LB
L.B. Besse
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This paper presents a novel method to parametrize gradient index (GRIN) structures based on a Fourier series distribution of the refractive index, scaled to the achievable range imposed by the material and manufacturing process. To demonstrate the proposed approach, a spherically symmetric lens is optimized and compared to a typical Luneburg Lens profile. A computationally efficient ray tracing algorithm is combined with Particle Swarm Optimization (PSO). An open source library is used to generate a dielectric crystal based on triply periodic minimal surface (TPMS) structures with spatially varying fill fraction. The lenses were printed using fused filament fabrication (FFF), fitted with a metallic cap, and radar cross section (RCS) measurements were taken in the $26-40 \text{GHz}$ range. The optimized lens offered marginal RCS improvements over a Luneburg lens with a truncated profile.
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This paper presents a novel method to parametrize gradient index (GRIN) structures based on a Fourier series distribution of the refractive index, scaled to the achievable range imposed by the material and manufacturing process. To demonstrate the proposed approach, a spherically symmetric lens is optimized and compared to a typical Luneburg Lens profile. A computationally efficient ray tracing algorithm is combined with Particle Swarm Optimization (PSO). An open source library is used to generate a dielectric crystal based on triply periodic minimal surface (TPMS) structures with spatially varying fill fraction. The lenses were printed using fused filament fabrication (FFF), fitted with a metallic cap, and radar cross section (RCS) measurements were taken in the $26-40 \text{GHz}$ range. The optimized lens offered marginal RCS improvements over a Luneburg lens with a truncated profile.