W波段双极化单脉冲天线设计
投稿时间:2018-04-01  修订日期:2018-09-05  点此下载全文
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作者单位E-mail
孟洪福 东南大学 毫米波国家重点实验室 menghongfu@163.com 
陈阳 东南大学 毫米波国家重点实验室  
窦文斌 东南大学 毫米波国家重点实验室  
基金项目:国家自然科学基金(61671146,61101020)
中文摘要:为了探测目标的极化特性,研制了工作在W波段的双极化单脉冲卡塞格伦天线。天线由主反射面、副反射面、馈源喇叭、正交模耦合器及和差器组成。天线主反射面口径为137mm,馈源为五喇叭形式,正交模耦合器采用渐变波导匹配方案,和差器通过平面型定向耦合结构实现。通过将馈源喇叭、正交模耦合器及和差器集成设计,减小了连接损耗,压缩了天线纵向尺寸。测试结果表明,天线驻波带宽约3.7GHz,极化隔离度优于35dB,和波束增益大于37.9dB,副瓣电平优于-15dB,差波束零深优于-25dB。在W波段实现了较好的双极化单脉冲性能。
中文关键词:毫米波  单脉冲  双极化  卡塞格伦天线
 
Design of Dual-polarized Monopulse Antenna at W Band
Abstract:In order to detect the polarization properties of the target, a dual-polarized monopulse antenna at W band is proposed. The antenna is composed of the main-reflector, the sub-reflector, the feed horns, the orthomode transducer and the differential network. The aperture diameter of the antenna is 137mm, the feed contains five horns, the orthomode transducer is designed using the tapered waveguide, and the differential network is realized by the planer coupler. The feed horns, orthomode transducer, and differential network are integrated designed to reduce the insertion loss and compress the size of the antenna. The measured results show that the impedance bandwidth of the antenna is about 3.7GHz, the polarization isolation is greater than 35dB, the maximal gain of the sum beam is about 37.9dB, the sidelobe level is below -15dB, and the null depth of the differential beam is greater than -25dB. The antenna shows good dual-polarized monopulse performance at W band.
keywords:millimeter  wave, monopulse, dual-polarized, Cassegrain  antenna
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