Microwave/millimeter-wave dielectrics research developed by the crystallography

24.1.2017 09:15

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)
Room: TS3110


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