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(a)
(b)
(c)
(d)
(e)
(f)
Fig. 9: The surface current distribution at different frequency (g)
when port 1 excited.
Fig. 10: The 3D radiation pattern at different frequencies (a)
4 GHz (b) 5.5 GHz (c) 8.5 GHz (d)18 GHz (e) 24 GHz (f)28
GHz (g) 38 GHz.
