http://www.edaboard.com/thread337382.html
Originally Posted by
matrixofdynamism Vias turn at right angles and cause impedance discontinuity.
Yes, a bend causes some extra series inductance. One possible solution is to compensate by adding shunt capacitance before and after the bend (pi network, low pass).
Just in general, you should think of signal
and return (ground) path. You can design nicely matched transitions if you keep the 50 Ohm impedance in the vertical path, with proper placement of signal and return vias for controlled impedance in the via section.
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