Optimization of 200-800MHz Eleven Feed for GMRT

This paper discusses in brief the electrical design of the Eleven feed for the parabolic reflector antennas of Giant Meterwave Radio Telescope (GMRT-India) optimized for 200 to 800 MHz bandwidth. Paper also gives the comparison between the simulated and measured antenna input reflection coefficient and radiation patterns. The measured S11 of the feed is less than -8 dB and the computed total aperture efficiency including the mismatch losses, is better than -3.2 dB over desired bandwidth for the reflector antennas of GMRT having 62.5deg of half subtended angle.