On the temperature coefficient of resonant frequency in microwave dielectrics
| Autor: | N McN Alford, D.S. Cannell, Ian M. Reaney, Jonathan Breeze, P. L. Wise, T. Price, Rick Ubic, D. Iddles |
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| Rok vydání: | 2001 |
| Předmět: |
Permittivity
Physics and Astronomy (miscellaneous) Condensed matter physics Chemistry Metals and Alloys Dielectric Condensed Matter Physics Titanate Dielectric ceramics Electronic Optical and Magnetic Materials Nuclear magnetic resonance visual_art visual_art.visual_art_medium General Materials Science Ceramic Temperature coefficient Microwave |
| Zdroj: | Philosophical Magazine A. 81:501-510 |
| ISSN: | 1460-6992 0141-8610 |
| DOI: | 10.1080/01418610108214318 |
| Popis: | 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 (er) materials whose TCF is far too high to be usable, notably TiO2 (er = 104; Q = 14000 at 3GHz: TCF = +427 ppm K−1). The challenge is to find ways of tuning TCF while maintaining values of er and Q suitable for use in microwave components. This paper explains, in terms of octahedral tilting and er dilution, the tunability of TCF or, more precisely, the temperature coefficient of er in Ca and Sr titanate-based ceramics. Examples of the structural changes that occur during tuning are also shown. |
| Databáze: | OpenAIRE |
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