Electrical and Information Technology

Faculty of Engineering, LTH

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PhD defence: Antenna System Design for 5G and Beyond – A Modal Approach

Hanieh Aliakbari
Hanieh Aliakbari. Photo: H. Mirhajian.


From: 2023-06-14 09:15 to 15:00
Place: E:1406, E-huset, Ole Römers väg 3, LTH, Lund University, Lund, and online
Contact: hanieh [dot] aliakbari_abar [at] eit [dot] lth [dot] se

Title: Antenna System Design for 5G and Beyond – A Modal Approach

Author: Hanieh Aliakbari, Department of Electrical and Information Technology, Lund University

Location: E:1406, E-huset, Ole Römers väg 3, LTH, Lund University, Lund.

Link to thesis.

Link to webinar (Zoom)



Today's society relies more and more on the communications of various contents, especially in the form of data, with wireless communications taking the center stage. The most common form of wireless communications, mobile communications, is changing people’s lives over the entire world. One example is the number of smartphone users that grows by hundreds of millions every year, many of whom do not previously have access to telephony or the many opportunities and conveniences it brings. Simultaneously, due to the popularity of bandwidth-hungry streaming video apps, the traffic generated by existing devices also increases by 30-40% annually. In addition, new wireless application areas are also emerging. For example, autonomous vehicles and drones must communicate with their surroundings to avoid collisions and other incidents. To support these different complex contents in wireless networks, higher data rates are needed.
Antenna is a critical component in wireless communications networks as it has the role of sending or receiving the aforementioned data as wireless signals over the air, which eliminates the need for wires. The wireless signals propagate through the medium or channel between the antennas at the transmitter and receiver in the form of electromagnetic waves. In my research, I utilized an antenna design paradigm based on modal methods to meet the antenna requirements for modern wireless systems and achieve higher data rates. Basically, in modal analysis, an antenna’s complex response is described by the weighted sum of multiple rather simpler responses called modes, with the modes being easier to characterize. This results in a more systematic design procedure, which is different from the traditional antenna design framework that mainly relies on intuition from past design experiences and blind numerical optimization of structural parameters.

Following the demand for ever increasing data rates, the antennas in mobile communication systems are required to provide more features and higher performance. One trend is to employ advanced multi-antenna technology to provide high data rates and link reliability. In this context, the first track of my research deals with some fundamental challenges of multi-antenna design for smartphones. The second trend to provide higher data rates for wireless communication is to move towards higher frequencies such as millimeter wave (mm-wave) bands in 5G due to the much larger bandwidths available in those bands than sub-6 GHz bands.  Therefore, the second track of my research investigates new concepts in integrated antennas for mm-wave wireless communications and/or radar systems using different modal theories.