Sökning: "trådlöst"

Visar resultat 1 - 5 av 11 avhandlingar innehållade ordet trådlöst.

  1. 1. Antenna Analysis and Design Using Stored Energies and Physical Limitations

    Författare :Marius Cismasu; Institutionen för elektro- och informationsteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : A method to estimate Q and QZ' of antennas from single-frequency current distributions is described. This single-frequency method and the concepts of physical bounds on antenna parameters and optimum current distributions are applied to different analysis and design situations of two-dimensional and three-dimensional radiating structures (i.e. LÄS MER

  3. 2. Wirelessly Powered Communications: From Signal Optimization to Antenna Design

    Författare :Boules Atef Nessim Mouris; Ragnar Thobaben; Aggelos Bletsas; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wireless power transfer; multi-tone signals; non-linear energy harvester; wirelessly powered sensors; joint source-channel coding; analog mappings; energy scheduling; mutual coupling reduction; electromagnetic bandgap; glide symmetry.; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : Future internet-of-things (IoT) and beyond 5G communication systems are envisioned to offer large-scale wireless connectivity where the different components of life, society and industry are connected in a smart yet sustainable way. The need for continuous battery charging and/or replacement is a bottleneck for sustainability in these systems. LÄS MER

  4. 3. Engineering through Designerly Conversations with the Digital Material : The Approach, the Tools and the Design Space

    Författare :Jordi Solsona Belenguer; Kristina Höök; Anna Vallgårda; KTH; []
    Nyckelord :Human-computer Interaction; Människa-datorinteraktion;

    Sammanfattning : The role of IT devices and technology in our everyday lives is growing. The commercial availability of sensor and wireless communications technologies has led to an increase in the number of systems utilizing these to provide compelling experiences. LÄS MER

  5. 4. Electron Tunneling and Field-Effect Devices in mm-Wave Circuits

    Författare :Mikael Egard; Fasta tillståndets fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; negative differential conductance oscillator; resonant tunneling diode; ultra-wideband; impulse radio; Wavelet generator; MOSFET; nanowire; high frequency characterization; Fysicumarkivet A:2012:Egard;

    Sammanfattning : Short high-frequency electromagnetic pulses, also referred to as wavelets, are considered for use in various short-range impulse based ultra-wideband applications, such as communication, imaging, radar, spectroscopy, and localization. This thesis investigates field-effect and tunneling based semiconductor devices and their operation in millimeter-wave (mm-wave) impulse transceivers. LÄS MER

  7. 5. Wearable Pedobarography System for Monitoring of Walk Related Parameters

    Författare :Per Anders Rickard Hellström; Mia Folke; Martin Ekström; Ning Xiong; Helena Grip; Mälardalens högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; elektronik; Electronics;

    Sammanfattning : Health care costs have increased over the last decades due to an ageing population. Therefore, research in personal health monitoring (PHM) has increased in response to this. LÄS MER