155/2022/5051710

Cite

Citations (1)

Characterization and Comparison of Formulas for Optimizing Broadside Radiation and Null Beams in 2D Leaky-Wave Antennas

International Journal of Microwave and Wireless Technologies (2024)

Walter Fuscaldo David R. Jackson Alessandro Galli

Abstract Two-dimensional (2D) leaky-wave antennas (LWAs) are commonly designed to radiate pencil beams at broadside and/or scanned conical beams. Recently, the possibility to radiate narrow null patterns at broadside has also been preliminarily explored. In this work, we first review the design rules to obtain a pencil beam from an infinite 2D LWA and then show how they change for having a beam with a narrow null at broadside. The effects of antenna truncation are also accounted for in both cases, and numerical results show how the optimum conditions are in turn affected. Finally, full-wave validations of practical structures excited with either horizontal or vertical dipoles validate the analysis.

Broadside

Null (SQL)

Leaky wave antenna

Pencil (optics)

Directivity

10.1017/s1759078724001338

Cite

Citations (0)

The «13-lines» E.P.R. spectrum in reactor-irradiated Al2O3

Lettere al nuovo cimento della societa italiana di fisica/Lettere al nuovo cimento (1976)

Alessandro Galli

10.1007/bf02746465

Cite

Citations (3)

Analysis of the propagation and leakage effects for various classes of traveling-wave sources in the presence of covering dielectric layers

IEEE MTT-S International Microwave Symposium digest (2002)

C. Di Nallo Fabrizio Frezza Alessandro Galli P. Lampariello

The fundamental perturbation effects on the propagation properties (phase and leakage constants) of traveling-wave sources due to the presence of covering dielectric layers with arbitrary permittivity and dimensions are investigated in this work. Our analysis is applicable to several well known and used classes of leaky-wave antennas (slotted rectangular guide, stub-loaded, ridge, stepped, and so forth) when radomes are required for environmental protection. The basic step is given by the quantification of the radiation admittance for the aperture of the coated single-line source via a spectral-domain approach. Through usual transverse resonance techniques, from the straightforward calculation of the phase and leakage constants it is then possible to easily characterize the global radiation properties. Extensions to the case of coated arrays are also carried out. The results show the type and the amount of the modifications that are related to the introduction of radomes in traveling-wave antennas.

Radome

Propagation constant

Leakage (economics)

Stub (electronics)

10.1109/mwsym.1997.602865

Cite

Citations (1)