Fig. 1. Different SSPPs unit structures and their dispersion curves

Fig. 2. Structure of SSPPs low-pass filter

Fig. 3. Dispersion curves of unit cells in the transition

Fig. 4. The simulated S-parameters of SSPPs low-pass filter part

Fig. 5. The simulated electric field distributions of the SSPPs waveguide

Fig. 6. Structure of CPW high-pass filter part

Fig. 7. The simulated S-parameters with and without rectangular strips loaded

Fig. 8. S₂₁ variation curves with b and h₄

Fig. 9. The proposed CPW fed SSPPs BPF

Fig. 10. Measured and simulated S-parameters of the SSPPs BPF