University of Oulu

S. Myllymäki, M. Väätäjä, G. Omodara, H. Kähäri, J. Juuti and H. Jantunen, "Characterization of Li₂MoO₄/BaTiO₃ All-Ceramic Films on Organic Substrate Printed Capacitors at 45 MHz–10 GHz," in IEEE Transactions on Dielectrics and Electrical Insulation, vol. 29, no. 2, pp. 354-361, April 2022, doi: 10.1109/TDEI.2022.3157913.

Characterization of Li₂MoO₄/BaTiO₃ all-ceramic films on organic substrate printed capacitors at 45 MHz–10 GHz

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Author: Myllymäki, Sami1; Väätäjä, Maria1; Omodara, Gbotemi1;
Organizations: 1Microeletronics Research Unit, University of Oulu, 90014 Oulu, Finland
2Nokia Corporation, Espoo, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 4 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2022060141600
Language: English
Published: Institute of Electrical and Electronics Engineers, 2022
Publish Date: 2022-06-01
Description:

Abstract

This article presents novel all-ceramic composite films used as a screen-printed capacitors on polymer surface and their characterization at 45-MHz to 10-GHz frequency range. All-ceramic composite paste is based on lithium molybdate (Li₂MoO₄), barium titanate (BaTiO₃), and water manufactured by the room temperature fabrication (RTF) method. For the determination of the permittivity and the loss tangent of the materials, ceramic thick films are printed on the top of an interdigital-shaped microwave capacitors using pastes with 0, 10, and 20 vol.% of BaTiO₃ filler in Li₂MoO₄ followed by a drying process at 120 °C. The electrical properties of the capacitors, capacitance, and quality value are derived from measured S-parameter results, whereas the electrical properties of the ceramic thick-film materials, real, and imaginary values of permittivity are derived from the measured results through computer simulations. The electrical properties of the ceramic material, such as moderate permittivity and moderately low-loss tangent, could be adjusted by changing the volume fraction of the BaTiO₃ filler to match the demands of different areas of applications. The obtained results are verified with five samples of each ceramic composition. The results show the capacitance values of 0.30 pF for an uncoated capacitor and 0.55, 0.67, and 0.95 pF with coatings of Li₂MoO₄ with 0, 10, and 20 vol.% of BaTiO₃ composites, respectively, at 2.5-GHz frequency. The calculated relative permittivity (εr) values for the same materials are 3.70, 5.23, and 6.43, and loss tangent values are 0.035, 0.027, and 0.036 at 2.5 GHz. These novel all-ceramic capacitor composite materials are applicable for the RF components used in telecommunication applications in the frequency range of 45 MHz–10 GHz, thus widening the technology roadmap in terms of material choices for different applications, especially high thermal resistant materials.

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Series: IEEE transactions on dielectrics and electrical insulation
ISSN: 1070-9878
ISSN-E: 1558-4135
ISSN-L: 1070-9878
Volume: 29
Issue: 2
Pages: 354 - 361
DOI: 10.1109/TDEI.2022.3157913
OADOI: https://oadoi.org/10.1109/TDEI.2022.3157913
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Subjects:
Funding: This work was supported in part by the European Research Council (ERC) through the European Union’s Seventh Framework Program (FP7/2007–2013)/ERC under Agreement 291132, in part by ERC POC under Project 812837, in part by the Academy of Finland Research Infrastructure “Printed Intelligence Infrastructure” (PII-FIRI) under Grant 320017, and in part by the Academy of Finland 6Genesis Flagship under Grant 318927. M.Väätäjä gratefully acknowledges Infotech Oulu Doctoral Program, the Finnish Foundation for Technology Promotion, the Riitta and Jorma J. Takanen Foundation, the Walter Ahlström Foundation, and the Tauno Tönning Foundation.
EU Grant Number: (291132) ULTIMATE CERAMICS - Printed Electroceramics with Ultimate Compositions
Academy of Finland Grant Number: 320017
318927
Detailed Information: 320017 (Academy of Finland Funding decision)
318927 (Academy of Finland Funding decision)
Copyright information: This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/
  https://creativecommons.org/licenses/by/4.0/