A Miniaturized, Dual-Port, Multiband MIMO with CSRR DGS for Internet of Things Using WLAN Communication Standards

Table 3

Multiband MIMO current state of arts.

Ref. no	No. of ports	Bandwidth/resonant frequency	Isolation	Technique used (multibanding and isolation)	ECC	Size
[29]	4	(3.72-3.82) GHz; (4.65-4.76) GHz; (6.16-6.46) GHz	>16 dB	Slots cut in the square shaped patch	<0.1
[18]	4	(2.29-2.49) GHz; (2.85-3.04) GHz; (5.61-5.80) GHz	>18 dB	Square-shaped CSRR in DGS and use of metamaterial	<0.01
[19]	2	2.9 GHz; 4.3 GHz; 7.7 GHz	>26.55 dB	DGS and Vias	<0.0001
[23]	4	2.4 GHz; 3.66 GHz; 5.5 GHz	>14 dB	Slots in the DGS and SRR as parasitic element.	—
[20]	4	(2.25-2.41) GHz; (3.36-3.65) GHz; (4.7-6.25) GHz	>18 dB	Antenna element geometry	<0.001
[21]	2	(2.25-3.15) GHz; (4.89-5.95) GHz	>15 dB	Slits in the patch, rectangular stub, and DGS	<0.01
[30]	4	(3.3-3.84) GHz; (4.61-5.91) GHz	>15 dB	Antenna geometry	<0.02	(single element)
[31]	8	(3.3-4.2) GHz; (4.8-5) GHz	>10 dB	T-shaped decoupling stubs	<0.12
[32]	4	(3.4-3.6) GHz; (4.8-5) GHz	>16.5 dB	Slits and parasitic patch	<0.01
[33]	4	(2-3) GHz; (3.4-3.9) GHz; (4.4-5.2) GHz	>20 dB	Sierpinski triangle fractal array	<0.01
[34]	10	(3.3-4.2) GHz; (4.8-5.0) GHz	>10 dB	Double T-shaped antenna	<0.12
[35]	18	(3.4-3.6) GHz	>20 dB	Open-ended slots in the ground plane	<0.32
[36]	1	(2.1-3.3) GHz; (3.6-5) GHz; (6-10.6) GHz	NA	Defected ground compact electromagnetic band gap	NA
[37]	2	(2.6-3.3) GHz; (3.6-4.7) GHz; (6-10.6) GHz	>15 dB	Mushroom electromagnetic band gap arrangements	<0.02
Proposed system	2	2.4 GHz; 5.2GHz; 5.8GHz	>18 dB	CSRR in the DGS	<0.02