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Design of Linear to Circular Polarizer Using 3D-Printing and Artificial Anisotropic Material
KTH, School of Electrical Engineering and Computer Science (EECS).
KTH, School of Electrical Engineering and Computer Science (EECS).
2024 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

A linear to circular polarization converter constructed with material with high dielectricconstant is proposed. The polarizer uses artifical anisotropic materials to achieve circularpolarization and utilizes antireflection layers to minimize reflections at the polarizer interface.A prototype centered at 28.75 GHz is designed and manufactured using 3D printing and adielectric ABS plastic with advertised relative permittivity of 8. Measurement of the prototypeshow good performance centered around ~26 GHz, axial ratio at the center frequency is 0.28dB and remains < 1 dB in the frequency range ~25 GHz – 27 GHz, resulting in a fractionalbandwidth of 8%. Due to practical material properties the performance of the simulated andmanufactured polarizer differ from each other. The total thickness of the proposed polarizeris lowered compared to conventional dielectric polarizers without antireflection layers.

Abstract [sv]

En linjär-till-cirklulär-polarisator som är konstruerad av material med hög dielektrisk konstantföreslås. Polarisatorn använder konstgjorda anisotropa material för att erhålla cirkulärpolarisation och utnyttjar antireflektionslager för att minimera reflektioner vid gränsytan tillpolarisatorn. En prototyp centrerad kring 28.75 GHz designas och konstrueras med hjälp av3D printing och en dielektrisk ABS-plast med annonserad relativ permittivitet på 8. Mätningav prototypen visar på god prestanda som är centrerad kring en frekvens på ~26 GHz, detaxiella förhållandet är 0.28 dB och förblir < 1 i frekvensområdet ~25 GHz – 27 GHz, vilketresulterar i en relativ bandbredd om 8%. På grund av fysiska materialegenskaper skiljer sigbeteendet hos den fysiska och den simulerade polarisatorn. Den tillverkade polarisatornstotala tjocklek är mindre än andra konventionella dielektriska polarisatorer utanantireflektionslager.

Place, publisher, year, edition, pages
2024. , p. 331-337
Series
TRITA-EECS-EX ; 2024:161
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-358950OAI: oai:DiVA.org:kth-358950DiVA, id: diva2:1931071
Supervisors
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Kandidatexamensarbete Elektroteknik EECS 2024Available from: 2025-01-24 Created: 2025-01-24

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CiteExportLink to record
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Citation style
  • apa
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