S. Paulotto

Sapienza University of Rome

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Paolo Baccarelli

Roma Tre University

Fabrizio Frezza

Sapienza University of Rome

Alessandro Galli

Sapienza University of Rome

Paolo Burghignoli

Sapienza University of Rome

David R. Jackson

University of Houston

Guido Valerio

Université Paris Cité

Giampiero Lovat

Sapienza University of Rome

P. Lampariello

Institute of Electronics, Computer and Telecommunication Engineering

Donald R. Wilton

University of Houston

William A. Johnson

JEM Engineering (United States)

Cooperative Institutions

Sapienza University of Rome

Roma Tre University

Polytechnic University of Turin

Institute of Electronics, Computer and Telecommunication Engineering

Sandia National Laboratories

University of Houston

Sandia National Laboratories California

University of Florence

National Research Council

University of Rome Tor Vergata

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Planar antenna for continuous beam scanning and broadside radiation by selective surface wave suppression

Electronics Letters (2010)

Symon K. Podilchak Yahia M. M. Antar A.P. Freundorfer Paolo Baccarelli Paolo Burghignoli

A printed leaky-wave antenna (LWA) based on a grating of concentric annular microstrip rings fed by a non-directive TM0 surface-wave launcher (SWL) is presented for two-sided continuous beam scanning and broadside radiation. By appropriate selection of the grating periodicity TE field distributions can be suppressed over a large bandwidth ensuring efficient TM0 leakage and radiation into the far field. Measured results demonstrate a pencil beam at broadside with a 3 dB beamwidth less than 6° at 17.9 GHz. The presented LWA may be useful for radar and surveillance systems where continuous beam scanning through broadside is desired.

Beamwidth

Broadside

Leaky wave antenna

Beam steering

Main lobe

Pencil (optics)

10.1049/el.2010.0074

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Citations (18)

3D Electromagnetic Crystals for antenna applications

Fabrizio Frezza Lara Pajewski Giuseppe Schettini S. Paulotto Cristina Ponti

Source

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Citations (0)

Modal Properties of Layered Metamaterials

CRC Press eBooks (2009)

Guido Valerio S. Paulotto Paolo Burghignoli Paolo Baccarelli Alessandro Galli

10.1201/9781420054262.ch13

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Citations (1)

A novel technique to eliminate the open stopband in 1-D periodic printed leaky-wave antennas

S. Paulotto Paolo Baccarelli Fabrizio Frezza David R. Jackson

In this paper we deal with the problem of the Open StopBand (OSB) in one-dimensional (1-D) periodic printed Leaky- Wave Antennas (LWAs). In particular, a LWA realized periodically loading a microstrip line with two open-ended stubs per unit cell is considered. The dispersion behaviour of this antenna is analyzed in order to show that a mitigation of the open-stopband effects can be achieved. Moreover, an optimization of its performances near broadside is discussed through a transmission line analysis, changing the distance between the two radiating stubs. Finally, a novel technique to completely eliminate the open stopband is presented. Numerical results for the dispersion behaviour and for the antenna gain are reported to validate both the optimization and the elimination of the OSB. (5 pages)

Stopband

Broadside

Leaky wave antenna

10.1049/ic.2007.1107

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Citations (4)

Efficient calculation of 1-D periodic Green's functions for leaky-wave applications

URSI International Symposium on Electromagnetic Theory (2010)

S. Paulotto Guido Valerio David R. Jackson Donald R. Wilton Paolo Baccarelli

In this paper an approach is described for the efficient computation of the mixed-potential scalar and dyadic Green's functions for a one-dimensional periodic (periodic along x direction) array of point sources embedded in a planar stratified structure. Suitable asymptotic extractions are performed on the slowly converging spectral series. The extracted terms are summed back through the Ewald method, modified and optimized to efficiently deal with all the different terms. The accelerated Green's functions allow for complex wavenumbers, and are thus suitable for application to leaky-wave antennas analysis. Suitable choices of the spectral integration paths are made in order to account for leakage effects and the proper/improper nature of the various space harmonics that form the 1-D periodic Green's function.

