A Novel Antenna Design of Compact HF and UHF Passive RFID Tags with Interconnected Structure for Energy Harvesting and Tracking Systems

Table 2

Comparison of the proposed dual-band RFID tag antenna with previous works.

Reference	Size (mm^2)	Antenna structure	Freq. band (MHz)	Pol.	Realized gain (dBi)
Mayer and Scholtz [10]	(credit card size)	Coil and shorted loop in multilayer	13.56/868	Linear	-4.69 @ 868
Ma et al. [11]	(credit card size)	Spiral coil and meander-line dipole combination on a single layer	13.56/915	Linear	-5.36 @ 915
Kenari et al. [12]	(credit card size)	Series Hilbert curve and square loop in a single layer	25/785/835/925	Circular	0.75 @ 25, 2.65 @ 785, 2.82 @ 835 2.75 @ 925
Sakonkanapong and Phongcharoenpanich [13]		Square spiral and CMA-based square loop combination in a single layer	13.56/922.5	Circular	1.67 @ 922.5
Farahani et al. [14]		Square spiral and meander line in a single layer	13.56/860	Linear	-1 @ 860
Phatarachaisakul et al. [15]		Square spiral and meander-line dipole in a single layer	13.56/922.5	Linear	0.62 @ 922.5
Nishioka et al. [16]	(credit card size)	Coil and monopole combination in a single layer	13.56/953	Linear	1 @ 953
Proposed antenna		Coil and patch-meander-line dipole in a single layer with a shorted point	13.56/922.5	Linear	-4.26 @ 922.5