The invention relates to a cross polarization multiplexer which doubles the capacity of radio links using a vertical polarization diplexer, a horizontal polarization diplexer and an octagonal transducer module for separating the vertically polarized waves from the horizontally polarized waves. The invention is characterized in that the vertical diplexer and the horizontal diplexer are integrated in a module forming a monoblock body having a specific, simple and inexpensive configuration. This configuration allows the use a single transceiver unit which also provides a cost saving.