Title :
Layered Al2O3-TiO2 composite dielectric resonators with tuneable temperature coefficient for microwave applications
Author :
Alford, N.McN. ; Breeze, J. ; Penn, S.J. ; Poole, M.
Author_Institution :
Centre for Phys. Electron., South Bank Polytech., London, UK
fDate :
11/1/2000 12:00:00 AM
Abstract :
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
Keywords :
alumina; composite materials; dielectric losses; dielectric resonators; titanium compounds; 10 GHz; 300 K; Al2O3-TiO2; Al2O3-TiO2 layered composite dielectric resonator; dielectric loss factor; microwave applications; resonant frequency; temperature coefficient; tuning;
Journal_Title :
Science, Measurement and Technology, IEE Proceedings -
DOI :
10.1049/ip-smt:20000699
