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

Table 1

Performance comparison between different antennas.

Antennas	Ref. [11]	Ref. [12]	Type A	Type B
Bandwidth (GHz)	2.29–3.46	2.29–4.4	2.3–4.39	2.29–4.35
Realized gain (dBi)	3.3–4.8	3.5–4.9	3.8–5.2	3.4–4.9
F/B ratio (dB)	≥ 10	≥ 8.1	≥ 10.1	≥ 10.6
Sub. sizes (mm^2)	60 × 50	60 × 50	60 × 50	60 × 50
Ant. Struc. (mm^2)	38 × 24	38 × 28	38 × 28	43 × 30.5