282373.fig.005a
(a)
282373.fig.005b
(b)
282373.fig.005c
(c)
282373.fig.005d
(d)
Figure 5: Radiation patterns of the ultrawideband PIFA: (a) 2.5 GHz, (b) 4.0 GHz, (c) 6.0 GHz, and (d) 8.5 GHz.