Defence in the field of Radio Engineering, M. Sc. (Tech.) Jari-Matti Hannula

The title of thesis is “Advances in the Analysis and Design of Electrically Small Antennas”

The increasing number of wireless devices congests the available radio frequen-cies. To cope with this increasing demand, new frequencies are allocated to fu-ture communication technologies (5G). The challenge then is to design antennas that can also cover these new frequencies. The laws of physics already limit the obtainable antenna performance. Antenna designers should find new solutions to answer these future challenges.

This thesis introduces the concept of the antenna cluster, where the idea is to feed several different antenna elements simultaneously. The goal is to cover a wider range of frequencies than would be possible with a single antenna of the same size. The research started with a mathematical analysis on multifeed antennas, and lead to antenna prototypes implemented in mobile phone size, whose opera-tion was then experimentally characterized.

An antenna is converts a high-frequency signal in a conductor to an electromag-netic wave propagating freely in the air and vice versa. The actual signal genera-tion and detection in modern wireless devices is done with integrated circuits. The introduced antenna concept is investigated also from the perspective of these integrated circuits. Based on the results, the antenna concept is realizable with modern circuit technology. The results also provide new perspectives for antenna design.

Opponents: Professor Gert Pedersen, Aalborg University, Denmark and Professor Mats Gustafsson, Lund University, Sweden

Custos:  Professor Ville Viikari, Aalto University School of Electrical Engineering, Department of Electronics and Nanoengineering.

Thesis website
Notice of dissertation defence (pdf.)
Contact information: Jari-Matti Hannula, +358 50 467 7042, jari-matti.hannula@aalto.fi

Venue: Aalto University School of Electrical Engineering, hall T2, Konemiehentie 2, Espoo