Research Article
Compact Quadband Bandstop Filter Based on Concentric Split Ring Resonators with Perturbation for Multifunctional Wireless Systems
Table 3
Comparison between this work and other reported multiband bandstop filters.
| Ref. | Stopbands | Center frequencies of stopbands (GHz) | Fractional bandwidth (%) | Size ( × ) |
| [16] | 4 | 1.24/3.2/6/8 | 40/30/25/26 | 0.139 × 0.171 | [26] | 4 | 1.16/1.58/1.94/2.37 | 5.2/6.9/2.9/1.3 | 0.26 × 0.25 | [9] | 3 | 1.8/2.4/3 | 20/12/22 | 0.44 × 0.44 | [27] | 3 | 3.8/6.7/9.5 | 19.2/6.7/3.3 | 0.682 × 0.325 | [28] | 2 | 1.4/2.57 | 12.7/10.11 | 0.650 × 0.380 | [29] | 3 | 2.24/4.8/6.52 | 79/26/13 | 0.090 × 0.310 | [30] | 2 | 3.35/5.75 | 6/1.7 | 0.270 × 0.270 | This work | 4 | 1.2/1.97/2.96/4.78 | 8.7/4.51/36.69/23.32 | 0.197 × 0.197 |
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