CAJ | 학술논문

毫米波/亚毫米波临边探测仪中的辐射计通常需要工作在多个频段，如多频段共馈源，则其带宽往往不能达到要求。当多个探测频段共用一个主反射镜，采用准光学技术实现探测频率分离，则可以节省很大的空间。准光极化线栅和准光频率选择器相配合用来分离频率范围在118 GHz~340 GHz 的4个频带，准光极化线栅是一个准光功率分配/合成器，将4个频段的信号分为(183 GHz/240 GHz)和(118 GHz/340 GHz)2组信号。准光频率选择器是一个高频频率选择表面，可以将高频段的电磁波透射，低频段的电磁波反射。反射和透射的电磁波分别进入2个频段的接收模块，实现信号的接收。本文利用HFSS仿真软件对周期单元的结构参数进行仿真优化，并通过仿真结果完成了准光极化线栅和准光频率选择器的技术实现。实测结果与毫米波/亚毫米波临边探测仪的设计要求一致。
호미파/아호미파림변탐측의중적복사계통상수요공작재다개빈단，여다빈단공궤원，칙기대관왕왕불능체도요구。당다개탐측빈단공용일개주반사경，채용준광학기술실현탐측빈솔분리，칙가이절성흔대적공간。준광겁화선책화준광빈솔선택기상배합용래분리빈솔범위재118 GHz~340 GHz 적4개빈대，준광겁화선책시일개준광공솔분배/합성기，장4개빈단적신호분위(183 GHz/240 GHz)화(118 GHz/340 GHz)2조신호。준광빈솔선택기시일개고빈빈솔선택표면，가이장고빈단적전자파투사，저빈단적전자파반사。반사화투사적전자파분별진입2개빈단적접수모괴，실현신호적접수。본문이용HFSS방진연건대주기단원적결구삼수진행방진우화，병통과방진결과완성료준광겁화선책화준광빈솔선택기적기술실현。실측결과여호미파/아호미파림변탐측의적설계요구일치。
Millimeter/sub-millimeter limb sounder plays an important role in atmospheric science, environmental science and global climate change research. Millimeter/sub-millimeter limb sounding radiometer usually needs to operate in multiple frequency bands, such as multi-band of feed,therefore its bandwidth can not meet the requirements usually. When multiple detection bands share a primary mirror, using quasi-optical technology to achieve the detection of frequency separation can save a lot of space. The combination of quasi-optical polarization wire grid and quasi-optical frequency selector can be used to separate four bands of frequency ranging from 118 GHz to 340 GHz. Quasi-optical polarization wire grid is a quasi-optical power divider/combiner,which separates the four bands signals into 183 GHz/240 GHz and 118 GHz/340 GHz; while quasi-optical frequency selector is a high frequency selective surface, which can transmit high-frequency electromagnetic waves and reflect low frequency electromagnetic waves. Reflected and transmitted electromagnetic waves enter into two receiving modules to achieve signal reception. In this paper, the structural parameters are simulated and optimized in HFSS for the periodic unit. The quasi-optical polarization wire grid and quasi-optical frequency selector technology are implemented according to simulation results. The practically measured results are consistent to the design requirements of millimeter/sub-millimeter limb sounding instrument.