Filter 1

Modified dielectric frequency selective surfaces with enlarged bandwidth and angular stability

Leonardo Zappelli, IEEE member This page contains the results for the stopband filter #1 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°" and "30°" MDFSSs (see Tab. I) resonating at f0=15 GHz and 25°, 30°, respectively. (b): Contour plot of the reflected power of the "25°"-"30°" MDFSSs cascade, seen from section BB' of Fig. 1. The net bandwidth at 15 GHz is about 80 MHz (14.96 GHz - 15.04 GHz in the range 23.8° - 30°) and is highlighted with a rectangle. The separation length is s₁=16.5 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°"-"30°" MDFSSs cascade (yellow and violet areas) (section BB' in Fig. 1). (b): reflected power of the "20°"-"25°"-"30°" MDFSSs cascade, seen from section CC' of Fig. 1. The net bandwidth is about 150 MHz (14.89 GHz - 15.04 GHz) in the range 16.5° - 30° and is highlighted with a rectangle. The separation length is s₂=7.5 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°"-"30°" MDFSSs cascade (brown and yellow areas) (section CC' in Fig. 1). (b): reflected power of the "10°"-"20°"-"25°"-"30°" MDFSSs cascade, seen from section DD' of Fig. 1. The net bandwidth is about 170 MHz (14.86 GHz - 15.03 GHz) in the range 10° - 30° and is highlighted with a rectangle. The separation length is s₃=6.7 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°" (see Tab. I) resonating at f0=15 GHz and 0° (red and dark red areas) and to the "10°"-"20°"-"25°"-"30°" MDFSSs cascade (blu and sky blu areas) (section DD' in Fig. 1). (b): reflected power of the "0°"-"10°"-"20°"-"25°"-"30°" MDFSSs cascade, seen from section EE' of Fig. 1. The net bandwidth is about 110 MHz (14.92 GHz - 15.03 GHz) in the range 0° - 30° and is highlighted with a rectangle. The separation length is s₄=10.4 mm.