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Numerical Model-Augmented RF Test technique

M.Bandinelli, M.Bercigli, L.Scialaqua, L.J.Foged, F.Vipian, G.Giordanengo, M.Sabbadini, G.Vecchi

Abstract: This paper reports on the preliminary results in functional testing solutions for RF end-to-end antenna testing. The proposed approach is based on the intelligent and innovative use of existing measurement capabilities and advanced numerical modeling tools. The scope of the activity is to demonstrate through the implementation of a demonstrator and measurement on suitable hardware the possibility to achieve accurate and fast measurement results using a radical measurement under-sampling with respect to the conventional Nyquist criteria.

Published on European Conference on Antennas & Propagation (EuCAP2012)

http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6206375&contentType=Conference+Publications&queryText%3DNumerical+Model-Augmented+RF+Test+technique

Estimation Of The Electric Field Generated By Power Lines With The Adaptive Integral Method

A.Mori, P.De Vita, A. Freni

Abstract: The electric field generated by power lines is usually evaluated by a simple 2-D model. Due to the presence of buildings or other objects near the power line, measurements are often in disagreement with the model. In this letter, the adaptive integral method (AIM) is used to analyze a power line in a real environment. The presence of a conducting ground plane, as well as a planar dielectric interface, is also efficiently built into the algorithm.

Published on IEEE Trans. On POWER DELIVERY, Vol. 26, n°2, April 2011

http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=5686896&url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F61%2F5738430%2F05686896.pdf%3Farnumber%3D5686896

Antenna Design Framework: Solving the EDA Antinomy

G.Galgani, G.Guida, M.Sabbadini, M.Bandinelli, P.Di Bartolomeo

Abstract: Despite the high level of maturity, the development process of EDA tools for electromagnetic modelling appears to be hindered by a number of contradictions. Three of them have a strong impact on the quality and usability of the products. This paper tries to expound these antinomies and to propose a way out by describing the methodological approaches used in the development of Antenna Design Framework to give a positive solution to the challenges they pose.

Published on European Conference on Antennas & Propagation (EuCAP2011)

http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=5782171&url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F5771476%2F5780481%2F05782171.pdf%3Farnumber%3D5782171

Feed-Array Design in Presence of Strong Scattering From Reflectors

M.Bandinelli, F.Milani, G.Guida, M.Bercigli, P.E.Frandsen, S.B.Sorensen, B.Bencivenga, M.Sabbadini

Abstract: Full-wave reflectors antenna modelling, especially when fed by strongly-interacting radiating structures, e.g. arrays coming into the reflector field-of-view, can be a difficult task for a single tool, which is typically not able to manage multi-scale sub-problems. This communication addresses the feasibility of a procedure for the design of feed-arrays in presence of strong scattering from the reflector (or any other nearby structure). The particular and novel feature is how using the “best tool” for each part of the model is achieved by means of an effective communication mechanism based on the EDX language.

Published on European Conference on Antennas & Propagation (EuCAP2011)

http://ieeexplore.ieee.org/xpl/articleDetails.jsp?reload=true&arnumber=5782409&contentType=Conference+Publications

The Antenna Design Framework – Electromagnetic Satellite

M.Sabbadini, G.Guida, M.Bandinelli

Abstract: The Antenna Design Framework - Electromagnetic Satellite is an antenna design system offering a wide palette of modeling tools aimed at covering engineering needs from the early feasibility studies to the last performance-verification stages of flight hardware. A few key ideas have been central to its development, focusing on the overall engineering process rather than on individual modeling steps. This has led to a modeling architecture that offers a very high degree of modularity, scalability, and flexibility. Some practical examples are used in the discussion to illustrate these points.

Published on IEEE Antennas and Propagation Magazine, Vol. 51, N. 2, April 2009

http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=5162073&url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F74%2F5161998%2F05162073.pdf%3Farnumber%3D5162073

Hybrid MoM Approaches for High Fidelity and Effective Modeling in large Antenna Farm and Scattering Problems

M.Bercigli, F.Vipiana, P.De Vita, A.Mori, A.Freni, G.Vecchi, R.Guidi, M.Bandinelli

Abstract: The keyword in the actual panorama of large antenna farm and scattering problems modelling is ldquoaccuracyrdquo or, in other words, the concept of ldquohigh fidelity modellingrdquo, the only way to cut development and/or prototyping costs. The integral equation (IE) approach is typically used to manage antenna problems where the accuracy is a basic requirement, through the Method of Moment (IE-MoM) approach. It is well known, however, that standard MoM techniques are severely limited by the required computational efforts and condition numbers involved in the very electrically large and multi-scale problems usually of interest. In this communication the results of the application of Multi- resolution (MR) as physical based pre-conditioner on real-life large and multi-scale geometries in combinations whit MLFMA are presented.

