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Layered Al2O3-TiO2 composite dielectric resonators

Layered Al2O3-TiO2 composite dielectric resonators

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Aluminium oxide displays a very low tanδ at microwave frequencies. It also possesses a remarkably high thermal conductivity, ideal for heat dissipation in high power satellite filters. However, its temperature coefficient of the resonant frequency (τf) is approximately –60 ppm/K. It is shown that the application of a film of titanium oxide which has a τf of opposite sign (450 ppm/K) produces a composite in which the τf can be tuned to be zero over a wide temperature range. The tanδ of the composite at zero τf is 3.3 × 10-5 (Q = 30000) at room temperature and at 10 GHz.

Inspec keywords: dielectric losses; dielectric resonators; titanium compounds; alumina; composite materials

Other keywords: layered Al2O3-TiO2 composite dielectric resonator; temperature coefficient; 10 GHz; heat dissipation; thermal conductivity; loss angle; microwave frequency; aluminium oxide; titanium oxide film; Al2O3-TiO2; high-power satellite filter; resonant frequency

Subjects: Other dielectric applications and devices; Composite materials (engineering materials science); Waveguide and microwave transmission line components

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