Ka-band 2D Luneburg Lens Design with Glide-symmetric Metasurface

University essay from KTH/Elektroteknisk teori och konstruktion

Author: Jingwei Miao; [2017]

Keywords: ;

Abstract: A Luneburg lens is a beam former that has two focal points where one isat the surface and the other lies at innity. It is a cheap passive steerableantenna at high frequencies. In this thesis, a 2D at-prole Luneburglens with all-metal structure is designed for Ka band. Commercial softwareCST Microwave Studio Suite and Ansys Electronic Desktop (HFSS)are used for simulations.The lens is composed of two glide-symmetric metasurface layers with asmall gap in between. The high order symmetry, glide symmetry, couldprovide ultra wide band property for the lens. Each layer contains manyunit cells. Dierent unit cells are tested in this thesis to nd the best solutiontaking into account both electromagnetic properties and the easinessof manufacturing. A are is designed to achieve better matching betweenthe air gap of the lens and free space. A self-designed waveguide feedingis also used, including a transition from coaxial cable to TE10 mode ofrectangular waveguide at the focus of the lens.The prototype will be built in the future and measurements will be doneto compare with simulation results in this thesis.

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