電磁干擾濾波器整體問題探討及設計

There are two key objectives accomplished in the past year.
1. Design and construction of high-accuracy noise separator for EMI: A new
noise separator using the latest radio-frequency power combiners has been
constructed and tested. The latest combiner features 50-ohm input impedance
and the splitter accuracy better fits the EMI range (10 KHz to 30 MHz) than
those used previously. As a result, the separating accuracy improves, especially
in the low-frequency range. This new separator can be used for diagnosis of
noise problem with higher accuracy than previously reported.
2. Incorporation of mixed-mode noise phenomena into EMI filter design
procedure: The new design procedure can lead to significant reduction of filter
size. This is possible because of deeper understanding of the noise coupling
phenomenon and therefore avoid unnecessarily large DM filter. Filters
designed from the proposed procedure was constructed and tested in the lab.
The results agree well with the theory. The new procedure can save designers
much time for filter design.