Sökning: "Antenn"

Visar resultat 1 - 5 av 81 uppsatser innehållade ordet Antenn.

  1. 1. Jämförelse av antenners beteende under vibration

    Kandidat-uppsats, KTH/Skolan för teknikvetenskap (SCI)

    Författare :Matilda Dickman Ekvall; [2022]
    Nyckelord :antenn; vibration; resonans;

    Sammanfattning : Vibrationer i underlaget kan försämra prestandan hos kommunikationsantenner. Detta har undersökts i denna rapport.  Tre sändarantenner med olika utseende och egenskaper genomgick flera vibrationstester för att identifiera resonansfrekvenser i strukturen. LÄS MER

  2. 2. Far-field pattern synthesis of transmitarray antennas using convex optimization techniques

    Master-uppsats, KTH/Tillämpad fysik

    Författare :Marie Defives; [2022]
    Nyckelord :Applied physics; Transmitarray antennas; convex optimization; Tillämpad fysik; Transmitarray-antenner; konvex optimering;

    Sammanfattning : Transmitarrays antennas (TAs) can be seen as the planar counterpart of optical lenses. They are composed of thin radiating elements (unit cells) which introduce different local phase shifts on an incident electromagnetic wave, emitted by a primary source, and re-radiate it. LÄS MER

  3. 3. Conceptual design of an electronic dockingstation and positioner for portable antenna

    Master-uppsats, KTH/Maskinkonstruktion (Inst.)

    Författare :Otto Egeman; Karl Westling; [2022]
    Nyckelord :Antenna; Automatic positioner; Geostationary; Docking station; Antenn; Automatisk inpekning; Geostationär; Dockningsstation;

    Sammanfattning : The presented work in this report is a master’s thesis at the machine design track at KTH Royal Institute of Technology. The work was commissioned by Ovzon through Svea Teknik AB. The T6 antenna in Ovzons antenna terminal portfolio is as of now fully manual in terms of positioning against satellites. LÄS MER

  4. 4. Improving deep learning assistedfar-field electromagnetic sidechannelattacks on AES : Effects on attack efficiency from using additive noise and otherdata augmentation techniques

    Master-uppsats, KTH/Mekatronik

    Författare :Axel Zedigh; [2022]
    Nyckelord :;

    Sammanfattning : Profiled side-channel attacks on hardware implemented cryptographic algorithms have been a well-researched topic for the past two decades and many countermeasures against these attacks have been proposed and adopted by the industry. Recently, a new form of far field EM side channel called "screaming channel attacks" have been highlighted. LÄS MER

  5. 5. Portable HF Antennas for Concurrent Multiband Systems

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

    Författare :Sambhav Malhotra; [2022]
    Nyckelord :Antenna; HF; Skywave Propogation; Multiband;

    Sammanfattning : Current HF communication systems are confined to transmit in relatively narrow frequency band of a few 100 kHz at the time. The problems with limited bandwidth accumulate in HF-networks with multiple links and such networks are therefore hardly “internet capable” today. LÄS MER