Wavenumber

Spectral leakage

Harmonic Analysis

Green's function

Green S

10.1109/ursi-emts.2010.5637089

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Citations (7)

Interpolation of Green's functions with 2D periodicity in layered media

Vladimir Volski Guy A. E. Vandenbosch Paolo Baccarelli Fabrizio Frezza Alessandro Galli

In this paper different approaches for the numerical calculation of Green's functions of printed structures with two-dimensional (2-D) periodicity are presented. Recurring to specific asymptotic extractions, several techniques can be used to improve the efficiency of the procedure for a specific geometry. Choices are possible among different asymptotic functions and/or different interpolation algorithms (bi-linear and B-splines). This work is the result of the cooperation between Katholieke Universiteit Leuven (KUL) and La Sapienza University of Rome (SAPIENZA) within the ACE (Antenna Centre of Excellence) integration project on large arrays. (7 pages)

Interpolation

Excellence

10.1049/ic.2007.1175

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Citations (5)

Computational aspects for the accurate and efficient analysis of periodic planar leaky-wave antennas

2022 16th European Conference on Antennas and Propagation (EuCAP) (2012)

Guido Valerio S. Paulotto David R. Jackson Donald R. Wilton Paolo Baccarelli

Design techniques for leaky-wave antennas usually require complex analysis methods for the rigorous characterization of the radiating structures as a function of the various geometrical and physical parameters involved. An increasing number of such antenna topologies are based on planar stratified configurations with suitable inclusions of periodic metallic or dielectric perturbations. The prediction of the leaky-wave parameters (i.e., phase and leakage constants, etc.) is a difficult task to achieve in an accurate and efficient fashion. In this connection, the present contribution is focused on the computational aspects related to an integral-equation approach to the problem based on a mixed-potential formulation. By means of specific asymptotic extractions, powerful acceleration techniques for the relevant scalar and dyadic Green's functions are proposed and tested for different types and dimensions of periodicity. Numerical results are provided and discussed for various significant types of periodic structures.

Leakage (economics)

10.1109/eucap.2012.6206662

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Citations (2)

Analysis of printed periodic structures on a grounded substrate: a new Brillouin dispersion diagram

IEEE MTT-S International Microwave Symposium digest (2005)

Paolo Baccarelli S. Paulotto David R. Jackson A.A. Oliner

In this work, the dispersion and radiation properties of bound and leaky modes on one-dimensional printed periodic structures (printed on a grounded dielectric slab) are investigated. It is shown that a new type of Brillouin diagram can be constructed to account for the different types of physical leakage, namely leakage into one or more surface waves or also simultaneously into space. This new Brillouin diagram provides physical insight into the behavior of the modes on one-dimensional periodic structures, and it also allows for a simple and convenient way to determine the paths of integration for the space harmonics, which arise in a spectral-domain moment-method solution of such structures. Numerical results are provided that show the advantage of using the new Brillouin diagram in explaining the leakage and stopband behavior for these kinds of periodic structures.

Brillouin zone

Stopband

Band diagram

Leakage (economics)

10.1109/mwsym.2005.1517110

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Citations (7)

Efficient Computation of 1-D Periodic Layered Mixed Potentials for the Analysis of Leaky-Wave Antennas With Vertical Elements

IEEE Transactions on Antennas and Propagation (2015)

Guido Valerio S. Paulotto Paolo Baccarelli David R. Jackson Donald R. Wilton

An efficient mixed-potential integral equation formulation is proposed for the analysis of one-dimensional (1-D) periodic leaky-wave antennas (LWAs) based on planar stratified configurations with inclusions of arbitrarily oriented metallic or dielectric perturbations. Both the transverse and vertical components of the mixed-potential Green's functions due to a 1-D phased array of dipoles in a layered medium are accelerated using suitable homogeneous-medium asymptotic extractions from the standard spectral series of Floquet harmonics. A novel acceleration procedure is applied for the computation of the vertical potentials whose extracted terms can be expressed as potentials from a 1-D phased array of half-line sources in a homogeneous medium. Their numerical calculation requires a suitable modification of the Ewald method, thus resulting in new modified spectral and spatial series, having Gaussian convergence even in the case of complex modes and improper harmonics. Numerical comparisons for the 1-D periodic potentials, both in the case of bounded and unbounded (e.g., leaky) harmonics, validate the efficiency and accuracy of the proposed acceleration technique. The method is illustrated and verified by determining the dispersion behavior of both bound and leaky modes for several LWA test cases.

Floquet theory

10.1109/tap.2015.2412959

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Citations (15)

Unimodal surface‐wave propagation in metamaterial nonradiative dielectric waveguides

Microwave and Optical Technology Letters (2006)

Paolo Baccarelli Paolo Burghignoli Fabrizio Frezza Alessandro Galli P. Lampariello

Abstract Nonradiative dielectric waveguides employing metamaterial media are studied with the aim of obtaining unimodal surface‐wave propagation for the operating low‐loss LSM 01 mode. Homogeneous isotropic ε ‐negative media are considered, with a plasma‐like frequency‐dependent relative permittivity. The use of such media allows for obtaining the desired unimodal propagation in suitable frequency ranges, provided that the metamaterial slab thickness and the metal‐plate spacing are sufficiently small. Parametric analyses are performed to determine the attainable frequency bandwidths. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2557–2560, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22000

Slab

10.1002/mop.22000

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Citations (7)