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Dive into the research topics where E. Di Giampaolo is active.

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Featured researches published by E. Di Giampaolo.


ieee antennas and propagation society international symposium | 2006

High frequency numerical modelling using measured sources

L. J. Foged; F. Mioc; B. Bencivenga; E. Di Giampaolo; M. Sabbadini

SatSIM has proved an efficient extension to the fast measurement capabilities of the SATIMO family of antenna measurements systems. The SatSIM code provides a user-friendly and economical way to accurately evaluate the behaviour of an antenna in its final operational environment based on near field measurements of the isolated real antenna and numerical modelling of the environment. In this paper, the SatSIM algorithm has been tested and validated using small source antennas in different positions on a scaled model of a complete satellite including solar panels and reflectors. Although the development and validation of the algorithm has been performed under an ESA contract specifically for accommodation analyses of spacecraft antennas, the powerful combination of antenna testing and simulation in a single environment also has strong potentials in other related fields


ieee antennas and propagation society international symposium | 2010

Infinite ground plane antenna characterization from limited groundplane measurements

L. J. Foged; F. Mioc; B. Bencivenga; M. Sabbadini; E. Di Giampaolo

The accurate measurement of the infinite ground plane antenna patterns are needed in different applications as discussed in [1–11]. The infinite ground plane condition is difficult to measure on a general antenna due to the finite dimensions of the measurement systems. In spherical near field measurement systems the measured antenna field is described completely by the spherical wave spectrum determined by a near field to farfield transformation [12, 13]. To recover the spherical wave spectrum of the finite ground plane source as if it was placed on an infinite ground plane the field scattered by the finite ground plane edges has to be removed.


ieee antennas and propagation society international symposium | 2005

GTD ray tracing by topological mapping

E. Di Giampaolo; Fernando Bardati

High frequency methods resort to numerical ray tracing for application to complex environments. A new method based on the visibility map in a topological space has been developed as a preconditioning of the ray tracing procedure. The method allows reflected and diffracted contributions in a scene to be handled with an off-line electromagnetic field calculation. Some examples are provided showing the efficiency of the method


ieee antennas and propagation society international symposium | 2001

A method for multiple diffracted ray sampling in forward ray tracing

E. Di Giampaolo; Fernando Bardati

An analytical method for determining the diffraction points in ray tracing is proposed. The general case of diffraction by oblique straight wedges in 3D is considered. The sampling problem is solved for a first order diffracted ray congruence in such a way to provide a suitable sampling of the rays diffracted by a second wedge. The method can be extended to the sampling of higher-order diffracted rays. An example is provided for a couple of orthogonal edges lighted by a point source.


ieee antennas and propagation society international symposium | 2009

Computationally efficient tool using UTD on detailed meshed geometries

B. Bencivenga; F. Mioc; L. J. Foged; M. Sabbadini; S. Filippone; E. Di Giampaolo

The tool has been tested on several scenes with increasing complexity and the corresponding computational cost has been evaluated, confirming the expected speed and accuracy. The extensive testing has also shown that a deeper optimization of the code can further increase its performances. Improvements are expected by compressing the Beam Output File. While changes to the geometry data structure and to the algorithm for the generation of the beam-tree are being explored to enable the efficient handling of even larger structures as well as an even more effective field calculation scheme.


ieee antennas and propagation society international symposium | 2006

A combined technique ABT-MOM for on board analysis of TT&C antennas

E. Di Giampaolo; Piero Tognolatti

A combined method-of-moment-astigmatic-beam-tracing (MOM-ABT) scheme is proposed for the electromagnetic field analysis of an on-board antenna. The method resorts to a vector spherical wave expansion to link the MOM code to the ABT code. This approach exploits the ability of full wave computation to treat detailed models of the antenna and its nearby structures while ABT is able to perform the analysis of the satellite environment. As an example of the proposed approach, the analysis of the interactions of Galileo satellite TT&C antenna with spacecraft is carried out


ieee antennas and propagation society international symposium | 2004

A deterministic tool for multipath propagation modelling

E. Di Giampaolo; Fernando Bardati

Mobile communications are influenced by multipath effects. Radio wave propagation over urban and natural terrain depends on topography and morphography. A simulation tool, URBES (urban ray beam electromagnetic simulator), is presented. It is based on astigmatic beam tracing (ABT), a deterministic method which combines ray and beam tracing. ABT can handle multiple reflections and diffractions in 3D using GO and UTD. The tool has been applied to models of different scenarios, including urban and natural terrain scenarios. Some preliminary results of a validation activity are presented, showing a fair agreement with published measurements and results of other methods.


