Dual-Band 2 × 2 MIMO Antenna with Compact Size and High Isolation Based on Half-Mode SIW

Table 1

Comparison study.

Reference	Center frequency (GHz)	Edge-to-edge (λ0)	Gain (dBi)	Minimum isolation (dB)	Total size	Diversity performance ECC	Excitation
[11]	2.45, 5.50	0.30	NA	17.5	0.9 λ0 × 0.9 λ0 × 0.015 λ0	0.057	Coaxial probe
[12]	3.50, 5.70	0.038	2.7, 2.8	18.4	0.7 λ0 × 0.7 λ0 × 0.075 λ0	0.08	Microstrip line
[13]	2.93, 5.68	0.226	4.0, 4.0	14	0.8 λ0 × 0.8 λ0 × 0.031 λ0	0.05	Microstrip line
[14]	3.27, 5.40	0.447	4.8, 5.3	20	1.6 λ0 × 1.6 λ0 × 0.236 λ0	0.06	Aperture coupled
[15]	2.54, 5.26	0.295	3.9, 4.1	21	1.3 λ0 × 1.3 λ0 × 0.027 λ0	0.07	Microstrip line
This work	4.43, 5.39	0.036	6, 6.4	35	1.4 λ0 × 1.4 λ0 × 0.028 λ0	0.005	Coaxial probe

λ₀ is the free-space wavelength at the upper-frequency band. NA = not available.