Evaluation of nanoalumina coated germanium black polyimide membrane as sunshield for application on the communication satellite antenna

Esther, ACM and Sridhara, N and Sebastian, SV and Bera, Parthasarathi and Anandan, C and Rangappa, D and Sharma, AK and Dey, Arjun (2016) Evaluation of nanoalumina coated germanium black polyimide membrane as sunshield for application on the communication satellite antenna. Ceramics International, 42 ( Issue). 2589-2598. ISSN 0272-8842

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    Abstract

    Alumina thin coatings were grown on Germanium (Ge) coated black polyimide (GBP) or Kapton which has been used as a sunshield membrane on communications satellite antennas to protect it from environmental degradation during ground storage and implementation. The deposited alumina coatings were found to be optically transparent in solar regime in spectral window while RF characteristic revealed negligible losses. Space worthiness of the coating was examined by simulated space environments, e.g. humidity, thermal cycling and thermovacuum tests. No degradation was observed in its microstructural, thermo-optical, electrical,chemical state and RF characteristic in particular Ku and Ka bands. The aforesaid study indicates that the alumina thin coating is able to prevent surface degradation of GBP retaining the thermo-optical properties of the Ge coated Kapton and RF transparency which are functional requirements for communication antenna. The thickness of the optimized alumina coating was ~60 nm.

    Item Type: Journal Article
    Additional Information: Copyright to this article belongs to M/s. ELSEVIER
    Uncontrolled Keywords: Alumina;Ge coated black Kapton;Humidity;Thermal cycling; Thermovacuum;XPS
    Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
    Division/Department: Other, Other, Other, Surface Engineering Division, Surface Engineering Division, Other, Other, Other
    Depositing User: Ms. Alphones Mary
    Date Deposited: 05 May 2016 09:51
    Last Modified: 05 May 2016 09:51
    URI: http://nal-ir.nal.res.in/id/eprint/12468

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