Table 1.

Presented design comparison with design published in the literature.

Ref	Size (mm × mm)	Isolation of simple design (dB)	Isolation refined (dB)	Gain (dB)	Operational Bandwidth (GHz)	Number of Antennas	The technique used to refine isolation
[24]	20 × 20	−16	−24	–	27.5–28.35	2	Metal strip
[25]	85 × 21	−22	−38	16.3	27–32	2	Meta surface
[26]	30 × 35	−15	−40	12	27.5–28.5	4	Parasitic Patch
[27]	30 × 43	−32	−45	10.2	24.55–26.5	4	Meta surface
[28]	25 × 15	−14	−41	6.3	26–30.5	2	DRA
[29]	48 × 31	–	−21	10	26–31	4	Parasitic Patch
[30]	26 × 14.5	−19	−22	4.5	27–29	2	Meta surface
[31]	20 × 40	−18	−28	9	27.5–28.5	4	Meta surface
Prop.	12 × 20	−18	−29	9.25	24–30.25	2	Parasitic Patch