Compact, Slotted, Printed Antennas for Dual-Band Communication in Future Wireless Sensor Networks

Table 6

Electrical sizes, fractional bandwidths, and aggregate fractional bandwidths from the literature survey.

Reference work	Lower band		Upper band
	𝑘𝑎 (rad)	FBW	𝑘𝑎 (rad)	FBW	Aggr. FBW
Angelopoulos et al. [9]	3.03	0.086	6.47	0.063	0.149
Mendes et al. [10]	0.45	0.021	1.07	0.030	0.051
Moon et al. [11]	0.79	0.041	1.90	0.145	0.186
Cho et al. [12]	0.60	0.057	1.39	0.261	0.318
Nakano et al. [13]	1.11	0.041	2.65	0.282	0.323
Azad and Ali [14]	1.13	0.070	2.36	0.033	0.103
Cho et al. [15]	1.33	0.045	3.02	0.162	0.207
Wang et al. [16] (spiralled tail)	1.97	0.057	4.22	0.144	0.201
Wang et al. [16] (coupling element)	1.94	0.098	4.15	0.128	0.226
Michailidis et al. [17]	1.72	0.095	3.59	0.137	0.232
Chan et al. [18]	2.09	0.109	2.83	0.036	0.145
Yu and Choi [19]	1.14	0.187	2.51	0.153	0.340
Li et al. [21] (IFA mode)	1.16	0.085	3.04	0.078	0.163