ZHCSYD4R June 2001 – June 2025 SN74LVC1G66
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Reflections and matching are closely related to loop antenna theory, but different enough to warrant a separate discussion. When a PCB trace turns a corner at a 90 degree angle, a reflection can occur. This occurs primarily due to the change of width of the trace. At the apex of the turn, the trace width is increased to 1.414 times the width. This upsets the transmission line characteristics — especially the distributed capacitance and self–inductance of the trace — resulting in the reflection.
Not all PCB traces can be straight, and so can require turning corners. Figure 8-3 shows progressively better techniques of rounding corners. Only the last example maintains constant trace width and minimizes reflections.