Summary
International Symposium on Electromagnetic Compatibility
2009
Session Number:22R1
Session:
Number:22R1-4
Influence of Different Configurations of Premises Cable on the Interference Immunity of VDSL Systems
T. Fischer, G. Schubert,
pp.457-460
Publication Date:2009/7/20
Online ISSN:2188-5079
Summary:
This paper deals with the influence of metal cover planes close to SMD filter structures. The low-pass structures are used for EMC purpose in the automotive industry and work in a frequency range of 100 kHz to 4 GHZ. Up to now, the influence of a metal housing is neglected during the design phase. In this paper, an ungrounded metal cover plane is assumed to be part of the housing. It will be shown by measurement and simulation that this plane changes the filter behavior significantly. These changes depend of the filter components used, the filter attenuation and the frequency area. So, some theoretical explanations are derived to provide a good understanding of the occurring effects. Finally, a full wave parameter study was carried out in order to confirm the theory and to derive some design rules.