838364.fig.0017a
(a)
838364.fig.0017b
(b)
838364.fig.0017c
(c)
838364.fig.0017d
(d)
Figure 17: Sequence showing the antenna concept. (a) A slot on the ground plane is tuned at 1900 GHz (band #2); (b) PIFA is tuned at 900 MHz (band #1); (c) parallel excitation of both antennas (PIFA + slot); (d) reflection coefficient of the antenna system. Ground plane is for all cases.