Marko Sonkki received his Master's degree (M.Sc.) in Electrical Engineering from the Department of Electrical and Information Engineering at the University of Oulu, Finland, in 2004. His Master’s thesis was related to a measurement transmitter for adaptive antennas. In 2013, he received his Doctoral of Science degree (D.Sc.) in Radio Telecommunications Engineering at the University of Oulu, Finland. The topic of the dissertation was wideband and multi-element antennas for wireless applications, focusing on antenna design based on spherical and characteristic mode theories. He is currently working in the private sector and in cooperation as a post-doctoral researcher with the Centre for Wireless Communications (CWC) at the Faculty of Information Technology and Electrical Engineering (ITEE), University of Oulu. His current research interests are the design and analysis of wideband antennas, wideband multi-mode and full-duplex antennas, and antenna arrays including millimeter waves.