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Study the effect of wet antenna at ka band / Woon Wai Leong

Study the effect of wet antenna at ka band_Woon Wai Leong_E3_2009_875004543_00003095366_NI_
Semasa eksperimen perambatan Ka-band dengan NASA Advanced Communications and Technology Satellite (ACTS), didapati air di atas permukaan antenna semasa hujan telah menyebabkan pelemahan tertentu dan ini adalah wajib untuk meramalkan kerugian ini dengan tepat sekali. Dua eksperimen dijalankan dalam projek akhir tahon ini. Pertama, air disiram ke atas feed dan kedua satu “rain simulator” dibina untuk menjadikan hujan yang dibuat adalah lebih realistis. Dalam kedua-dua kes, aliran air adalah dipandu oleh graviti dan dianggap laminar. Output untuk projek ini adalah pelemahan yang disebabkan oleh air di atas “reflector” dan “feed”. Input adalah kadar hujan, suhu dan cuaca. Data diambil untuk tiga hari bagi menentukan kejituan keputusan yang diperolehi. Secara kesimpulan, aliran air di atas “reflector” dan “feed” akan menyebabkan attenuation tertentu . Ini boleh dibuktikan dengan manganalisiskan data yang diperolehi melalui eksperimen. _________________________________________________________________________________________ During the Ka-band propagation experiment with the NASA Advanced Communications and Technology Satellite (ACTS) it was discovered that water on the antenna surfaces during rain causes significant attenuation and it became necessary to predict these losses as accurately as possible. Two experiments are conducted in this final year project. First, the feed is spraying with water and second the rain simulator is build to cause the flow of water on the dish. In both cases, the water flow is driven by gravity and considered to be laminar. The ultimate output parameter for the model is the expected attenuation due to water on the reflector and feed window. The input parameters are the rain rate, temperature and the weather of the day. Data are collected in three different days to ensure that the data validation and different weather may cause different result. As a conclusion, water flow on the dish and the feed may cause significant influences on the attenuation. This can be proved by analyzing the data obtained from the experiment.
Contributor(s):
Woon Wai Leong - Author
Primary Item Type:
Final Year Project
Identifiers:
Accession Number : 875004543
Language:
English
Subject Keywords:
Ka-band; antenna; gravity
First presented to the public:
4/1/2009
Original Publication Date:
10/2/2018
Previously Published By:
Universiti Sains Malaysia
Place Of Publication:
School of Electrical & Electronic Engineering
Citation:
Extents:
Number of Pages - 92
License Grantor / Date Granted:
  / ( View License )
Date Deposited
2018-10-02 15:24:45.025
Date Last Updated
2019-01-07 11:24:32.9118
Submitter:
Nor Hayati Ismail

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