Abstract: ?A microwave network which can realize the diversity of dual frequency andpolarization is introduced in this paper. It can be used in the radar' system to reduce the rain andsea wave interference. lt can also provide more information of objects for the microwave imaging.The feature of this network is that the cheap and mature nonreciprocal ferrite phase shiftersare used as the basic variable polarization devices.Flow charts are used to analyze the operating principle, and the X-band experimental resultsare given.