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PIER PIER B PIER C PIER M PIER Letters
2008-01-14
A Novel Method for Testing Ultra Wideband Antenna-Feeds on Radio Telescope Dish Antennas
By
Shubhendu Joardar,

    Dr. Shubhendu Joardar

    Tata Institute of Fundamental Research

    India

    Homepage

Ashit Bhattacharya

    Dr. Ashit Bhattacharya

    Department of Physics

    University of Kalyani

    India

    Homepage

Progress In Electromagnetics Research, Vol. 81, 41-59, 2008
doi:10.2528/PIER07120402
Abstract
A prototype of dual polarized ultra wideband antenna-feed was fabricated (200 MHz-2000 MHz) for usage in low frequency radio astronomy at the GMRT (Giant Meterwave Radio Telescope). The feed was mounted on one of the GMRT dish antennas and tested using signals from the radio galaxy Cygnus A and zenith sky. Modeling of the GMRT dish with the antenna-feed mounted at its focus has been done. With the use of simulated radiation patterns of the antennafeed and the measured results, the system independent deflections at various frequencies were computed. The performances of the GMRT dish with present mesh and RMS (root mean square) efficiencies have been studied. Performance of the GMRT dish with 100% mesh and RMS efficiencies were computed. Future guidelines of ultra wideband antenna-feed design for GMRT have been indicated. Improvements of the GMRT dishes have also been suggested.
Citation
Shubhendu Joardar, and Ashit Bhattacharya, "A Novel Method for Testing Ultra Wideband Antenna-Feeds on Radio Telescope Dish Antennas," Progress In Electromagnetics Research, Vol. 81, 41-59, 2008.
doi:10.2528/PIER07120402
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