Published on European Conference on Antennas & Propagation (EuCAP2009)

http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=5068039&url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F4977244%2F5067558%2F05068039.pdf%3Farnumber%3D5068039

Domain Decomposition and Wave Coupling by Using Complex Source Expansions

G.Carli, E.Martini, M.Bandinelli, S.Maci

Abstract: A general domain decomposition scheme based on the use of complex sources is presented for the analysis of electromagnetic interactions in complex environments. First, the original problem is divided into separated subdomains that are independently analyzed; then, the interactions among different subdomains are described through a generalized network formalism where the ports are associated with complex source point (CSP) beams. Due to the angular selectivity of the CSP beams, the subdomain interactions only involve a limited number of beams, thus, yielding a significant reduction in the computational cost for the solution of the overall problem. Numerical examples are provided to demonstrate the efficiency and the accuracy of the proposed strategy.

Published on European Conference on Antennas & Propagation (EuCAP2009)

http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=5068027&url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F4977244%2F5067558%2F05068027.pdf%3Farnumber%3D5068027

High-Fidelity Modelling Techniques for Antenna farm Analysis

F.Vipiana, G.Vecchi, S.Maci, A.Freni, M.Bercigli, M.Bandinelli, M.Sabbadini

Abstract: Current real-life designs involving antennas and EMC in antenna farm issues call for unprecedented levels of complexity, and require accurate, virtual-prototyping predictions, which are best obtained using cutting-edge modelling technology applied in a computational environment that offers a seamless workplace to the antenna engineer from CAD to design verification. Furthermore as predicted results are increasingly used to replace costly tests on hardware models the issue of fidelity becomes more and more important. The new baseline full-wave modelling being developed for ADF-EMS is based on the existing MoM capabilities with the inclusion of: 1) Fast Multiple Method (FMM), both in its single- and multi-level (MLFMA) implementations; 2) Multi-resolution (MR) hierarchic basis functions. The FMM/MLFMA is arguably the most proven and efficient approach for large problems; being an iterative method, the issue of convergence is of paramount importance especially in the presence of geometrical (structural) complexities. In this regard, the MR is a technique that allows a tight control of the conditioning of the MoM matrix in complex environments. Separately and in combinations, these techniques allow stable, fast and accurate solutions for complex problems with minimal intervention on the part of the user. At the same time ADF-EMS offers PO/ITD and UTD capabilities allowing the selection of the best modelling strategy for different aspects of a same problem. One specific problem of antenna farm modelling is the virtually unbounded error toward low field levels. Often predictions show deep nulls in the field that are seldom observed in reality and are due to the assumption of perfect specular reflections on the satellite body.

Published on 30th ESA ANTENNA WORKSHOP, Noordwijk, The Netherland, 27-30 May, 2008

For more information on this paper, please contact us at This email address is being protected from spambots. You need JavaScript enabled to view it.

 

Source Modelling and Pattern Enhancement for Antenna Farm Analysis

F.Mioc, J.Araque Quijano, G.Vecchi, E.Martini, F.Milani, R.Guidi, L.Foged, M.Sabbadini

Abstract: One of the typical problems of antenna farm analysis is the characterisation of the source antennas. Two typical approaches are followed and are both available within EAML: use of the antenna pattern (sampled on as Spherical Wave Expansion) and use of equivalent currents on a suitable equivalence surface. In both cases the main issue is to obtain an accurate and suitable model from simulated or measured data, which are intrinsically associated to different boundary conditions that those seen by the antenna installed on the platform. A typical example is that of a small antenna measured in "free" space that is installed on a rather large ground plane. Several approaches have been developed during the EAML study to overcome these problems.

Published on 30th ESA ANTENNA WORKSHOP, Noordwijk, The Netherland, 27-30 May, 2008

For more information on this paper, please contact us at This email address is being protected from spambots. You need JavaScript enabled to view it.

 

Description of Complex Electromagnetic Environment by using Beam Scattering Matrices

G.Carli, E.Martini, M.Bandinelli, S.Maci

Abstract: Current real-life designs involving antennas and EMC in antenna farm issues call for unprecedented levels of complexity, and require accurate, virtual-prototyping predictions, which are best obtained using cutting-edge modelling technology applied in a computational environment that offers a seamless workplace to the antenna engineer from CAD to design verification. Furthermore as predicted results are increasingly used to replace costly tests on hardware models the issue of fidelity becomes more and more important. The new baseline full-wave modelling being developed for ADF-EMS is based on the existing MoM capabilities with the inclusion of: 1) Fast Multiple Method (FMM), both in its single- and multi-level (MLFMA) implementations; 2) Multi-resolution (MR) hierarchic basis functions. The FMM/MLFMA is arguably the most proven and efficient approach for large problems; being an iterative method, the issue of convergence is of paramount importance especially in the presence of geometrical (structural) complexities. In this regard, the MR is a technique that allows a tight control of the conditioning of the MoM matrix in complex environments. Separately and in combinations, these techniques allow stable, fast and accurate solutions for complex problems with minimal intervention on the part of the user. At the same time ADF-EMS offers PO/ITD and UTD capabilities allowing the selection of the best modelling strategy for different aspects of a same problem. One specific problem of antenna farm modelling is the virtually unbounded error toward low field levels. Often predictions show deep nulls in the field that are seldom observed in reality and are due to the assumption of perfect specular reflections on the satellite body.

Published on 30th ESA ANTENNA WORKSHOP, Noordwijk, The Netherland, 27-30 May, 2008

For more information on this paper, please contact us at This email address is being protected from spambots. You need JavaScript enabled to view it.