Dr. Asimina Kiourti
ElectroScience Laboratory, Dept. of Electrical and Computer Engineering, The Ohio State University, Columbus, OH 43210, USA
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Academic Career Length
15Years (2012-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications24 January 2018 in IEEE Antennas and Wireless Propagation Letters
Journal Article
Roy B. V. B. SimorangkirAsimina KiourtiKEKaru P. Esselle
Karu P. EsselleA new flexible ultrawideband (UWB) antenna is presented for wearable applications in the 3.7-10.3 GHz band, which is highly tolerant to human body loading and physical deformation. The antenna exhibits a footprint of 80 mm × 67 mm and is based on a simple microstrip structure with two modified arc-shaped patches as the main radiator. A full ground plane is maintained on the opposite side of the substrate to suppress antenna loading from the underlying biological tissues and back radiation directed toward the human body. For enhanced flexibility and robustness, the proposed antenna is realized using conductive fabric embedded into polydimethylsiloxane polymer. Promising simulation and experimental results are presented for free-space and in-vitro wearable scenarios. To our knowledge, this is the first UWB antenna with a full ground plane that is concurrently highly tolerant to harsh operating conditions, such as those encountered in wearable applications.
31 August 2018 in IEEE Antennas and Propagation Magazine
Journal Article
Asimina Kiourti14 March 2018 in IEEE Journal of Electromagnetics, RF and Microwaves in Medicine and Biology
Journal Article
A radiating near-field method of recharging and activating medical implants using a 2.4-GHz rectifying patch antenna (rectenna) is designed and tested. Traditional near-field charging uses magnetically coupled coils, but these are highly sensitive to misalignments between the transmitter and receiver. In contrast, the proposed design employs the principles of wireless power transfer using radiating antennas. These antennas provide a misalignment-insensitive power delivery method, even when the receive antenna footprint is small (27.5 mm × 19.75 mm). A misalignment analysis is performed up to 15 cm, showing a maximum loss of 7.5 dB. As a proof-of-concept demonstration, a rectenna receiver was fabricated consisting of a patch antenna attached to a radio frequency (RF) rectifier. This integrated rectifier is a voltage quadrupling circuit that provides RF-DC rectification with efficiency of 40% at 0 dBm. For validation, a real-time actuation of a medical drug pump is demonstrated using only wirelessly transmitted power with no additional power storage elements.
24 March 2022 in IEEE Open Journal of Antennas and Propagation
Journal Article
Asimina KiourtiAAAmin Abbosh
Amin AbboshMAMaria Athanasiou
Maria AthanasiouTBToni Björninen
Toni BjörninenAEAline Eid
Aline EidKNKonstantina S. Nikita
Konstantina S. Nikita +11
Rapid advances in antennas, propagation, electromagnetics, and materials are opening new and unexplored opportunities in body area sensing and stimulation. Next-generation wearables and implants are seamlessly providing round-the-clock monitoring. In turn, numerous applications are brought forward with the potential to ultimately transform healthcare, sports, consumer electronics, and beyond. This review paper provides a comprehensive overview, discusses challenges and opportunities, and indicates future directions for: (a) enabling technologies needed to make body area sensing and stimulation a reality, and (b) emerging bioelectromagnetics applications that may readily benefit from such technologies.
18 December 2019 in Bioelectromagnetics
Journal Article
KGKatrina Guido
Katrina GuidoAsimina KiourtiWireless wearable and implantable devices are continuing to grow in popularity, and as this growth occurs, so too does the need to consider the safety of such devices. Wearable and implantable devices require the transmitting and receiving of electromagnetic waves near and through the body, which at high enough exposure levels may damage proximate tissues. The specific absorption rate (SAR) is the quantity commonly used to enumerate exposure levels, and various national and international organizations have defined regulations limiting exposure to ensure safe operation. In this paper, we comprehensively review dosimetric studies reported in the literature up to the year 2019 for wearables and implants. We discuss antenna designs for wearables and implants as they relate to SAR values and field and thermal distributions in tissue, present designs that have made steps to reduce SAR, and then review SAR considerations as they relate to applied devices. As compared with previous review papers, this paper is the first review to focus on dosimetry aspects relative to wearable and implantable devices. Bioelectromagnetics. 2020;41:3–20 © 2019 The Authors. Bioelectromagnetics published by Wiley Periodicals, Inc.
24 September 2018 in IEEE Antennas and Wireless Propagation Letters
Journal Article
SASaad Alharbi
Saad AlharbiSCShreyas Chaudhari
Shreyas ChaudhariAIAbdullahi Inshaar
Abdullahi InshaarHSHamil Shah
Hamil ShahCZChengzhe Zou
Chengzhe ZouAsimina Kiourti +1
We present a new class of reconfigurable origamibased antennas formed by embroidered conductive E-threads. State-of-the-art techniques used to realize origami antennas employ fragile conductive inks and/or copper tape. By contrast, the proposed approach brings forward enhanced robustness and durability as attributed to the inherent strength of the E-threads. To facilitate folding along the creases while also providing Radio-Frequency (RF) performance close to that of copper, a graded embroidery process is proposed. The grading scheme uses a density of 7 E-threads/mm on the antenna and a reduced density around the creases (as few as 1 E-thread/mm in this study). Proof-of-concept results for an accordion-based dipole antenna tunable from 760 to 1015 MHz show excellent agreement between simulations and measurements for all E-textile prototypes and the copper equivalent. Notably, embroidery density at the creases can be reduced to as low as 1 E-thread/mm without apparent degradation in the RF performance. Overall, the E-textile origami antennas may transform opportunities for reconfigurable antennas to be leveraged in wearable and structural applications.
About Me
Prof. Asimina Kiourti is an Associate Professor in the Department of Electrical and Computer Engineering at The Ohio State University, where she leads the Wearable and Implantable Technologies group. Previously, she served as a Postdoctoral Researcher, and then as a Senior Research Associate at Ohio State’s ElectroScience Laboratory from 2013 to 2016, and as an Assistant Professor from 2016 to 2022. Prior to that, she received her Ph.D. in Electrical and Computer Engineering from the National Technical University of Athens, Greece (2013) and her M.Sc. degree from University College London, UK (2009). Prof. Kiourti’s research interests include wearable and implantable sensors, antennas and electromagnetics for body-area applications, and flexible textile-based electronics. Her work has been recognized with over 40 scholarly awards, including the 2023 IEEE Lot Shafai Mid-Career Distinguished Achievement Award, the 2022 Ohio State Early Career Distinguished Scholar Award, the 2021 NSF CAREER award, and the 2021 "40 Under 40" recognition by Columbus Business First. Prof. Kiourti is a Senior Editor for the IEEE Transactions on Antennas and Propagation and Editor of the IEEE Antennas and Propagation Magazine “Bioelectromagnetics” column. She also serves in several elected and appointed roles in the IEEE, USNC-URSI, and ACES.