A monopulse reflector antenna with an illuminator of six elements circular array is studied. The antenna has features of broadband and dual circular polarization performance. The output signals of the antenna are similar to multimode circular waveguide feed with one sum pattern and one difference pattern. The method for conveting the two channel signals to one channel signal is provided. The six log-periodic monopole antennas (LPMA) illuminator, diplexer, beam form network (BFN), single channel modulator (SCM) of a L/S dual band tracking antenna are introduced. The gain of sum pattern of 22.9dB, 30.1dB, zero-depth of difference pattern of 35dB, 40dB at 1.1GHz, 2.2GHz respectively are achieved with a 3.2m reflector. The antenna can auto-tracking beacon stably in the L/S bands.
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