Abstract: Ultra-WideBand (UWB) feeds have high utility values in radio astronomy and communications, in this paper, we design and implement a quadruple-ridge ultra-wideband feed operating at 2 ~ 14 GHz. The feed covers 7 octave bandwidth also has large edge illumination angle. Measurements of the manufactured feed show that the edge illumination angle is larger than 60°, which can be more suitable for the primary-focus reflector systems. The feed has a return loss of better than -10 dB, even better than -15 dB in most frequencies. Radiation pattern of the feed has stable beam width and better circular symmetry, gain is also more than 10 dB.