太赫兹-16 dB本振信号耦合器设计与实现  

Design and implementation of THz-16 dB coupler for local oscillator signal

作　　者：谭贞 丁江乔 张沁旖 刘冬[3] TAN Zhen;DING Jiangqiao;ZHANG Qinyi;LIU Dong(School of Electronic&Information Engineering,Nanjing Jiangsu 210044,China;Changwang School of Honors,Nanjing University of Information Science&Technology,Nanjing Jiangsu 210044,China;Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing Jiangsu 210034,China)

机构地区：[1]南京信息工程大学电子与信息工程学院,江苏南京210044 [2]南京信息工程大学长望学院,江苏南京210044 [3]中国科学院紫金山天文台,江苏南京210034

出　　处：《太赫兹科学与电子信息学报》2021年第6期978-983,共6页Journal of Terahertz Science and Electronic Information Technology

基　　金：国家自然科学基金资助项目(12003011)。

摘　　要：针对太赫兹频段边带分离接收机的应用需求,综合考虑本振信号弱耦合度、射频信号高方向性及现阶段铣削工艺精确度等要求,研制了一款400~500GHz频段-16dB本振信号波导耦合器。主要包括分支型定向耦合器的耦合度特性分析、-16 dB弱耦合度波导耦合器设计、基于数控机械加工(CNC)技术的器件制备与结果讨论。2件样品实测结果均表明:该耦合器在400~500 GHz频段(相对带宽为22.5%)获得本振信号耦合度在-16~-17 dB,射频信号方向性为-1.2 dB,隔离度优于-20 dB,所有端口回波损耗优于-15 dB。上述性能均与仿真结果保持高度一致,表明当前CNC技术能够满足该高频段波导耦合器制备的高精确度需求。A-16 dB waveguide coupler for the Local Oscillator(LO)signal in 400-500 GHz band is developed in order to meet the application requirements of terahertz sideband-separating receivers,mainly considering the weak coupling of LO signal,the high directivity of Radio Frequency(RF)signal and current milling process accuracy.The characteristic of the coupling degree of the branch coupler is analyzed.The design of a-16 dB waveguide coupler is conducted.The device is processed based on Computer Numerical Control(CNC)technology and the result is discussed.The measured results of both samples show that this coupler can work in 400-500 GHz band(factional bandwidth of 22.5%),obtaining the coupling coefficient for the LO signal in-16~-17 dB,the directivity for RF signal of-1.2 dB,the isolation degree better than-20 dB,and the return loss of each port better than-15 dB.The performance is highly consistent with that of the simulations,which indicates that current CNC technology can meet the high precision requirements for the fabrication of such high frequency waveguide coupler.

关 键 词：太赫兹 波导耦合器 耦合度 本振信号 射电天文 

分 类 号：TN710[电子电信—电路与系统]