A wide bandwidth, dual polarized, modified four-square antenna is presentedas a feed antenna for radio astronomical measurements. A linear array of theseantennas is used as a line-feed for cylindrical reflectors for Tianlai, a radiointerferometer designed for 21~cm intensity mapping. Simulations of the feedantenna beam patterns and scattering parameters are compared to experimentalresults at multiple frequencies across the 650 - 1420 MHz range. Simulations ofthe beam patterns of the combined feed array/reflector are presented as well.
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