A miniaturized common-mode filter composed of multiple substrates with positive and negative coils formed on alternate substrates is proposed in this paper. The pattern of each positive coil is interlaced with that of each negative coil, whereby when the positive and negative coils are alternately stacked, the positive coil do not overlap the negative coil. With such offset configuration, the parasitic capacitance introduced between positive and negative traces is reduced, so the thickness of each substrate can be decreased and the size of the entire filter is effectively reduced. Good agreements between simulated and measured results are demonstrated. Further, the effectiveness of this filter is confirmed by eye diagram and radiation emission measurements.
|Number of pages||9|
|Journal||IEEE Transactions on Electromagnetic Compatibility|
|State||Published - 1 Nov 2004|
- Common-mode filter
- Differential signal
- Low-temperature co-fired ceramic (LTCC)
- Mixed-mode S parameters