提出了一种可应用于Ka频段毫米波卫星通信系统的新型圆极化天线实现方案。利用回折线周期结构特性,只需在已有线极化喇叭天线的前方放置回折线型圆极化器,不需对已有线极化天线做任何内部修改,即可实现线极化向圆极化的转换。这种实现方式具有低成本、低设计复杂度、高灵活性的特点,可与现有的线极化毫米波天线无缝兼容。采用CST软件建立系统仿真模型,对回折线结构进行了参数分析,并对天线进行了加工与实际测试。实验结果表明:该天线的3dB以下轴比圆极化工作带宽覆盖27.5-32.5GHz。 A new type of circularly polarized antenna that can be applied to Ka-band millimeter-wave satellite communication system is proposed. Use the return line cycle structure features, just in front of the existing linear polarized horn antenna placed back to the polyline circular polarizer, without having to do any internal modifications to the existing linear polarization antenna, you can achieve linear polarization to circular polarization Conversion. This implementation has the characteristics of low cost, low design complexity and high flexibility, which can be seamlessly compatible with existing linearly polarized millimeter-wave antennas. CST software was used to establish the system simulation model, the parameters of the return line structure were analyzed, and the antenna was processed and tested. Experimental results show that: the antenna below the 3dB circular polarization than the working bandwidth of 27.5-32.5GHz coverage.