33. When placed in free space, the antenna works in the
dipole mode, as shown in Fig. 2(a).
When placed on a metal surface, the antenna works in
the patch mode , as shown in Fig. 2(b).
33
50. • The two probes connected the
50Ω output ports of the dual-
feed network to the upper
circular radiating patch
• Lower patch excited via EM
coupling
50