Table 1.
Performance comparison with recent state of the art in the literature.
| Refs. | Dim. (λo) | Technique used | No. of ports | Center frequency (GHz) | Fractional bandwidth (%) | Min. isolation (dB) | Edge to edge (λo) | Gain (dBi) |
|---|---|---|---|---|---|---|---|---|
| 27 | 4.8 × 2.1 | cDRA | 2 | 30 | 6.1 | 25 | λo/3.6 | 6.9, 8.6 |
| 28 | NA | Horn-shaped Via | 4 | 36 | 11 | 21 | λo/1.27 | 10.8 |
| 29 | 3.9 × 7.9 | Metasurface | 2 | 28 | 17.8 | 37.1 | NA | 16.13 |
| 30 | 4.47 × 0.89 | corner trimming | 4 | 28 | 17 | 21 | λo/6 | 10 |
| 31 | 0.41 × 0.44 | Adding Decoupling structure | 4 | 3.1 | 136 | 20 | NA | 4 |
| 32 | 1.85 × 5.6 | DGS | 4 | 25 | 22 | 28 | NA | 7.1 |
| 14 | 0.704 × 1.05 | Wilkinson Power Divider | 2 | 2.1 | 9.60 | < 20 | 0.14 λo | NA |
| 5 | 0.94 × 4.46 | Near-Field Resonators | 8 | 2.35 | 1.4 | < 20 | 0.016 λo | 6.8 |
| Prop. work | 1 × 0.5 | Slits in the radiating part | 2 | 29 | 3.7 | 36 | λo/9 | 6 |