A LTCC Material with Low Temperature Coefficient of Resonance Frequency

Abstract:

For high frequency packaging applications, LTCC materials are required to have a low loss tangent to reduce the total microwave loss. For multi-layered ceramic devices with embedded passive components, besides a loss tangent, a small temperature coefficient of resonance frequency (TCF) is an important factor. To meet these demands, we developed a new LTCC material with a smaller TCF, less than +/-3ppm/oC, and a low loss tangent, 0.0012 at 15GHz. We designed the glass composition to precipitate two low-loss crystal phases during firing at 900 oC. One phase has a plus TCF and the other phase has a minus TCF. We also controlled the amount of the two crystal phases, so these crystal phases and the fixed amount of alumina filler make the sum of TCF for the LTCC material close to zero.

• Periodical: Key Engineering Materials (Volume 301)
• Pages: 105-108
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.301.105
• Online since: January 2006
• Authors: Masaru Iwao, Yoshio Umayahara, Kazuyoshi Shindo
• Keywords: Crystallization, Loss Tangent, LTCC, TCF, X-Ray Diffraction (XRD)

References

[1] Soren Norlyng An Overview of Integrated Component Technologies, Advancing Microelectronics Vol. 30 No. 3 (2003).

[2] Handbook of Ceramics 2nd Edition (2002), p.1019 The Ceramic Society of Japan.

[3] B.W. Hakki and P.D. Coleman, A Dielectric Resonator Method of Measuring Inductive Capacities in the Millimeter Range, IRE Trans., Microwave Theory Tech., MTT-8, (1960), pp.402-410.

DOI: 10.1109/tmtt.1960.1124749

[4] Japanese Industrial Standard Testing method for dielectric properties of fine ceramics at microwave frequency, R 1627-1996 e-mail: miwao@neg. co. jp Phone: [phone], Fax: [phone].

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[10] 000. 00 5. 00 10. 00 15. 00 20. 00 TiO 2 content (m ol%) K 0.

DOI: 10.7717/peerj.10041/table-2

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002 Loss tangent K Loss Fig. 7. Dielectric constant (K) and Loss tangent as a function of TiO2 content. New LTCC Anorthite LTCC 280 280.

[8] 1 6. 0 K 9. 1 7. 6 Loss tangent 0. 0012 0. 0047 TCF ppm/ o C 2. 9 -38. 0 Bending Strength (MPa) TCE (ppm/ o C) 15GHz Table 2. Properties of New LTCC.