Showing papers by "Thales (Netherlands) published in 2004"

Reduction of radiated electromagnetic fields by removing power planes

Abstract: The noise voltage in the reference or ground of a printed circuit board is often the cause of unwanted radiated emission. Power supply planes attribute to the noise voltage. By replacing the power supply planes by tracks, the noise voltage in the reference or ground can be considerably reduced, which leads to a dramatic reduction of the radiated electromagnetic fields. This has been shown using transmission line equations for a general two-conductor line. Simulation and measurements results confirm the beneficial effect of removing power planes. A reduction of 50 dB in radiated electromagnetic field strength was obtained.

Validation Of Naval Platform Electromagnetic Tools Via Model And Full-Scale Measurements

Abstract: Reliable EMC predictions are very important in the design of a naval platform's topside. Currently, EMC predictions of a Navy ship are verified by scale model and full-scale measurements. In the near future, the validation of software tools leads to an increased confidence in EMC predictions and (hopefully) removes the need for scale model measurements. In general, full-scale verification measurements will remain necessary, although perhaps fewer measurements will be required. The paper presents our topside design experience, from rough estimations 40 years ago, to analytical calculations and model measurements 20 years ago, to the numerically supported process as it is now. It shows the process of validating simulation tools with model and full-scale measurements. It also describes the challenges encountered and the deficiencies of commercial tools used now and the roadmap for Thales Naval Netherlands towards the integrated tools of the future.