Matteo Albani - Academia.edu (original) (raw)

Papers by Matteo Albani

This paper reviews some novel metasurfaces for applications in various antenna systems. The metam... more This paper reviews some novel metasurfaces for applications in various antenna systems. The metamaterial technology investigated in this work can also find applications in both high and low frequency communications systems. The benefits of implementing this technology include (a) the ability to achieve high directivity, (b) the realization of low profile antennas using Partially Reflecting Surfaces (PRS), and (c) the

IEEE Antennas and Propagation Society International Symposium. Transmitting Waves of Progress to the Next Millennium. 2000 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.00CH37118), 2000

The electromagnetic modeling of large finite arrays as well as the scattering by finite periodic ... more The electromagnetic modeling of large finite arrays as well as the scattering by finite periodic structures is an important topic for a large variety of engineering applications. A new method for the analysis of large periodic arrays, referred to as truncated Floquet wave full-wave (T(FW)2), has been proposed. This method is based on the solution of an appropriate integral equation in which the unknown function is the difference between the exact current distribution of the finite array and that of the infinite array, that realizes the periodic continuation of the actual one. In phased array antennas, the global phase tapering is typically linear but the global amplitude is not necessarily uniform. In this paper, the T(FW)2 analysis is generalized to large arrays with a tapered amplitude excitation. Numerical results are shown in order to demonstrate the extreme accuracy and the numerical efficiency of the presented technique

2014 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium), 2014

2014 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium), 2014

2011 XXXth URSI General Assembly and Scientific Symposium, 2011

We investigate the optical properties of metamaterials formed by collections of three-dimensional... more We investigate the optical properties of metamaterials formed by collections of three-dimensional clusters of plasmonic nanoparticles. This type of nanoclusters (NCs) consist of spherical constellations of metallic nanospheres arranged around a central dielectric sphere and support collective plasmon modes among which the most relevant are those associated with the induced electric and magnetic dipole resonances. We discuss the effective electric and magnetic polarizabilities of NCs, emphasizing their isotropic properties, and we show that dense packed arrays of NCs can be used to realize metamaterials with negative effective permittivity and permeability, and even negative effective refractive index at visible frequencies.

2007 Loughborough Antennas and Propagation Conference, 2007

ABSTRACT

2005 IEEE Antennas and Propagation Society International Symposium, 2005

A superstrate of an EBG material (or equivalently a Fabry-Perot cavity) is used to design array a... more A superstrate of an EBG material (or equivalently a Fabry-Perot cavity) is used to design array antennas with large distance between the radiating elements. This configuration provides some advantages: (i) a reduction of the number of array elements to achieve high directivity; (ii) large space between contiguous elements decreases their coupling and permits an easy arrangement for a complicated feeding

2014 IEEE Conference on Antenna Measurements & Applications (CAMA), 2014

2013 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium), 2013

ABSTRACT form only given. We consider an experimental validation of the accuracy of the recently ... more ABSTRACT form only given. We consider an experimental validation of the accuracy of the recently developed UTD third order diffraction coefficient. Consider three wedges that are aligned and that are illuminated at grazing incident by a plane wave. It is known that the field scattered by such geometrical configuration cannot be accurately described by ray-fields and, therefore, the scattered field cannot be accurately computed by cascaded product of three single wedge (first order) diffraction coefficients (S.-W. Lee, Y. Rahmat-Samii, R. Menendez, “GTD, ray field, and comments on two papers,” IEEE Transactions on Antennas and Propagation, vol.26(2) pp. 352354, Mar 1978). In 1997, Albani et al. (M. Albani, F. Capolino, S. Maci, and R. Tiberio, “Diffraction at a thick screen including corrugations on the top face,” IEEE Transactions on Antennas and Propagation, vol.45(2), pp.277-283, Feb 1997) developed a double wedge (second order) diffraction coefficient and one experimental validation of its accuracy was given by Erricolo in (D. Erricolo, “Experimental validation of second order diffraction coefficients for computation of path-loss past buildings,” IEEE Transactions on Electromagnetic Compatibility, Vol. 44, No. 1, Feb. 2002, pp. 272-273). In 2012, Carluccio et al. (G. Carluccio, F. Puggelli, M. Albani, “A UTD Triple Diffraction Coefficient for Straight Wedges in Arbitrary Configuration,” IEEE Transactions on Antennas and Propagation, vol.60(12), pp.5809-5817, Dec. 2012) developed a triple wedge (third order) diffraction coefficient. The purpose of this work is to measure the field scattered by geometrical configurations of objects involving three edges and compare the measurement results with the scattered field computed using the recently developed third order UTD diffraction coefficient. The measurements will be performed in the anechoic room of the Andrew Electromagnetics Laboratory of the Universi- y of Illinois at Chicago using various copper obstacles representing wedges in various spatial configurations. Numerical results will be presented during the conference.

2014 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium), 2014

An adaptive algorithm for the computation of the Physical Optics field scattered by a NURBS surfa... more An adaptive algorithm for the computation of the Physical Optics field scattered by a NURBS surface is presented. An adaptive meshing algorithm for the parametric domain of integration is described. This leads to an improvement of the efficiency when computing the scattered field. Different degrees of approximation for the phase function of the integrand are considered: constant, linear and quadratic phase approximation. A comparison between the procedures proposed is reported.

