In this study, when developing a phased array feeder for the verification of dual reflector antennas for satellite synthetic aperture radar (SAR) applications, the main component test and performance verification of the feeder were considered. The performance was verified at the level of the component radiator, radiofrequency/control board, and integrated phased array feeder with specifications, including the bandwidth, polarization, directivity, beam width, and side lobe, required for the feeder. Accordingly, it was confirmed that the bandwidth was 19.18 % (H) and 16.07 % (V), directivity was 38.42 dBi (H), 38.32 dBi (V), HPBW Az/El 2.064° (H)/2.187° (H), 2.083° (V)/2.202° (V), and the side lobe was under −12.84 dB (H), −13.05 dB (V). Therefore, we verified that it can be adopted as a phased array feeder for the verification of dual reflector antennas for satellite SAR applications.