Design of a Dual-Band Bidirectional Antenna Using Superellipse-Monopole-Fed Rectangular Ring for IEEE 802.11 a/b/g/n Applications

Table 3

Comparison of some bidirectional antennas used in the 2.4 GHz and/or 5 GHz WLAN bands.

Number	Ref. model	Freq. band type	Absolute bandwidth &; frequency range (GHz)		Peak gain (dBi); at specific frequency				Overall size; in mm
			2.4 GHz-band	5 GHz-band	2.45 GHz	5.2 GHz	5.5 GHz	5.8 GHz
1	[31]	Single	0.23 (2.29–2.52)	N/A	3.8	N/A	N/A	N/A
2	[32]	Single	0.32 (2.32–2.64)	N/A	9.6	N/A	N/A	N/A
3	[33]	Dual	0.28 (2.25–2.53)	0.51 (5.47–5.98)	5.75	N/A	7.00	8.50
4	[34]	Dual	0.42 (2.22–2.64)	1.16 (5.25–6.41)	5.95	N/A	6.90	8.80
5	Proposed	Dual	0.81 (2.10–2.91)	2.39 (3.57–5.96)	4.67	7.10	7.83	7.85