Search for dissertations about: "Planar Antennas"
Showing result 21 - 25 of 41 swedish dissertations containing the words Planar Antennas.
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21. Studies of Three Different Methods to Estimate the Up-link Performance of Mobile Phone Antennas
Abstract : Antennas play an important role in determining the overall radio performance for wireless communications. If all other radio components perform according to their specifications, the performance of a mobile phone can be entirely determined by measuring the efficiency of its antenna. READ MORE
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22. Design, Fabrication and Characterization of Microwave Passive Devices on Liquid Crystal Polymer Substrates
Abstract : For microwave/millimeter (mm)-wave systems’ applications, as frequency is moving towards higher and higher bands, materials and integration technologies are witnessing higher performance demands and constraints. The materials presently used as mm-wave substrates are either expensive or show unsatisfactory performance. READ MORE
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23. Antenna Integrated Superconducting Mixers
Abstract : This thesis investigates the prospects of some different superconducting mixers integrated with planar antennas for the millimeter and submillimeter regime. Two kinds of Superconductor/Insulator/Superconductor (SIS) tunnel junctions for use in mixers have been fabricated; Nb/PbBi edge junctions and Nb trilayer junctions. READ MORE
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24. Towards Gap Waveguide Array Antenna for Millimeter Wave Applications
Abstract : The millimeter wave frequency range has got a lot of attention over the past few years because it contains unused frequency spectrum resources that are suitable for delivering Gbit/s end-user access in areas with high user density. Due to the limited output power that current RF active components can deliver in millimeter waves, antennas with the merits of low profile, high gain, high effciency and low cost are needed to compensate free space path loss and increase the communication distance for the emerging high data rate wireless systems. READ MORE
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25. Sparse Array Synthesis of Complex Antenna Elements
Abstract : Arrays of antennas can significantly improve the performances and extend the capabilities of single-element antennas. However, antenna arrays are expensive solutions and therefore it is critical to keep the costs to a minimum. READ MORE