ieee antennas and propagation society international symposium | 2002

Performance evaluation of astigmatic beam tracing in the application to picocell scenarios

E. Di Giampaolo; Fernando Bardati; M. Sabbadini

In wireless communication networks planning determinisfic propagation fools based on ray tracing have been widely developed and used. Astigmatic Beam Tracing, a novel technique recently developed, can overcome some drawbacks of ordinaty ray tracing. A numerical code has been developed to implement ABT and has been applied fo a model of urban scenario with increasing complexity. The results of a numerical analysis are discussed to evaluate the relevance of test case sizes on the computational charge. Introduction Accurate methods for electromagnetic field prediction in complex environments such as urbadindoor scenarios are of great interest for wireless communications. 3D raytracers are used for field prediction, however they require site-specific information and use specialised algorithms to trace the rays for any particular environment. Any ray-tracing-based technique has to cope with two main requirements, to achieve accurate field predictions and to improve computational time efficiency. The overall accuracy depends on the amount of details in the scene that a ray tracer is able to handle, as well as on the algorithms in use for ray tracing. Time efficiency depends on both the desired accuracy in field calculation and the algorithms in use. Most electromagnetic ray-tracing tools (especially for urban propagation) are able to handle polyhedral objects. A large number of ray tracers have been proposed for different applications. Those based on the visibility theory are well suited for electromagnetic propagation studies as they can keep low the loss of contributions [1][2] [3]. In a geometric context, two objects are visible to each other if there is a straight line connecting them that does not cross any obstacle. Any ray tracer exploits its own visibility algorithm for ray path determination. A local visibility test involves only one ray or a few rays at a time. It is possible, however, to organise the visibility computation in a global manner, in the sense that any area-to-area (or source-to-area) visibility test is performed in the presence of all the obstacles. This normally reduces ray-tracing computation times. In fact, once a global visibility recognition has been accomplished, it is not necessary to check for obstructions for any ray interacting with visible entities. In a previous work [ 11 we developed the Astigmatic Beam Tracer (ABT) as a tracer based on the global visibility. In principle ABT is able to take all possible contributions in an environment with polyhedral objects into account. ABT has been designed for handling wedge diffraction to any order in addition to reflection and transmission. It ensures a continuous and complete coverage of the scenario exploiting ray beams to propagate wavefronts radiated by primary and secondary sources. In this paper we investigate the feasibility of the ABT scheme, analysing advantages and drawbacks. A numerical code has been implemented and examples of application 354 @7803-733@WOz


european conference on antennas and propagation | 2010

RFID-network planning by Particle Swarm Optimization

E. Di Giampaolo; F. Fornì; Gaetano Marrocco

17.00 0 2oMIEEE to moderately large environments have been performed. In this paper, some results obtained with ABT are reported with preliminary statistical considerations. ABT scheme The key idea behind ABT is to pre-compute and store spatial data structures that encode all possible reflection and diffraction paths from a source. Then these data structures are exploited for electromagnetic field computations. The global visibility test is the task of a pre-processing step that has to be made only once for a given scenario. It makes available a database (or a graph) that stores information on the visibility between any couple of entities (faces and wedges) in the environment. For determining 3D ray paths a real 3D vector database is used. The computation is partitioned into three distinct phases. Two phases are pre-processing steps to be executed off-line (spatial subdivision and beam tracing), while the last one (ray path generation) is executed under a user’s control (Fig. I). In greater detail: Spatial subdivision Spatial relationships (including adjacency) for the set of polygons describing the objects in the environment are pre-computed and stored. This phase is useful to accelerate beam tracing in the following phase. Data are stored and can be saved for further calculations.


european conference on antennas and propagation | 2009

An accurate and computationally efficient tool using UTD on large meshed geometries

B. Bencivenga; F. Mioc; L. J. Foged; M. Sabbadini; S. Filippone; E. Di Giampaolo

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M. Sabbadini

European Space Research and Technology Centre

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Fernando Bardati

University of Rome Tor Vergata

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S. Filippone

Instituto Politécnico Nacional

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Gaetano Marrocco

University of Rome Tor Vergata

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F. Fornì

Instituto Politécnico Nacional

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