Defence of doctoral thesis in the field of Radio Engineering, M.Sc.(Tech.) Sabin Karki
M.Sc.(Tech.) Sabin Karki will defend the thesis "Beam-switching antennas for millimeter-wave communications" on 22 October 2021 at 12 (EET) in Aalto University School of Electrical Engineering, Department of Electronics and Nanoengineering.
Opponent: Prof. Fabien Ferrero, Université Côte d'Azur, France
Custos: Prof. Ville Viikari, Aalto University School of Electrical Engineering, Department of Electronics and Nanoengineering
The public defense will be organized via remote technology. Follow defence: https://aalto.zoom.us/j/69423687312
Zoom Quick Guide: https://www.aalto.fi/en/services/zoom-quick-guide
Thesis available for public display at: https://aaltodoc.aalto.fi/doc_public/eonly/riiputus/
Doctoral theses in the School of Electrical Engineering: https://aaltodoc.aalto.fi/handle/123456789/53
The communication systems are moving towards millimeter-wave i.e., 30 GHz to 300 GHz frequency range in quest of larger bandwidth and consequently higher throughput. At millimeter-wave frequencies, the antennas are required to have high gain and the ability for wide-angle scanning. The antennas based on beam-switching topology can achieve high gain and steer the beams with fewer feed lines and active components as compared to phased array antennas. The research aims to make the integrated lens antenna low profile, minimize scan loss, and improve efficiency. In addition, the feeding network of the beam-switching antenna is studied to understand the impact of the feed array coupling, to achieve beam reconfigurability, and to mitigate insertion loss in the switching network.
The work introduces the integrated metal-lens antenna that reduces the focal length of the ILA and improves efficiency. The radiation pattern tilting of the feed antennas is proposed to minimize the scan loss of an ILA. Another investigated antenna is the dual-spherical lens which demonstrates a wide beam steering range with inherently negligible scan loss. The switching network based on a vector modulator is proposed to overcome the insertion loss and enable beam-reconfigurability with the beam-switching antennas.
The outcomes of the research will help in the development of low-cost and power-efficient antenna solutions that meet the high gain and wide beam steering requirements.
Contact information of doctoral candidate