Issue link: https://iconnect007.uberflip.com/i/1071356
JANUARY 2019 I DESIGN007 MAGAZINE 79 power flows not along the trace—as in the cases or transmission lines with the solid planes— but deviates in the horizontal as well as in the vertical directions (Figure 3). The power flow density depicts where the energy of the signal propagate; it is a very useful tool to investigate the field localization [5] . The cutouts below or close to the trace also prevent the return currents from flowing straight along the traces (Figure 4). Figure 3: Peak values of power flow density in plane with the Z-coordinate at 35 µm (top) and along the trace. Figure 4: Peak values of the surface current flow density on strips below (top) and the opposite side (bottom).