Thomas Fischer

An analytical model for studying the electromagnetic radiation of power-bus structures

The electromagnetic radiation of multilayer boards due to power-bus noise is investigated for an idealized rectangular structure. The derivation of the far field is based on the field equivalence principle, using a lossy cavity model for the required boundary electric field distribution. The maximum electric field is studied within the frequency range 30 MHz-1 GHz. A parameter study shows that the distance between the planes is one of the most effective means for lowering radiated emissions.

Dynamic RWA for All Optical Networks Using Linear Constraints for Optical Path Feasibility Assessment

We propose a fast and simple RWA algorithm with physical constraints which are modeled by linear restrictions based on wavelength groups, length, and hops. Simulation results indicate blocking performance close to unconstrained RWA.

PMD rules for physical constraint-based routing in all optical networks

PMD rules are developed from transmission modeling, enabling a fast and accurate estimate of the PMD penalty with and without mitigation, which are well suited for the physical constraint-based routing computation

Dynamic markers for collaborative discussion on video content

In this paper we propose an interactive tool for generating dynamic markers for video object in a distributed video content discussion environment. We address interactive video object selection and real-time video object marker generation which is supported by an automatic object tracking method. The proposed system satisfies the following criteria: (i) automatic object tracking has to be in real- time; (ii) the video object selection has to be carried out with minimal effort and knowledge; (iii) the user has to be notified by the system when the automatic object tracking method encounters problems: and (iv) interactive rectification of the object marker has to be instantaneous and direct. Our experimental results indicate that the proposed tool is very effective and intuitive in creating dynamic object markers for video content on the fly. Automatic object tracking method yields reliable results on a desktop PC in real-time, even with busy background and/or partial occlusion.

Analytical prediction of the effect of conductive planes on EMC filter structures

This paper deals with modeling and simulation of the influence of conductive cover planes on electrical low-pass filter structures. The filter structures are used for electromagnetic compatibility (EMC) purpose within the frequency range of a few MHz up to 4 GHz. It is shown that there is a significant influence of the conductive planes caused by standing waves between the cover plane and the ground plane. To make an analytical modeling approach possible, the filter structures have to be simplified and the wave equation is solved by means of Greens function. Finally, the results are compared to simulation by a commercial field solver and to measurements on simple printed circuit board structures.