Wearable BLE Wireless Sensor Based on U-Shaped EBG Monopole Antenna

Table 7

Comparison of the proposed antenna on body with some references.

Ref.	Size ()	BW (%)	Gain (dBi)	Eff. (%)	(W/kg)/ (W)
[1]		14	—	—	2.25; -
[5]		14.1	0.919	—	0.1; -
[9]		33.3	2.18	81.4	<2; 0.265
[10]		7.9	2.06	45	-0.34
[15]		5	7.3	70	—
[16]		8.3	6.55	—	5.99; 1
[17]		14.7	7.3	70	0.23; -
[21]		144	6.57	96.99	—
[22]		85.4	5.65	99.35	—
[23]		120	7.46	99.3	—
[24]		22.9	3.5	95	-
[25]		5.2	2.71	—	0.0091; -
This work		33	6.87	73.68	0.68; 0.5

is the wavelength in the dielectric at 2.4 GHz; BW means bandwidth.