Figure 7.
3D radiation patterns: monopole at (a) 3.5 GHz and (b) 5.5 GHz; DRA1 at (c) 3.5 GHz and (d) 5.5 GHz; DRA2 at (e) 3.5 GHz and (f) 5.5 GHz; DRA3 at (g) 3.5 GHz and (h) 5.5 GHz.
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