| Ref | Technique used | Size (mm3) | Material and permittivity | Gain (dBi) | Bandwidth (MHz) | Number of frequency band | Resonant frequencies (GHz) | Return loss (dB) |
| [5] | Defected ground plane | 83 × 56 × 1.56 | FR4, 4 | 3.88, 3.87 & 3.83 | 380, 190 & 300 | 3 | 2.47, 3.55 & 5.55 | 20.8, 14.9 & 17.3 |
| [11] | SRR–CSRR–SIW rectangular resonator antenna based on a composite right/left-handed transmission line | 24.5 × 30 × 0.508 | Rogers RT/Duroid 5880, 2.2 | 5.33 & 5.25 | 30 & 80 | 2 | 5.26 & 9.11 | 16 & 19 |
| [12] | Defective ground structure | 34 × 30 × 1.6 | FR4, 4 | 2.017, 2.994 & −3.362 | 190, 120 & 90 | 3 | 2.40, 3.50 & 5.80 | 15.4, 12.8 & 15.2 |
| [18] | Composite right/Left handed transmission line based antenna | 34.1 × 9.9 × 1.6 | FR4, 4 | 1.51 & 1.94 | 200 & 610 | 2 | 2.72 & 5.51 | 25, 33 |
| [20] | 7 element antenna structure | 32 × 32 × 0.79 | Rogers RT 5880, 2.2 | 3.90 | 1400 | 1 | 3.592 | 46.78 |
| [21] | Sigma shaped patch and slotted ground plane | 29 × 29 × 1.6 | FR4, 4 | 4.76 | 190 | 1 | 5.8 | 21 |
| Proposed | Defective microstrip structure, defective ground structure | 35 × 35 × 1.6 | FR4, 4 | 2.79, 2.51 & 2.64 | 400, 490 & 420 | 3 | 3, 6 & 7 | 29.64, 26.37 & 27.58 |
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