Essays about: "refractive index"

Showing result 1 - 5 of 25 essays containing the words refractive index.

  1. 1. Design and Evaluation of a Visualization Method in a GIS for Complex Electronic Warfare Assessment with Regards to Usability

    University essay from Linköpings universitet/Interaktiva och kognitiva system

    Author : Susanna Dahlgren; [2019]
    Keywords : usability; HCI; design; evaluation; visualization; complex domain; GIS;

    Abstract : This study presents a way to design a visualization method in a geographic information system for complex electronic warfare assessment. Enhanced usability was in focus and the work covers important factors and challenges when evaluating usability during the development process in a complex domain. READ MORE

  2. 2. Design of a Maxwell Fish-Eye Lens in PCB Technology With a Glide-Symmetric Metasurface

    University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS); KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Author : Philip Arnberg; Oscar Barreira Petersson; [2019]
    Keywords : Maxwell fish-eye lens; unit cell; metasurface; glide symmetry.;

    Abstract : The aim of this project is to design a cost-effective planar Maxwell fish-eye lens in PCB technology operating at the center frequency 5 GHz with a bandwidth of 20 %. An approach to design a cost-effective lens is to use a metasurface, which is commonly realized as a periodic structure of unit cells. READ MORE

  3. 3. Propagation of Radio Waves in a Realistic Environment using a Parabolic Equation Approach

    University essay from Linköpings universitet/Teoretisk Fysik

    Author : Jonas Ehn; [2019]
    Keywords : Electromagnetic fields; wave propagation; radar; parabolic equation; split-step Fourier method;

    Abstract : Radars are used for range estimation of distant objects. They operate on the principle of sending electromagnetic pulses that are reflected off a target. This leads to the propagation of electromagnetic waves over large distances. As the waves propagate, they are affected by several aspects that decrease the performance of the radar system. READ MORE

  4. 4. 3D Printing a Maxwell Fish Eye Lens With Periodic Structures

    University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS); KTH/Skolan för elektroteknik och datavetenskap (EECS)

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

    Abstract : 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. READ MORE

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

    University essay from Luleå tekniska universitet/Institutionen för system- och rymdteknik

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

    Abstract : 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. READ MORE