L
Leena Ukkonen
Researcher at University of Tampere
Publications - 357
Citations - 6556
Leena Ukkonen is an academic researcher from University of Tampere. The author has contributed to research in topics: Antenna (radio) & Radio-frequency identification. The author has an hindex of 39, co-authored 350 publications receiving 5584 citations. Previous affiliations of Leena Ukkonen include City University of Hong Kong & Tampere University of Technology.
Papers
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Journal ArticleDOI
Inkjet-Printed Humidity Sensor for Passive UHF RFID Systems
TL;DR: The humidity sensor presented in this paper is one of the first passive UHF RFID humidity sensor tags fabricated using inkjet technology and the structure and operation principle of the sensor tag are described as well as the method of performing humidity measurements in practice.
Journal ArticleDOI
Effects of metallic plate size on the performance of microstrip patch-type tag antennas for passive RFID
TL;DR: In this article, the effects of metallic plate size on the performance of microstrip patch-type tag antennas were analyzed based on finite element method (FEM) simulations and practical read-range measurements.
Journal ArticleDOI
Screen-Printing Fabrication and Characterization of Stretchable Electronics
Jari Suikkola,Toni Bjorninen,Mahmoud Mosallaei,Timo Kankkunen,Pekka Iso-Ketola,Leena Ukkonen,Jukka Vanhala,Matti Mäntysalo +7 more
TL;DR: The fabricated interconnects were screen-printed with a stretchable silver-polymer composite ink on 50-μm thick thermoplastic polyurethane and withstood single strains of up to 74%.
Journal ArticleDOI
Chip Impedance Matching for UHF RFID Tag Antenna Design
Chye-Hwa Loo,Khaled ElMahgoub,Fan Yang,Atef Z. Elsherbeni,Darko Kajfez,Ahmed A. Kishk,Tamer Elsherbeni,Leena Ukkonen,Lauri Sydanheimo,Markku Kivikoski,Sari Merilampi,Pekka Ruuskanen +11 more
TL;DR: In this article, a proper calculation of the tag power reflection coefficient for maximum power transfer by taking into account of the changing chip impedance versus frequency is presented, where the chip impedance in each state varies with the frequency and the input power.
Proceedings ArticleDOI
Folded dipole antenna near metal plate
TL;DR: In this paper, a folded dipole antenna is used and placed symmetrically above a metal plate to simulate the dependency of antenna parameters on the size of the plate, and the distance between the plate and the antenna.