Apostolos Georgiadis was born in Thessaloniki, Greece. He received the B.S. degree in physics and the M.S. degree in telecommunications from the Aristotle University of Thessaloniki, Greece, in 1993 and 1996, respectively. He received the Ph.D. degree in electrical engineering from the University of Massachusetts, Amherst, in 2002. In 2002 he joined Global Communications Devices (GCD), North Andover, MA, USA, as a Systems Engineer and worked on CMOS transceivers for wireless network applications. In June 2003, he joined Bermai, Inc., Minnetonka MN USA, as an RF/Analog Systems Architect. In 2005 he joined the University of Cantabria, Spain, as a Juan de la Cierva Fellow researcher. In March 2007 he joined CTTC as a senior researcher associate in the area of Communications Subsystems. Since Apr 2013 he is group leader of the Microwave Systems and Nanotechnology Department of CTTC.
His research interests are energy harvesting and wireless power transfer, inkjet printed RF electronics, active microwave circuits and active antenna arrays. Dr. Georgiadis was the Chair of 2011 IEEE RFID-TA Conference and of the 2011 IEEE MTT-S IMWS on Millimeter Wave Integration Technologies. He was the Chair of EU COST Action IC0803 RF/Microwave communication subsystems for emerging wireless technologies (RFCSET) and he is presently Vice-Chair of EU COST Action IC1301 Wireless Power Transmission for Sustainable Electronics (WiPE). He is Member of the IEEE MTT-S TC-24 RFID Technologies (past Chair) and Member of IEEE MTT-S TC-26 Wireless Energy Transfer and Conversion. He is Vice-Chair of URSI Commission D. He is a Distinguished Lecturer of IEEE CRFID. He serves as an Associate Editor of the IEEE Microwave and Wireless Components Letters, the IET Microwaves Antennas and Propagation Journals and the IEEE RFID Virtual Journal.
The presentation begins with an overview of energy considerations and challenges for low power system requirements in emerging applications such as health and smart homes, environmental monitoring, as well as an outlook of various energy harvesting technologies. The state-of-the-art in commonly used energy harvesting technologies such as solar, piezoelectric, thermal and electromagnetic is then presented. Figures of merit are provided and emphasis is placed on design challenges and novel technologies and materials, such as paper, textiles, inkjet printing.
Special focus is placed on hybrid–multiple technology harvesters leading to the development of low profile and conformal solar antennas and solar–electromagnetic harvesters. Design and optimization challenges are provided. Nonlinear circuit optimization combined with electromagnetic analysis is used to optimize circuit performance, and design methodologies for ultra-wideband and multiband RF energy harvesters are presented. Continued interest in electromagnetic energy harvesting is attributed to the minimum additional cost associated with its implementation due to existing antenna modules on wireless sensor nodes and RFIDs, as well as due to the capability for powering of wireless devices by intentional radiation known as wireless power transmission. The latter is addressed and novel system concepts such as transmission of chaotic signals for optimum performance are proposed. Circuit and system examples of autonomous system operation are demonstrated such as wirelessly powered sensors, beacon signal generators, energy harvesting applied to RFID systems. Finally, future perspectives and challenges are discussed in terms of energy storage, materials, and circuit performance and application scenarios.