Sökning: "refractive index"

Visar resultat 31 - 35 av 52 uppsatser innehållade orden refractive index.

  1. 31. 3D Printing a Maxwell Fish Eye Lens With Periodic Structures

    Kandidat-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Valentine Lin; Tarek Sayed Hamad; [2019]
    Nyckelord :Maxwell fish eye lens; dielectric lens antenna; metamaterial; periodic structure; 3D printed lenses.;

    Sammanfattning : With the rise of high frequency communication systems such as 5G, new types of antennas has to be developed in order to meet the new requirements. In recent years, lens antennas made of periodic structures has been shown to have desirable performance when increasing operational frequency without increasing the size of the antennas. LÄS MER

  3. 32. Ray Tracing and Spectral Modelling of Excited Hydroxyl Radiation from Cryogenic Flames in Rocket Combustion Chambers

    Master-uppsats, Luleå tekniska universitet/Institutionen för system- och rymdteknik

    Författare :Jaka Perovšek; [2018]
    Nyckelord :spectral modelling; excited hydroxyl radiation; OH* radiation; ray tracing; spectroscopy; rocket combustion chambers; rocket engines; hydrogen-oxygen combustion; combustion instabilities;

    Sammanfattning : A visualisation procedure was developed which predicts excited hydroxyl (OH*) radiation from the Computational Fluid Dynamics (CFD) solutions of cryogenic hydrogen-oxygen rocket flames. The model of backward ray tracing through inhomogeneous media with a continuously changing refractive index was implemented. LÄS MER

  4. 33. SnOx electron selective layers for perovskite/silicon tandem solar cells using atomic layer deposition

    Master-uppsats, KTH/Energiteknik

    Författare :Lisa Anna Zafoschnig; [2018]
    Nyckelord :;

    Sammanfattning : In this work the application of ALD deposited SnOx films as electron transport layers in perovskite solar cells is analysed. Processes to fabricate homogeneous, transparent and conductive tin oxide films were developed on an Oxford Instruments FlexAL tool using a TDMASn precursor and H2O as oxidiser. LÄS MER

  5. 34. A Cost-Effective Luneburg Lens Based on Glide-Symmetric Metasurface for 5G Applications

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Martin Mattsson; [2018]
    Nyckelord :;

    Sammanfattning : In this work, a cost-eective at Luneburg lens antenna operating at the Ka-band is presented.The antenna is suitable for high frequency applications in future communicationnetworks such as 5G systems due to its simple feeding, high directivity, and low loss.The lens is composed of a parallel plate structure loaded with glide-symmetric holes. LÄS MER

  7. 35. Verification of 3D-printed quasi-optical lenses for 60GHz radar applications

    M1-uppsats, Högskolan i Halmstad/Akademin för informationsteknologi

    Författare :Adrian L. Hagström; L. Albin M. Vass; [2018]
    Nyckelord :60GHz Radar Quasi-optics 3D-Printing 3D-Printed PLA Lenses Verification Electromagnetic Simulation Refractive Index; 60GHz Radar Kvasioptisk 3D-Utskrivning 3D-Utskrivna PLA Linser Verifiering Elektromagnetiska Simulering Brytningsindex;

    Sammanfattning : With the recent rise of 3D-printing as a form of manufacturing and their advantages for quick prototyping there is an interest for 3D-printed optical components. This thesis tests how well 3D-printed quasi-optical components preform and verify measurements with electromagnetic simulations. LÄS MER