Research Article
Gain Improvement of Dual Band Antenna Based on Complementary Rectangular Split-Ring Resonator
| Parameters | Simulated results | Measured results | Matching characteristics |
| First resonance () |
| , (GHz) | 4.352 | 4.19 | Reflection coefficient, (dB) | −16.75 | −21.25 | Effective bandwidth at −5 dB (%) | 1.60 | 1.52 |
| Second resonance () |
| , (GHz) | 4.892 | 4.808 | Reflection coefficient, (dB) | −15.15 | −13.86 | Effective bandwidth at −5 dB (%) | 1.79 | 1.72 |
| Radiation characteristics |
| First resonance () |
| Peak directivity, (dBi) | 7.16 | 7.36 | Peak gain, (dB) | −0.97 | −0.11 | Radiation efficiency (%) | 15.38 | 17.92 |
| Second resonance () |
| Peak directivity, (dBi) | 7.243 | 7.74 | Peak gain, (dB) | 5.946 | 5.85 | Radiation efficiency, (%) | 74.18 | 64.83 |
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