A Novel Ultrawideband Planar Inverted-F Antenna with Capacitive Ground Plane

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.

(a)

(b)

(c)

(d)