Ultra-porous alumina for applications in microwave planar antennas

Авторы: Stepanenko O., Tartari A., Amamra M., Nguyen T.H.N, Piat M., Favero I., Ducci S., Khodan A., Boinovich L.B., Emelyanenko A.M., Kanaev A., Leo G.
Журнал: Advanced Device Materials
Том: 1
Номер: 4
Год издания: 2016
Первая страница: 93
Последняя страница: 99
DOI: 10.1080/20550308.2015.1120442
Аннотация: We report on the experimental study of ultra-porous alumina (UPA) of transition phases γ and θ, which we fabricate by oxidation of laminated metallic aluminum followed by chemical and thermal treatments. Its morphology of a nanostructured monolith with up to 99% porosity brings together several crucial advantages with respect to existing aluminum oxides: an ultra-low density, the potential of refractive index gradients, and a chemically tunable hydrophilic character. Its extremely low permittivity measured here for the first time, εr ≈ 1.2 at 130–165 GHz, makes UPA a promising substrate material for planar electromagnetic components in this microwave spectral range of great interest for the cosmic microwave background observation. The dielectric loss tan δ ≈ 10−3, although being relatively low, can be further reduced after a chemical treatment that conveys hydrophobic character to the UPA constituting nanofibers.
Добавил в систему: Ходан Анатолий Николаевич

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