Defence of doctoral thesis in the field of Radio Engineering, M.Sc.(Tech.) Rasmus Luomaniemi

The title of the thesis is Adaptive Multiport Antennas for Handsets

M.Sc.(Tech.) Rasmus Luomaniemi will defend the thesis "Adaptive Multiport Antennas for Handsets" on 21 June 2021 at 16 (EET) in Aalto University School of Electrical Engineering, Department of Electronics and Nanoengineering.

Opponent: Prof. Mohammad Sharawi, Polytechnique Montreal, Canada
Supervisor: 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:
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Thesis available for public display at:

Doctoral theses in the School of Electrical Engineering:

Press release:

Although the features of smartphones have increased significantly in the last few years, due to, for example, increased computational capacity and new camera and screen technologies, antennas are one area where this kind of development has not been possible. Most of the services used with smartphones nowadays are based on wireless data transfer. Still, the general trends of a large touchscreen, covering almost the full front face of the device, and wider frequency bands and a large number of different communication systems make the realization of antenna systems with high efficiency more and more difficult. For antenna designers to be able to meet the future challenges and develop better antenna systems, new techniques are needed.

This dissertation develops multiport antenna techniques that can meet these increasingly difficult goals. The use of multiple active feeding ports offers new design parameters and degrees of freedom that can be utilized for improving the antenna performance. Several new design methods, and antenna systems designed with these new methods, for current smartphones and future smart devices are introduced. In addition to enabling finding new and innovative antenna solutions, these methods are computationally efficient, thus, accelerating the design process.

In addition, multiport techniques can be used to adapt the operation of the antennas for changes in the operation environment, for example, to reduce the effect of the user holding the device. The negative effect of the user is one of the main problems with traditional antenna solutions that the users can also notice as slower data transfer rates. This work also introduces a new antenna system that is almost completely immune to the effect of the user’s hand.

Contact information of doctoral candidate

Email [email protected]
Phone +358405340895
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