The Novel Microwave Stop-Band Filter

Figure 5

The dependence of the resonance frequency on the slot depth: (1) 𝑎=9 mm, 𝑏=15 mm, 𝑤=0.5 mm, 𝜀₁=𝜀₂=1; (2) 𝑎=𝑑, 𝑏=15 mm, 𝑤=0.5 mm, 𝜀₁=1, 𝜀₂=3.78.