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Layered Al2O3-TiO2 composite dielectric resonators with tuneable temperature coefficient for microwave applications

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4 Author(s)
Alford, N.McN. ; Centre for Phys. Electron., South Bank Polytech., London, UK ; Breeze, J. ; Penn, S.J. ; Poole, M.

Aluminium oxide displays very low dielectric loss factor (tan δ) at microwave frequencies. However, its temperature coefficient of resonant frequency (τf) is approximately -60 ppm/K and is unsatisfactory for certain applications. It is shown that applying a film of titanium oxide with a τf of 450 ppm/K produces a composite in which the τf can be tuned to zero over a wide temperature range. The tan δ of the composite at zero τ f is 3.3×10-5 (Q=30000) at room temperature (300 K) and at 10 GHz

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Science, Measurement and Technology, IEE Proceedings -  (Volume:147 ,  Issue: 6 )