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Computer Simulation and Numerical EM Simulation

EM simulation plays an important role in EM compatibility testing because of the highly complex nature of the electromagnetic structures involved. This complexity makes it difficult to gain an understanding of EMC problems by means of measurement engineering and mathematical analysis alone.

For example, EM simulations are frequently performed in conjunction with aircraft measurement campaigns. But they can be equally valuable in the design phase. EMCC performs EM simulations on wires, wire grids and other metallic objects using the proven Concept II MoM tool. Focus applications include HIRF, RFS, LEMP, NEMP, BCI and antennas. Drawing on its extensive experience, EMCCons applies numerical methods to gain deeper insight into EMC issues. The powerful combination of measurement engineering, EM theory, and analytical and numerical methods delivers rigorous results in a highly efficient way.

HIRF certification applications

Aircraft manufacturers perform measurement campaigns to achieve HIRF certification for their products. They complement these campaigns with EM simulation as part of HIRF assessments. Typically, this involves evaluating the specific RF behaviour of simplified (morphed) geometries of the aircraft. The data sets obtained are included as a supplement to the measurement results, providing a comprehensive analysis. EM simulation is also employed to interpret a ground setup with physical boundaries that differ from the flight, start and landing scenarios. The resulting relative impacts for these two situations can be quantified to a certain degree.

Numerical characterization of an HIRF test for an Evektor VUT 100 aircraft

Example showing a logarithmic periodic antenna placed in a Semi-Anechoic Chamber (SAC) with metal ground plane:

This is a typical task for EMC measurements with in-situ boundary conditions. It is useful for characterizing a test site and for validating a model before it is applied:

Antenna placed horizontally above ground plane
Comparison of obtained measurements versus simulation output

Example showing the analysis of a horn antenna in free space:

The characterisation of an antenna normally includes an assessment of radiation patterns and antenna behaviour over frequency. Key parameters are beam width, side lobes, antenna factor and antenna gain. The information obtained can be applied in antenna and test-setup design:

Current distribution of a horn antenna at 4.8 GHz
Far field radiation pattern of a horn antenna at 4.8 GHz

Current Seminars

2017-11-15 to 2017-11-17

  • EMC-Basics, Test and Measurement-Seminar for MIL and Avionic Standards

2017-11-16 to 2017-11-17

  • Test and Measurement-Seminar for MIL and Avionic Standards

2017-11-20 to 2017-11-22

  • EMC-Basics, HIRF/HERF – Electromagnetic Effects in Aircraft

2017-11-21 to 2017-11-22

  • HIRF/HERF – Electromagnetic Effects in Aircraft

2017-11-23 to 2017-11-24

  • Lightning Electromagnetic Effects on Aircraft

More information

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