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Metamaterial was one of the major tool in the design of polarization conversion. Cross polarization converter was one of the important part of electromagnetic wave manipulation device.The metamaterial for the cross polarization converter was formed by using multi-layer split ring resonator. Also cross polarization converter was more beneficial in the area of communication, imaging, anti interference, etc. This paper was about the design of a four layer 2-4 slot cross polarization converter and its array. Compare the Bandwidth, polarization convertion ratio(PCR), Radar cross section(RCS).