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An axially displaced monopulse dual-reflector antenna operating at W band is proposed in this study. The antenna configuration consists of a hyperboloid as the subreflector, a combination of series of paraboloids with different focal length as the main reflector and a low-loss sum-and-difference network, which is based on waveguide magic Ts and bent waveguides. Compared with traditional dual-reflector antenna, axial size and weight of this novel antenna can be reduced to a certain extent. Measured results show that the gain is 40.1 dBi, the sidelobe is <-19.7 dB and the null-depth is <-27.7 dB at the central frequency. The radiation patterns remain almost the same in the bandwidth. It is demonstrated that this antenna exhibits good radiation performances and is suitable for inter-satellite systems. [ABSTRACT FROM AUTHOR]