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