Figure 1: Modeling a periodic screen using two different types of unit cell.
[[File:pmom_per3_tn.png|400px]] [[File:pmom_per4_tn.png|400px]]
Figure 2: The PMC aperture unit cell and its planar mesh.
[[File:pmom_per5_tn.png|400px]] [[File:pmom_per6_tn.png|400px]]
Figure 3: The PEC cross unit cell and its planar mesh. Notice the cell extensions at the unit cell's boundaries.