Dissertation in the field of Radio Engineering, Vasilii Semkin
The title of thesis is ”Reconfigurable antennas and radio wave propagation at millimeter-wave frequencies”.
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Since the first wireless systems appeared, the data rates have dramatically in-creased. Fast evolution of wireless radio networks, as well as appearance of new devices, such as smartphones, tablets, and different accessories, bring new chal-lenges for researchers. In this thesis, two important topics are considered: antennas and pecularities of radio-wave propagation at millimeter-wave frequencies. Recon-figurable antennas, with the ability to vary their properties according to the changes in the environment, can help to improve overall system performance and increase the system capacity. Moreover, in order to effectively deploy high data rate millime-ter-wave communication systems, accurate information about radio wave propaga-tion channel is essential.
In the first part of the thesis, mechanically tunable (microfluidic) antennas operating at microwave frequencies, as well as conformal antenna arrays operating at millime-ter-wave frequencies, with the ability to reconfigure radiation characteristics are studied. Such antennas are of interest due to the ability to direct the beam towards the intended direction, which leads to power savings and improved signal to noise ratio.
The second part of the thesis deals with radio wave propagation modeling and channel measurements at millimeter-wave frequencies in urban and indoor envi-ronments. Different propagation mechanisms at millimeter-wave frequencies are investigated. For improved radio channel modeling, unmanned aerial vehicle and photogrammetry technique is used.
Opponent: Professor Lluís Jofre, Universitat Politècnica de Catalunya, Spain
Supervisor: Professor Antti Räisänen, Aalto University School of Electrical Engineering, Department of Radio Science and Engineering
Contact information:
Vasilii Semkin
vasilii.semkin@aalto.fi