University of Oulu

O. Gbotemi et al., "Characterization of PMMA/BaTiO3 Composite Layers Through Printed Capacitor Structures for Microwave Frequency Applications," in IEEE Transactions on Microwave Theory and Techniques, vol. 66, no. 4, pp. 1736-1743, April 2018. doi: 10.1109/TMTT.2017.2781694

Characterization of PMMA/BaTiO₃ composite layers through printed capacitor structures for microwave frequency applications

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Author: Gbotemi, Omodara1; Myllymäki, Sami1; Kallioinen, Jani2;
Organizations: 1Microelectronics Research Unit, University of Oulu, Oulu, Finland
2Tioxide Europe Ltd.
3Jožef Stefan Institute, Ljubljana, Slovenia
4Department of Silicon Technonoly, Institute of Electronic Materials Technology, 01-919 Warsaw, Poland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 2.1 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2018
Publish Date: 2020-03-20


This paper presents the extraction of microwave properties of low-temperature cured inorganic composite materials based on barium titanate (BaTiO 3 ). These composite materials exhibit attractive features such that when the volume fraction of the filler contents varied, its electrical properties of high permittivity and moderately low loss tangent can be manipulated to suit different areas of applications. For the extraction of the permittivity and the loss tangent, three different ink particles were developed and printed on the top of interdigital-shaped microwave capacitor. The properties of the inks were extracted from measured results through computer simulations. The obtained results were verified with several types of interdigital capacitor structures of different fingers and linewidths. The effect of the thickness of the ink layer materials on the top of the capacitor structures was likewise investigated. The results show relative permittivity (εr ) values of 30, 25, and 27 for composite layers printed using inks with Pr. A shape at 67.4 wt% (percentage by weight), Pr. B shape at 66.3 wt%, and Pr. C shape at 67.1 wt% of BaTiO3, respectively, at 2 GHz. Corresponding loss tangents (tan δ) were 0.065, 0.040, and 0.025. The dielectric properties of the composite materials are influenced by the thickness variation of the ink layers on the capacitor structures. This novel capacitor composite materials would be a promising candidate for printed application in mobile telecommunication operations, especially in the frequency range of 0.5–3 GHz.

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Series: IEEE transactions on microwave theory and techniques
ISSN: 0018-9480
ISSN-E: 1557-9670
ISSN-L: 0018-9480
Volume: 66
Issue: 4
Pages: 1736 - 1743
DOI: 10.1109/TMTT.2017.2781694
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work was supported in part by Tekes, Finland, in part by Sachtleben Pigments Oy, Finland, in part by Pulse Finland Oy, Finland, in part by NOF Corporation Japan, and in part by the Academy of Finland under Grant 267573 and Grant 273663.
Academy of Finland Grant Number: 267573
Detailed Information: 267573 (Academy of Finland Funding decision)
273663 (Academy of Finland Funding decision)
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