A Dual-Band Base Station Antenna with a Split Ring for Sub-6 GHz Communication

Table 2

Comparison with dual-band base station antennas.

References	Size of major radiator (λc × λc × λc)	VSWR	Bandwidth (GHz)	Isolation (dB)	Gain (dBi)
[13]	0.97 × 0.97 × 0.10	<2.0	0.81–0.96 (17%) & 1.69–2.24 (28%)	>26	8.8 ± 0.6/9.9 ± 0.7
[14]	0.35 × 0.35 × 0.18	<1.5	1.68–2.30 (31%) & 2.51–2.68 (7%)	>25	7.4 ± 0.6/7.3 ± 0.5
[15]	0.50 × 0.50 × 0.24	<2.0	2.40–2.48 (3%) & 5.15–5.85 (13%)	>30	8.4 ± 0.2/9.0 ± 1.0
[16]	0.63 × 0.63 × 0.14	<2.0	0.69–0.96 (33%) & 3.50–4.90 (33%)	>30	8.9 ± 0.5/8.2 ± 0.8
[17]	0.30 × 0.30 × 0.13	<2.0	2.40–2.65 (10%) & 5.00–6.40 (25%)	>27	7.8 ± 0.1/9.7 ± 0.4
[18]	0.48 × 0.48 × 0.09	<2.0	3.30–3.70 (11%) & 4.70–5.00 (6%)	>40	8.0 ± 0.3/10 ± 0.5
[19]	0.34 × 0.34 × 0.27	<1.5	1.71–2.69 (45%) & 3.35–3.60 (7%)	>35	8.1 ± 0.4/6.6 ± 0.5
This work	0.41 × 0.41 × 0.13	<2.0	2.31–3.77 (48%) & 4.71–5.89 (22%)	>23	8.2 ± 0.7/8.1 ± 0.6

The electric sizes are at the lowest operating frequency point.