Research Article
Application of Defected Ground Structure to Suppress Out-of-Band Harmonics for WLAN Microstrip Antenna
Table 1
Comparison of conversional rectangular patch antenna with various fractal slot iterations of antenna.
| | Iteration | Resonating frequency (GHz) | Number of higher harmonics | Return loss (dB) | VSWR | Gain (dB) | Radiation efficiency (%) | Bandwidth of fundamental resonance frequency (%) | higher harmonics | Bandwidth of 2nd harmonics (%) | Patch size (mm2) | Size reduction (%) |
| | 0 | 2.42 | 1 | −12.53 | 1.61 | 6.3 | 67.6 | 2.46 | 2.90 | — | 1725 | — | | 1st | 2.43 | 2 | −13.44 | 1.54 | 3.3 | 55.4 | 3.27 | 2.64 | 5.08 | 983.25 | 43 | | 2nd | 2.42 | 2 | −22 | 1.17 | 3.8 | 51.2 | 3.30 | 9.19 | 4.34 | 983.25 | 43 | | 3rd | 2.42 | 2 | −27 | 1.2 | 4.16 | 51.5 | 3.27 | 2.29 | 4.93 | 983.25 | 43 | | 3rd with H-DGS | 2.45 | 0 | −23.26 | 1.14 | 4.46 | 63.8 | 3.68 | — | — | 932 | 46 |
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