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. 2015 Dec 14;5:18223. doi: 10.1038/srep18223

Figure 1. The schematic diagram of a straight waveguide structure with GIMs.

Figure 1

Region 1 and region 2 are composed of GIMs with a width of w, and located at the center of an empty waveguide. The two parallel blue lines are PEC walls. The distance between GIMs and PEC walls are both d.