Compact Quadband Bandstop Filter Based on Concentric Split Ring Resonators with Perturbation for Multifunctional Wireless Systems

Figure 3

Design process of the proposed hybrid quadband lowpass-passband filter: (a) Step 1, (b) Step 2, (c) Step 3, and (d) Step 4.

(a)

(b)

(c)

(d)