Table 2.

The comparison between the results of some previous work with the present one (here $\lambda$ represents the wavelength of the corresponding lower resonant frequency).

Antenna	Description	Antenna Dimension at the Lower Passband Frequency	Percentage Bandwidth	Gain (dB)	Efficiency (%)
[9]	Slit loaded antenna with DGS	(0.33 $\lambda$ × 0.23 $\lambda$)	6.5 (2.45 GHz) 4.18 (3.5 GHz) 4.97 (5.28 GHz)	4.72 6.2 3.8	- - -
[13]	A dual-band highly miniaturized patch antenna with DGS	(0.16 $\lambda$ × 0.15 $\lambda$)	- -	−1.7 (2.43 GHz) 2.4 (5.2 GHz)	30 81
[11]	Microstrip patch antenna for radiolocation using DGS with improved gain and bandwidth	(0.28 $\lambda$ ×0.28 $\lambda$)	3.2 (5.9 GHz) 3.5 (9.1 GHz) 3.7 (10.4 GHz)	2.5 6.1 5.3	78.89 82.33 67.85
[32]	Dual-band slim microstrip patch antennas (no DGS)	(0.19 $\lambda$ × 0.32 $\lambda$)	4 (1.9 GHz) 2.2 (3.5 GHz)	1 2.4	28 35
[33]	Slot loaded rectangular patch antenna on a glass-reinforced epoxy laminated inexpensive substrate	(0.09 $\lambda$ × 0.12 $\lambda$)	81.72 (0.460 GHz) 6.99 (4.5 GHz)	6.6 (dBi) 9.7 (dBi) Average gain	85 88
[15]	Dual-band miniaturized microstrip slot antenna for wireless local area network (WLAN) applications	(0.16 $\lambda$ × 0.32 $\lambda$)	1.673 (2.4 GHz) 2.2 (5.83 GHz)	2.76 1.7	52 31
[Present Work]	Dual-band slot antenna without DGS	(0.42 $\lambda$ × 0.42 $\lambda$)	3.75 (3.736 GHz) 1.98 (−8 dB) (6.076 GHz)	5.164 5	82.15 70.61
	Dual-band slot antenna with DGS	(0.4 $\lambda$ × 0.4 $\lambda$)	12.49(3.532 GHz) 4.49 (6.835 GHz)	4.02 3.38	88.2 76.88