Public defence in Radio Engineering, M.Sc. Quangang Chen

The title of the thesis: Multi-band 5G Antenna Designs for Smartphones

Doctoral student: Quangang Chen
Opponent: Prof. Shuai Zhang, Aalborg University, Denmark
Custos: Prof. Ville Viikari, Aalto University School of Electrical Engineering, Department of Electronics and Nanoengineering

Mobile communication has evolved significantly since the introduction of the first-generation (1G) mobile network which can only support voice call with data transmission rates of Kbps. Nowadays, the current fifth generation (5G) boasts the data rates in Gbps and facilitates high-definition video call. In tandem with these advancements, the design of handset antennas, serving as pivotal components for wireless signal transmission and reception, has also undergone remarkable changes. 

With the ongoing development of communication technology, more and more frequency bands are being allocated. A noteworthy distinction between 5G and previous generations is the use of millimeter-wave (mm-wave) frequencies, providing a much wide bandwidth to support high data capacity. Additionally, different regions around the world may adopt distinct frequency spectrum for their mobile networks. As a result, the international telecommunication originations have designated multiple frequency bands between 700 MHz and 44 GHz for mobile communications. For the antenna design of modern smartphones, it is essential to cover the required multiple frequency bands. 

This work presents several antenna designs for 5G smartphones operating in the sub-6 GHz and the mm-wave frequency bands. The antenna design takes into account the specific requirements for handsets, such as low profile, compact size, ease of production, and the attractive metallic-chassis of the smartphones. The designed antennas are also compatible with the state-of-the-art requirements for 5G communication, including beamforming capability, Multiple-Input Multiple-Output (MIMO) technology, and dual-polarization.

Thesis available for public display 10 days prior to the defence at: https://aaltodoc.aalto.fi/doc_public/eonly/riiputus/

Doctoral theses in the School of Electrical Engineering: https://aaltodoc.aalto.fi/handle/123456789/53