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A partitioned MoM scheme is suggested for electromagnetically treating assembles of geometries having a substantial common part. This scheme is applied to compare and optimize characteristics of various antennas installed on airplane surface. The effectiveness of the suggested scheme to sufficiently decrease CPU time is demonstrated. The perspectives of the new scheme for solution of various EM and EMC problems in vehicle design are outlined.

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This paper describes the application of ACA (Adaptive Cross Approximation) algorithm for acceleration of MoM solution of large scale radiation problems. System of linear equations is solved using iterative solution and ACA is used to reduce required memory for matrix storage and speed up matrix-vector-product operation. To demonstrate applicability and performance of described technique, two numerical experiments are presented: a) calculation of radiation pattern of Magellan spacecraft high gain reflector antenna operating at 3GHz and b) calculation of radiation pattern of Wi-Fi antenna mounted on the roof of the vehicle, operating at 5.9GHz frequency. We show that ACA calculation is much faster than direct solution, while accuracy is quite acceptable.