Ka-band 2D Luneburg Lens Design with Glide-symmetric Metasurface
| Autor: | Miao, Jingwei |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: | |
| Druh dokumentu: | Text |
| Popis: | 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. En Luneburg-lins ar en lobformare som har tva fokalpunkter, en vid linsensyta och en i oandligheten. Den ar en billig passiv styrbar antenn vidhoga frekvenser. I detta examensarbete konstrueras en plan Luneburg-linsi metall for Ka-bandet. De kommersiella programvarorna CST MicrowaveStudio Suite och Ansys Electronic Desktop (HFSS) anvands for elektromagnetiskasimuleringar.Linsen bestar av tva glidsymmetriska metaytor med ett litet mellanrum.En hogre ordnings symmetri, glidsymmetri, kan ge linsen ultrabred bandbredd.Metaytorna bestar av ett stort antal enhetsceller. Olika typer avenhetsceller testas for att hitta den basta losningen med hansyn till badeelektromagnetiska egenskaper och tillverkningsbarhet. En tvadimensionellhornstruktur konstrueras for att uppna god matchning mellan linsens luftgapoch frirymd. En vagledarmatning designas ocksa, inklusive overgangfran koaxialledning till TE10-moden i en rektangular vagledare, som anslutertill linsens fokalpunkt.En prototyp kommer att byggas i ett senare skede och matningar gorasfor att jamfora med simuleringsresultaten i detta examensarbete. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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