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An efficient technique to provide fast and accurate analysis of wideband surrounded antennas mounted on electrically large platforms is presented and validated in this paper. The hybrid method combines dual-grid finite-difference time domain (DG-FDTD) with iterative physical optics (IPO) to analyze on-platform antenna radiation. In refid="sec4"Section IV of this paper, DG-FDTD/IPO is applied to the analysis of a wideband antenna mounted on a vehicle. The ability to address the problem of antenna placement is also demonstrated. [ABSTRACT FROM PUBLISHER]

This work is dedicated to the assessment of the filtering performances of an optoelectronic sensor for space applications. Particular care is taken concerning the power supply subsystem (here voltage shifter integrated circuit), which is part of the electromagnetic compatibility (EMC) compliance of an imaging equipment embedded on spacecrafts. The proposed methodology aims at two major targets: First, evaluating the Filter Effectiveness (FE) subject concerning varying parameters (including filter topology, parasitic effects and source/load impedance variations); second, quantifying the relative importance of representative equivalent electrical components through sensitivity analyses (nominal and parasitic values). The latter point is of utmost importance considering the expected versatility of such systems, such as manufacturing tolerances, for instance. Nominal values and/or components are often badly defined for confidentiality reasons, lack of knowledge or pure ignorance of inputs. An analytical deterministic formulation (here through the transfer matrix approach) is proposed and completed with an original stochastic strategy (Reduced Order Clustering, ROC). This ensures the reliable assessment of both statistical filter performances and most influential parameters, jointly with computational resources saving relatively to brute force Monte Carlo simulations. [ABSTRACT FROM AUTHOR]