Information Technology and Electrical Engineering Doctoral Programme
Infotech Oulu Lecture Series
Lecturer: Prof. Hitoshi Ohsato, Nagoya Institute of Technology (NIT) and Nagoya Industrial Science Research Institute (NISRI), Japan (now visiting at Microelectronics Research Unit, University of Oulu)
Date: January 24, 2017
Time: 9:15 (3 x 45 minutes)
Resonators and filters in mobile and high data transfer wireless telecommunication’s devices operating at microwave/millimeter-wave area need extremely high Q. In this presentation, origins of dielectric losses are presented based on the crystal structure, and as examples of microwave and millimeter-wave dielectrics, pseudo-tungstenbronze type Ba6-3xR8+3xTi18O54 (R = rare earth) solid solutions and indialite/cordierite Mg2Al4Si5O18 glass ceramics are presented, respectively. Also, effects of order-disorder phase transformation of complex perovskite are discussed.
I. Properties of microwave/millimeter-wave dielectrics
II. Microwave dielectrics
- Example: Tungstenbronze-type solid solutions
III. Millimeter-wave dielectrics
- Example: Indialite/cordierite glass ceramics
(1) Hitoshi OHSATO: “Chapter 9: Microwave Dielectrics with Perovskite-Type Structure”, in "Perovskite Materials - Synthesis, Characterization, Properties, and Applications", Edited by Likun Pan and Guang Zhu, pp 281-330, INTEC, ISBN 978-953-51-4587-5, Rijeka, Croatia, 2016.Open access Book (Free), http://cdn.intechopen.com/pdfs-wm/49723.pdf
(2) Hitoshi OHSATO "Chapter 5: Millimeterwave materials", “Microwave Materials and Applications”, Editors: M T Sebastian, Rick Ubic and H. Jantunen, John Wiley. This will be published this month.
More information: Heli Jantunen
Last updated: 1.2.2017