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This article presents the designs of ultrawideband microwave flat #gradient #index (#GRIN) #lenses, which realizes over a 108% fractional bandwidth (12-40 GHz). The frequency-independent ray optics method is employed to determine the radially varying permittivity profile of the lenses. The challenge of realizing such a radially varying profile and the limitations in dielectric material choices are overcome by two additive-manufacturing-aided approaches: 1) partially infilled dielectrics with a varied periodicity, which ensures the lens performance at the higher end of the frequency range and 2) #artificially #engineered #dielectrics (#AED) with subwavelength-scale metallic inclusions, which enables-high permittivity dielectrics and leads to benefits of thickness and mass reduction for the GRIN lenses. ---- Shiyu Zhang, Ravi Kumar ARYA ,Prof. Will Whittow, Darren Cadman, Raj Mittra, J. C. Vardaxoglou More details can be found at this link: https://lnkd.in/eaHHDtV8

Ultra-Wideband Flat Metamaterial GRIN Lenses Assisted With Additive Manufacturing Technique

Ultra-Wideband Flat Metamaterial GRIN Lenses Assisted With Additive Manufacturing Technique

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