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Recent use of measured data as near field sources in Computational Electro Magnetic (CEM) tools has opened the possibility to represent antennas in numerical simulations, even when the antenna characteristics and geometry are unknown and therefore cannot be included in a full wave model [1-4]. The near field source consists of an equivalent current representation of the antenna, which is prepared...
In spherical Near Field (NF) measurements post-processing techniques based on spatial filtering have been presented as promising tools for the mitigation of echoes or stray signals deriving from the surrounding environment. The spatial filtering is very efficient in measurement scenarios with a stationary Antenna Under Test (AUT). Whenever the AUT is rotating, in order to increase the effectiveness...
Automotive antenna measurements are increasingly demanding. Modern cars are equipped with a large number of integrated antennas, spanning a wide frequency range for a large number of applications. Integrated antennas are strongly coupled with the structure, final testing are thus performed on the vehicle to accurately determine the performance. The physical and electrical size of typical cars, impose...
Integration of antenna measurements in numerical simulations, based on the equivalent current technique, has been validated in previous activities [1–8]. A link, enabling the export of an accurate numerical model, derived from the measured antenna pattern, to a number of commercial Computational Electromagnetic (CEM) solvers has been created and validated [9–14]. The equivalent current processing...
Accurate numerical models of a given antenna can be derived from measurements using the inverse source technique [1–3]. Using this technique, measured antenna patterns can currently be imported and used as numerical sources in a number of commercial Computational Electromagnetic (CEM) solvers [4–9]. This method has been validated experimentally and the achievable accuracy investigated for both stand-alone...
This paper presents the application to satellite antenna modelling of a common format for the exchange of geometry and associated data. The EDX development has been a core activity of the EAML team in collaboration with the Working Group on Software of the European Association on Antennas and Propagation (EurAAP). The implementation of the Structures Data Dictionary in Data Dictionary Language is...
Electromagnetic models of measured antenna can be accurately computed by the inverse source technique, implemented in the MVG software INSIGHT [1–5]. The measurement processing is based on the expansion of the measured field using equivalent currents [7–10]. A recently created link enable the INSIGHT to export the electromagnetic model to a number of commercial Computational Electromagnetic (CEM)...
Spherical Near Field (NF) measurements are widely used in order to accurately characterize the radiating performance of antennas. The main drawback of this type of measurement is the acquisition time that, depending on the electrical size of the Antenna Under Test (AUT), could be very long. This is due to the fact that, in order to correctly evaluate the Far Field (FF) with the NF/FF transformation...
Computational Electromagnetics (CEM) solvers are important engineering tools in the characterization and optimization of antenna placement on large and complex platforms. The accuracy of the source representation has a strong influence on the simulation accuracy of such antenna systems. It is customary to use domain decomposition technique based on the near field description of the local domain in...
Inverse source or equivalent current/source method (EQC) provides an accurate near-field representation of any radiating device in terms of equivalent electric and magnetic currents [1–4]. Starting from measured near or far field data in any measurement configuration, this technique allows to determine an accurate 3D electromagnetic model, maintaining the near field (NF) and far field (FF) properties...
Accurate electromagnetic models of measured antennas are available from the expansion of the measured field using equivalent currents [1–4]. The constructed model is importable in commercial Computational Electromagnetic (CEM) solvers in the form of a Huygens Box [5–9]. In flushmounted antenna applications, the measurement of the antenna sited in a locally relevant scenario and subsequent data processing...
Placement analysis in complex antenna scenarios require accurate computational electromagnetic (CEM) tools. A fundamental requirement to achieve truthful results, is that the source antenna must be accurately modelled. However, in many practical cases, a full-wave representation of the physical antenna is unfeasible or unavailable in the format required by the desired CEM solver. This paper describes...
Electromagnetic analysis of antennas in complex scenarios require accurate numerical modelling solvers. A fundamental requirement to achieve truthful results is the accurate representation/modelling of the source antenna. However, in many practical cases a full-wave representation of the physical antenna is either unfeasible or unavailable in the format required by the desired computational electromagnetic...
This paper presents the proposal for a common format for the exchange of geometry and associated data for e.m modelling. The EDX development is a core activity of the EAML team in collaboration with the Working Group on Software of the European Association on Antennas and Propagation (EurAAP). The proposal for a Structures Data Dictionary covers not only geometry but all information necessary to describe...
The paper presents the latest developments in the Electromagnetic Data Exchange (EDX). The EDX is a core activity of the EAML team in collaboration with the Working Group on Software of the European Association on Antennas and Propagation (EurAAP). The proposal for a common format for the exchange of mesh-related data is discussed together with an EDX example of meshed structures exchange including...
The inverse source or equivalent current/source method (EQC), [1]–[7], based on discretization of integral equations has attracted considerable attention due to a host of promising applications in antenna design and diagnostics. This method offers a greater generality and flexibility since it allows reconstructing sources on arbitrary 3-D surfaces enclosing the antenna under test (AUT). Indeed the...
This paper reports the findings of a comparative investigation of two versatile echo suppression techniques applicable to general antenna near field measurement scenarios with echoes of unknown origin. Both techniques are based on spatial filtering of the measured field taking advantage of the apriori knowledge of the antenna size and can be applied to near field measurements in any canonical scan...
This paper gives an overview of the ongoing activities in the frame of the EurAPP [1] working group on antennas measurements and the first considerations on useful criteria for comparing and evaluating large amount of measured antenna data. This work comes from the experience acquired during the VI EU Framework network “Antenna Centre of Excellence (ACE) [2]” as reported in [3–9]. During that project,...
This paper presents a comparative investigation of two versatile error-mitigation techniques, applicable to general antenna near-field measurement scenarios with echo signals of unknown origin. Both techniques are based on spatial filtering of the measured field, taking advantage of a priori knowledge of the antenna's size. The first approach takes advantage of the spatial-filtering properties of...
This communication presents promising applications of the integral equation formulation of the inverse source problem. The technique is based on the extraction of equivalent sources on a 3-D closed surface enclosing the Antenna Under Test (AUT) from near or far field measured radiation patterns upon rigorous application of the equivalence principle. Such sources allow malfunction detection and design...
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