Characteristic Mode-Based Neutralization Line Design for MIMO Antenna

Table 2

Performance comparisons with the previously published literature.

Ref.	Decoupling method	Max decoupling improvement	Number of ports	Bandwidth	Bands	Edge-to-edge distance	Complexity
[3]	Decoupling network	15 dB	2	Narrow	Single	0.055λ0	Yes
[5]	Decoupling network	10 dB	2	Wide	Single	0.084λ0	Yes
[8]	Metamaterial	32 dB for X-band; 27 dB for ku-band; 26 dB for K-band	4	Wide	Six	0.26λ0	Yes
[9]	Fractal metamaterial EBG	17 dB for S12; 37 dB for S13; 17 dB for S14	4	Wide	Three	0.5λ0	Yes
[12]	EBG	10 dB	2	Narrow	Single	0.5λ0	Yes
[13]	Uniplanar compact EBG	14 dB	2	Narrow	Single	0.5 λ0	Yes
[14]	Fractal UC-EBG	16 dB	2	Narrow	Single	0.22λ0	Yes
[17]	DGS	40 dB	2	Narrow	Single	0.031λ0	No
[18]	DGS	17.4 dB	2	Narrow	Single	0.23λ0	No
[19]	SRR	10 dB	2	Narrow	Single	0.25λ0	Yes
[21]	NL	23.7 dB	2	Wide	Single	0.079λ0	No
[22]	NL	16 dB	2	Narrow	Single	0.114λ0	No
This work	TCM + NL	18 dB	2	Narrow	Two	0.033λ0	No