Appendix J. Right Angle Corners
The influence of 90-degree corners on neighboring circuits is one of the most controversial topics in PCB design. It ranks right beside the routing of bypass capacitor leads as a guaranteed argument starter.
The arguments against 90-degree corners fall into two categories: impedance control and EMI. I summarize each one of those here.
Impedance Control
Unless very carefully constructed, a trace rounding a corner will necessarily be wider at the corner than it is in the middle of the trace. Since control over impedance requires a controlled geometry, and since a trace that changes width does not have a controlled geometry by definition, then necessarily there must be an impedance discontinuity (a change in impedance) ...
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