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Experimental Validation of an OCT Based Modelling Tool Integrated Into an Electromagnetic Simulator Framework

M.Bandinelli, G.Galgani, G.Guida, V.Martorelli, A.Sarri

Abstract: This paper discusses the integration of the Oversized Cavity Theory (OCT) for radiated emission and susceptibility analysis (RE/RS) into a commercial simulation framework named Antenna Design Framework - Electromagnetic Satellite (ADF-EMS), which includes standard modelling methods such ad MOM, PO and GTD for the analysis of electromagnetic problems and antenna farms. The paper also presents the outcome of a measurement campaign aimed at assessing the efficacy of the method and its limitation when used to perform RE/RS analysis of a satellite communication module.

Published on ESA WORKSHOP on AEROSPACE, Venezia, Italy, May 21 – 23, 2012

Assessment of electromagnetic fields inside the Communication Module of a Telecom Satellite

D.Birrek, G.Guida, D.Marley, F.Marliani, S.Marra, V.Martorelli

Abstract: The paper describes the evaluation of the internal electromagnetic fields in overmoded regime inside the telecommunications satellite SGEO. The sources taken into account are the leakages due to both the internal high power transmit chains and the external antennas fields coupled to the internal cavities by means of the numerous apertures present in the satellite skin. The evaluation of the antenna fields has been performed using the GTD and the PTD modules of Antenna Design Framework - Electromagnetic Satellite (ADF-EMS). The internal field computation has been performed with IDSOCT, a code integrated in ADF-EMS based on the Oversized Cavity Theory (OCT). All the transfer functions between sources and internal fields have been computed for easier evaluation of possible mitigations.

Published on ESA WORKSHOP on AEROSPACE, Venezia, Italy, May 21 – 23, 2012

Experimental Results of Plasma Induced EMI Effects in a reflector Antenna System.

M.Bandinelli, L.Pandolfo, A.Fittipaldi, A.Sarri

Abstract: This paper presents measurement results of the electromagnetic interference (EMI) caused by the plasma plume of ion thrusters firing through the RF beam of reflector antennas. The EMI effect consists mainly in the introduction of discrete spurious modulation products on the RF carrier thus degrading spectral purity. The measurements were carried out on a mockup which is geometrically representative of the actual SGEO spacecraft design. The mockup and the acquisition system were specifically designed to allow RF measurements inside a metallic vacuum chamber. Three ion thrusters were characterised during the test campaign: SPT-100, HEMP-T, PPS-1350.

Published on ESA WORKSHOP on EMC AEROSPACE, Venezia, Italy, May 21 – 23, 2012

Electromagnetic Modelling of Antennas Radiating in Complex Scenarios

G.Guida, M.Sabbadini, F.Marliani

Abstract: The paper discusses the electromagnetic modelling of antennas mounted on platforms, for space applications, entirely or partially surrounded by complex media. Also the methodological issues related to the integration of advanced numerical techniques in a commercial simulation framework are discussed.

Published on European Conference on Antennas & Propagation (EuCAP2012)

An OCT Based Modeling Tool to Fast Evaluate Statistical E.M. Field Distribution Inside Enclosure-Like Environments

.Martorelli, J.Kazik, G.Galgani, F.Milani, R.Guidi

Abstract: This paper contains the description of a modeling procedure based on the Oversized Cavity Theory that provides a statistical description of the electric field inside large structure when a high number of modes are excited. In the IDSOCT a graphic user interface allows users to build the model providing a set of specific companion tools to manage complex scenarios: a fast modeler of apertures, a FD-TLM method for periodic structures, a data library to store the frequency characterization of materials and other properties.

Published on ICEAA 2011 International Conference on Electromagnetics in Advanced Applications, Torino, Italy, 12-16 September, 2011

A Customized measurement System for the assessment of Electromagnetic Interference caused by Plasma Plumes

A.Sarri, R.Cioni, D.A.Fittipaldi, F.Marliani

Abstract: This paper presents a customized measurement system for the assessment of the electromagnetic interference caused by plasma plumes, mainly in terms of spurious modulation effects, generated by the plasma channel saturation and depletion, and related effects on noise and inter-modulations. The goal of the experiments is to obtain a comprehensive set of experimental data to validate and complement theoretical and prediction data about plasma plume-induced modulation phenomena.

Published on European Conference on Antennas & Propagation (EuCAP2010)