Disclosed is an output multiplexer using a TE_(01n) mode and a TE_(11m) mode. The output multiplexer comprises a first cylindrical cavity generating the TE_(01n) mode, a second cylindrical cavity generating the TE_(11m) mode, and a slot iris disposed between the first cylindrical cavity and the second cylindrical cavity, wherein the first cylindrical cavity and the second cylindrical cavity may be vertically arranged. According to the present invention, a length of a channel filter is reduced by using both the TE_(01n) mode and the TE_(11m) mode, so the overall weight of the output multiplexer may be reduced.
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