Filter 3

Modified dielectric frequency selective surfaces with enlarged bandwidth and angular stability

Leonardo Zappelli, IEEE member This page contains the results for the stopband filter #3 obtained with the cascade shown in Fig. 1, relative to the five MDFSSs reported in the Table. Each MDFSS resonates at f₀, θ₀ .

Fig. 1: Filter Structure.

Fig. 2: Contour plot of the reflected power |S₁₁|² in the f-θ plane for two levels: 0.9 < |S₁₁|² < 0.99 and 0.99 < |S₁₁|² <1. (a): superposition of the contour plots relative to the single "25°a" and "30°a" MDFSSs (see Tab. I) resonating at 14.9 GHz,25° and 14.89 GHz,30°, respectively. (b): Contour plot of the reflected power of the "25°a" - "30°a" MDFSSs cascade, seen from section BB' of Fig. 1. The net bandwidth at 15 GHz is about 220 MHz (14.82 GHz - 15.04 GHz in the range 24° - 30°) and is highlighted with a rectangle. The separation length is s₁=12.8 mm.

Fig. 3: Contour plots of the reflected power |S₁₁|² in the f-θ plane for two levels: 0.9 < |S₁₁|² < 0.99 and 0.99 < |S₁₁|² <1. (a): superposition of the contour plots relative to the single "20°" (see Tab. I) resonating at f0=15 GHz and 20° (red and dark red areas) and to the "25°a"-"30°a" MDFSSs cascade (yellow and violet areas) (section BB' in Fig. 1). (b): reflected power of the "20°" - "25°a" - "30°a" MDFSSs cascade, seen from section CC' of Fig. 1. The net bandwidth is about 280 MHz (14.78 GHz - 15.06 GHz) in the range 20° - 30° and is highlighted with a rectangle. The separation length is s₂=14 mm.

Fig. 4: Contour plots of the reflected power |S₁₁| in the f-θ plane for two levels: 0.9 < |S₁₁|² < 0.99 and 0.99 < |S₁₁|² <1. (a): superposition of the contour plots relative to the single "10°" (see Tab. I) resonating at f0=15 GHz and 10° (red and dark red areas) and to the "20°"-"25°a"-"30°a" MDFSSs cascade (brown and yellow areas) (section CC' in Fig. 1). (b): reflected power of the "10°"-"20°"-"25°a"-"30°a" MDFSSs cascade, seen from section DD' of Fig. 1. The net bandwidth is about 280 MHz (14.80 GHz - 15.08 GHz) in the range 10°-30° and is highlighted with a rectangle. The separation length is s₃=15.8 mm.

Fig. 5: Contour plots of the reflected power |S₁₁| in the f-θ plane for two levels: 0.9 < |S₁₁|² < 0.99 and 0.99 < |S₁₁|² <1. (a): superposition of the contour plots relative to the single "0°a" (see Tab. I) resonating at f0=14.91 GHz and 0° (red and dark red areas) and to the "10°"-"20°"-"25°a"-"30°a" MDFSSs cascade (blu and sky blu areas) (section DD' in Fig. 1). (b): reflected power of the "0°a"-"10°"-"20°"-"25°a"-"30°a" MDFSSs cascade, seen from section EE' of Fig. 1. The net bandwidth is about 300 MHz (14.78 GHz - 15.08 GHz) in the range 0° - 30° and is highlighted with a rectangle. The separation length is s₄=12.3 mm.