In this paper, a line integral representation is presented for the Physical Optics (PO) radiation... more In this paper, a line integral representation is presented for the Physical Optics (PO) radiation integral describing the scattering from an aperture in a black screen or by a flat perfectly conducting plate, illuminated by an elementary electric or magnetic dipole. The main application of this result deals with the acceleration of the PO numerical evaluation for electrically large objects, which can also be easily used

This paper reviews some novel metasurfaces for applications in various antenna systems. The metam... more This paper reviews some novel metasurfaces for applications in various antenna systems. The metamaterial technology investigated in this work can also find applications in both high and low frequency communications systems. The benefits of implementing this technology include (a) the ability to achieve high directivity, (b) the realization of low profile antennas using Partially Reflecting Surfaces (PRS), and (c) the

IEEE Antennas and Propagation Society International Symposium. Transmitting Waves of Progress to the Next Millennium. 2000 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.00CH37118), 2000

The electromagnetic modeling of large finite arrays as well as the scattering by finite periodic ... more The electromagnetic modeling of large finite arrays as well as the scattering by finite periodic structures is an important topic for a large variety of engineering applications. A new method for the analysis of large periodic arrays, referred to as truncated Floquet wave full-wave (T(FW)2), has been proposed. This method is based on the solution of an appropriate integral equation in which the unknown function is the difference between the exact current distribution of the finite array and that of the infinite array, that realizes the periodic continuation of the actual one. In phased array antennas, the global phase tapering is typically linear but the global amplitude is not necessarily uniform. In this paper, the T(FW)2 analysis is generalized to large arrays with a tapered amplitude excitation. Numerical results are shown in order to demonstrate the extreme accuracy and the numerical efficiency of the presented technique

2014 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium), 2014

2014 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium), 2014

2011 XXXth URSI General Assembly and Scientific Symposium, 2011

We investigate the optical properties of metamaterials formed by collections of three-dimensional... more We investigate the optical properties of metamaterials formed by collections of three-dimensional clusters of plasmonic nanoparticles. This type of nanoclusters (NCs) consist of spherical constellations of metallic nanospheres arranged around a central dielectric sphere and support collective plasmon modes among which the most relevant are those associated with the induced electric and magnetic dipole resonances. We discuss the effective electric and magnetic polarizabilities of NCs, emphasizing their isotropic properties, and we show that dense packed arrays of NCs can be used to realize metamaterials with negative effective permittivity and permeability, and even negative effective refractive index at visible frequencies.

2007 Loughborough Antennas and Propagation Conference, 2007

ABSTRACT

2005 IEEE Antennas and Propagation Society International Symposium, 2005

A superstrate of an EBG material (or equivalently a Fabry-Perot cavity) is used to design array a... more A superstrate of an EBG material (or equivalently a Fabry-Perot cavity) is used to design array antennas with large distance between the radiating elements. This configuration provides some advantages: (i) a reduction of the number of array elements to achieve high directivity; (ii) large space between contiguous elements decreases their coupling and permits an easy arrangement for a complicated feeding

2014 IEEE Conference on Antenna Measurements & Applications (CAMA), 2014

2013 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium), 2013

ABSTRACT form only given. We consider an experimental validation of the accuracy of the recently ... more ABSTRACT form only given. We consider an experimental validation of the accuracy of the recently developed UTD third order diffraction coefficient. Consider three wedges that are aligned and that are illuminated at grazing incident by a plane wave. It is known that the field scattered by such geometrical configuration cannot be accurately described by ray-fields and, therefore, the scattered field cannot be accurately computed by cascaded product of three single wedge (first order) diffraction coefficients (S.-W. Lee, Y. Rahmat-Samii, R. Menendez, “GTD, ray field, and comments on two papers,” IEEE Transactions on Antennas and Propagation, vol.26(2) pp. 352354, Mar 1978). In 1997, Albani et al. (M. Albani, F. Capolino, S. Maci, and R. Tiberio, “Diffraction at a thick screen including corrugations on the top face,” IEEE Transactions on Antennas and Propagation, vol.45(2), pp.277-283, Feb 1997) developed a double wedge (second order) diffraction coefficient and one experimental validation of its accuracy was given by Erricolo in (D. Erricolo, “Experimental validation of second order diffraction coefficients for computation of path-loss past buildings,” IEEE Transactions on Electromagnetic Compatibility, Vol. 44, No. 1, Feb. 2002, pp. 272-273). In 2012, Carluccio et al. (G. Carluccio, F. Puggelli, M. Albani, “A UTD Triple Diffraction Coefficient for Straight Wedges in Arbitrary Configuration,” IEEE Transactions on Antennas and Propagation, vol.60(12), pp.5809-5817, Dec. 2012) developed a triple wedge (third order) diffraction coefficient. The purpose of this work is to measure the field scattered by geometrical configurations of objects involving three edges and compare the measurement results with the scattered field computed using the recently developed third order UTD diffraction coefficient. The measurements will be performed in the anechoic room of the Andrew Electromagnetics Laboratory of the Universi- y of Illinois at Chicago using various copper obstacles representing wedges in various spatial configurations. Numerical results will be presented during the conference.

2014 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium), 2014

An adaptive algorithm for the computation of the Physical Optics field scattered by a NURBS surfa... more An adaptive algorithm for the computation of the Physical Optics field scattered by a NURBS surface is presented. An adaptive meshing algorithm for the parametric domain of integration is described. This leads to an improvement of the efficiency when computing the scattered field. Different degrees of approximation for the phase function of the integrand are considered: constant, linear and quadratic phase approximation. A comparison between the procedures proposed is reported.

In this paper, a line integral representation is presented for the Physical Optics (PO) radiation... more In this paper, a line integral representation is presented for the Physical Optics (PO) radiation integral describing the scattering from an aperture in a black screen or by a flat perfectly conducting plate, illuminated by an elementary electric or magnetic dipole. The main application of this result deals with the acceleration of the PO numerical evaluation for electrically large objects, which can also be easily used