Ville Viikari is currently a Professor and Head of Department with the Aalto University School of Electrical Engineering, Espoo, Finland. From 2001 to 2007, he was with the Radio Laboratory, TKK (now part of Aalto University), where he studied antenna measurement techniques at submillimeter wavelengths and antenna pattern correction techniques. From 2007 to 2012, he was a Research Scientist and a Senior Scientist with the VTT Technical Research Centre, Espoo, Finland, where his research included wireless sensors, RFID, radar applications, MEMS, and microwave sensors. He was appointed an Assistant Professor at Aalto University in 2012. He has authored or co-authored more than 110 journal papers and 110 conference papers. He is an inventor in 16 granted patents. His current research interests include antennas for mobile devices and networks, antenna clusters and coupled arrays, active antennas, and antenna measurement techniques.