Directivity Enhancement of a Broadband Printed Antenna by Using Two Closely Spaced Strips

Figure 5

Simulated and measured radiation patterns of the reference antenna in both E-plane (xoy-plane) and H-plane (yoz-plane) at different frequencies: (a) 2.5 GHz, (b) 3.0 GHz, (c) 3.5 GHz, and (d) 4 GHz.

(a)

(b)

(c)

(d)