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,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166/183 GH...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,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166/183 GHz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,166/183 GHz双工器的带内插损小于1. 5 d B,回波损耗大于15 d B,带外抑制高于27 d B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.展开更多
In this review, we describe the principles of the tunnel junction, self-assembled monolayer （SAM） application techniques, experimental testbed fabrication, and characterization of the films and devices. In addition,...In this review, we describe the principles of the tunnel junction, self-assembled monolayer （SAM） application techniques, experimental testbed fabrication, and characterization of the films and devices. In addition, techniques for directed application, removal, and functionalization of the monolayers are discussed. Bottom-up fabrication techniques have seen increased attention because of their versatility and ease of use. These films see mechanical uses as surface modifiers and micro-scale lubricants. Advances in nanowatt electronics and ultra-low power sensors have opened up an energy harvesting niche for solutions which would have proven ineffective just some years ago. The focus of this study is the two- terminal junction which has potential applications in THz rectification for energy harvesting, medical imaging, and defense sensing. The quantum theory of operation behind these devices is touched on briefly---describing tunneling through the organic monolayers. Commentary on trends in research and potential future work are presented as well.展开更多
文摘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,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166/183 GHz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,166/183 GHz双工器的带内插损小于1. 5 d B,回波损耗大于15 d B,带外抑制高于27 d B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.
文摘In this review, we describe the principles of the tunnel junction, self-assembled monolayer （SAM） application techniques, experimental testbed fabrication, and characterization of the films and devices. In addition, techniques for directed application, removal, and functionalization of the monolayers are discussed. Bottom-up fabrication techniques have seen increased attention because of their versatility and ease of use. These films see mechanical uses as surface modifiers and micro-scale lubricants. Advances in nanowatt electronics and ultra-low power sensors have opened up an energy harvesting niche for solutions which would have proven ineffective just some years ago. The focus of this study is the two- terminal junction which has potential applications in THz rectification for energy harvesting, medical imaging, and defense sensing. The quantum theory of operation behind these devices is touched on briefly---describing tunneling through the organic monolayers. Commentary on trends in research and potential future work are presented as well.
