Table 3.

Performance comparison between proposed antenna in a 1 × 2 MIMO configuration and other works.

Refs	Center-to-center spacing (λ0)	1 × 2 MIMO size (${\lambda }_0^3$)	Center frequency (GHz)	Bandwidth (%)	Isolation (dB)	Stable radiation patterns	Beam squint (°)	Complexity	Design method
30	0.51	1.1 × 0.51 × 0.07	29	3.7	> 36	Yes	0	Low	Bending rectangular patch antennas with two slits in each antenna
31	0.1	0.5 × 0.5 × 0.18	10	27.8	> 18	No	42	High; using air-gap and one dielectric block with high permittivity	A dielectric block above the array
32*	0.35	1.16 × 0.75 × 0.18	3.5	2.85	> 20	No	30	Medium; using air-gap	Array of slot metasurface above the patch antennas
33	0.58	1.44 × 0.9 × 0.05	5.4	14.8	> 20	No	30	Medium; using parasitic elements	Multiple square parasitic elements in proximity of the rectangular patch antennas
34	0.375	1.58 × 0.81 × 0.13	4.9	6	> 20	Yes	0	Low; using strips between elements	Field superposition
This work	0.9	1.8 × 0.9 × 0.08	27	29.6	> 18	Yes	0	Low	Manipulating the surface currents of the modes

*Simulated results.

λ₀: is the free space wavelength at the center frequency.