应用于微小卫星平台的太赫兹分频技术研究
投稿时间:2018-05-18  修订日期:2018-11-20  点此下载全文
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作者单位E-mail
王婧 中国科学院国家空间科学中心 wangjingcoral@126.com 
张升伟 中国科学院国家空间科学中心  
孟进 中国科学院国家空间科学中心  
基金项目:青年人才托举工程(2015QNRC001);“十三五”装备预研领域基金(6140136010116ZK24001)
中文摘要:基于微小卫星组网编队技术,气象预报工作在时间和空间分辨率方面得到大幅提升.为了完成微小卫星大气微波探测仪射频部分的频率分离功能,本文采用体积小、插损小的波导双工器来实现.采用等效电路法和模式匹配法优化参数,设计了一款166/183GHz双工器.考虑到实际加工情况,仿真过程中具体分析了膜片陡直度和膜片厚度对双工器性能的影响.加工过程中,通过对器件分割方式和加工缺陷的分析,不断优化加工方案,最终得到满意的加工样品.经测试,166/183GHz双工器的带内插损小于1.5dB,回波损耗大于15dB,带外抑制高于27dB以上,仿真结果与实测结果相吻合,证明了双工器设计方法的可行性。
中文关键词:微小卫星  太赫兹分频技术  波导双工器  模式匹配法  实验分析
 
Research on terahertz frequency division technique applied to microsatellite platform
Abstract:Based on microsatellite constellation, meteorological forecast has been greatly improved in terms of temporal and spatial resolution. To separate frequency in RF front-end system of the microsatellite atmospheric microwave sounder, a waveguide diplexer with compact size and low insertion loss is adopted. A 166/183GHz diplexer is designed using equivalent circuit method and mode-matching technology. According to the actual situation of machining, the effects of iris steepness and iris thickness on the performance of diplexer are analyzed in simulation. Through the analysis of the split-block realization and the machining defects, the way of machining is continuously optimized to obtain a satisfactory machining sample. Maximum measured insertion loss is 1.5dB, and minimum measured return loss is 15dB. Measured out-band rejection is higher than 27dB. Good agreement between simulation and measurement has validated the feasibility of designing method.
keywords:microsatellites, terahertz frequency division technique, waveguide diplexer, mode-matching technology, experimental analysis
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