采用单元电路法的4THz单片集成混频器设计  

Design of 4 THz monolithic integrated mixer using unit circuit method

作　　者：唐家轩 李少甫[1] 何婷婷 余蒋平 唐颖颖 TANG Jiaxuan;LI Shaofu;HE Tingting;YU Jiangping;TANG Yingying(School of Information Engineering,Southwest University of Science and Technology,Mianyang 621010,China)

机构地区：[1]西南科技大学信息工程学院,四川绵阳621010

出　　处：《传感器与微系统》2021年第10期79-82,86,共5页Transducer and Microsystem Technologies

基　　金：国家自然科学基金委员会—中国工程物理研究院NSAFL联合基金资助项目(U1830201)。

摘　　要：为构建基于自由电子激光器的高分辨率太赫兹谱仪,设计了一种4THz八次谐波混频器。混频器采用混合传输线结构,减轻了无源电路的设计和加工难度,同时保证了混频器三个端口间的隔离度。在HFSS中设计优化了波导—悬置微带线过渡电路模型、滤波器模型和肖特基二极管模型。将混频器整体电路拆分成3个单元电路,在HFSS中仿真优化各个单元电路的性能,再拼接成完整的混频器进行联合仿真优化。仿真结果表明:在5 dBm的本振功率驱动下,在3.4~4.4 THz频率范围内,混频器的单边带变频损耗优于64.3 dB,射频回波损耗优于11 dB,在3.4~4.0 THz范围内,混频器变频损耗优于60 dB,带内平坦度较好,整体电路性能较为稳定。In order to construct a high-resolution terahertz spectrometer based on free electron lasers,a 4 THz eighth harmonic mixer was designed.The mixer adopts a hybrid transmission line structure,which reduces the difficulty of passive circuit design and processing,and at the same time ensures the isolation between the three ports of the mixer.The waveguide-suspension microstrip transition circuit model,filter model and Schottky diode model are designed and optimized in HFSS.Split the overall mixer circuit into three unit circuits,simulate and optimize the performance of each unit circuit in HFSS,and then splice it into a complete mixer for joint simulation optimization.Finally,the simulation results show that,driven by the local oscillator power of 5 dBm,in the frequency range of 3.4~4.4 THz,the single-sideband conversion loss of the mixer is better than 64.3 dB,and the RF return loss is better than 11 dB,in range of 3.4~4.0 THz,the mixer conversion loss is prior to 60 dB,the in-band flatness is better,and the overall circuit performance is relatively stable.

关 键 词：太赫兹 砷化镓 肖特基二极管 变频损耗 回波损耗 传输损耗 

分 类 号：TN773[电子电信—电路与系统]