Perhaps it's stating the obvious, but are you aware that you need both orthogonality AND symmetry? Eg, the centre of one inductor on the axis of the other (like a "T"). Looking at it another way, inductors forming the legs of an "L" can be orthogonal, but still couple quite well.
Tony (remove the "_" to reply by email)
I've managed to get my four poles back on my filter, which is good. Seem to have removed the coupling effects. Did this by laying the chip capacitors on their sides (helps to increase Q) and putting parallel capacitors right next to each other (helps to reduce inductance). However, filter response still not good as there is a massive roll-off and poles slightly out of place.
cheers for the help,
snip
I did this on a high density converter - kiss automatic placement goodbye.
RL
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