On the Temperature Coefficient of Resonant Frequency in Microwave Dielectrics

I. M. Reaney; P. Wise; R. Ubic; J. Breeze; N. Mcn Alford; D. Iddles; D. Cannell; T. Price

doi:10.1080/01418610108214318

On the Temperature Coefficient of Resonant Frequency in Microwave Dielectrics

I. M. Reaney, P. Wise, R. Ubic, J. Breeze, N. Mcn Alford, D. Iddles, D. Cannell, T. Price

Micron School of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

121 Scopus citations

Abstract

Developing a material with a temperature coefficient of the resonant frequency (TCF) of zero is probably the most difficult aspect of research into microwave dielectric ceramics. There are a host of high-quality-factor (Q) high-relative-permittivity (ϵ_r) materials whose TCF is far too high to be usable, notably TiO₂(ϵ_r= 104; Q = 14000 at 3GHz: TCF = +427 ppm K⁻¹). The challenge is to find ways of tuning TCF while maintaining values of ϵ_rand Q suitable for use in microwave components. This paper explains, in terms of octahedral tilting and ϵ_rdilution, the tunability of TCF or, more precisely, the temperature coefficient of ϵ_rin Ca and Sr titanate-based ceramics. Examples of the structural changes that occur during tuning are also shown.

Original language	American English
Pages (from-to)	501-510
Number of pages	10
Journal	Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
Volume	A81
Issue number	2
DOIs	https://doi.org/10.1080/01418610108214318
State	Published - Feb 2001

EGS Disciplines

Materials Science and Engineering

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10.1080/01418610108214318

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abstract = "Developing a material with a temperature coefficient of the resonant frequency (TCF) of zero is probably the most difficult aspect of research into microwave dielectric ceramics. There are a host of high-quality-factor (Q) high-relative-permittivity (ϵr) materials whose TCF is far too high to be usable, notably TiO2(ϵr= 104; Q = 14000 at 3GHz: TCF = +427 ppm K−1). The challenge is to find ways of tuning TCF while maintaining values of ϵrand Q suitable for use in microwave components. This paper explains, in terms of octahedral tilting and ϵrdilution, the tunability of TCF or, more precisely, the temperature coefficient of ϵrin Ca and Sr titanate-based ceramics. Examples of the structural changes that occur during tuning are also shown.",

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AU - Reaney, I. M.

AU - Wise, P.

AU - Ubic, R.

AU - Breeze, J.

AU - Alford, N. Mcn

AU - Iddles, D.

AU - Cannell, D.

AU - Price, T.

PY - 2001/2

Y1 - 2001/2

N2 - Developing a material with a temperature coefficient of the resonant frequency (TCF) of zero is probably the most difficult aspect of research into microwave dielectric ceramics. There are a host of high-quality-factor (Q) high-relative-permittivity (ϵr) materials whose TCF is far too high to be usable, notably TiO2(ϵr= 104; Q = 14000 at 3GHz: TCF = +427 ppm K−1). The challenge is to find ways of tuning TCF while maintaining values of ϵrand Q suitable for use in microwave components. This paper explains, in terms of octahedral tilting and ϵrdilution, the tunability of TCF or, more precisely, the temperature coefficient of ϵrin Ca and Sr titanate-based ceramics. Examples of the structural changes that occur during tuning are also shown.

AB - Developing a material with a temperature coefficient of the resonant frequency (TCF) of zero is probably the most difficult aspect of research into microwave dielectric ceramics. There are a host of high-quality-factor (Q) high-relative-permittivity (ϵr) materials whose TCF is far too high to be usable, notably TiO2(ϵr= 104; Q = 14000 at 3GHz: TCF = +427 ppm K−1). The challenge is to find ways of tuning TCF while maintaining values of ϵrand Q suitable for use in microwave components. This paper explains, in terms of octahedral tilting and ϵrdilution, the tunability of TCF or, more precisely, the temperature coefficient of ϵrin Ca and Sr titanate-based ceramics. Examples of the structural changes that occur during tuning are also shown.

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JF - Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties

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ER -

On the Temperature Coefficient of Resonant Frequency in Microwave Dielectrics

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