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本文介绍了一种基于平面肖特基势垒二极管的440GHz次谐波混频器,采用三维建模提取寄生参数的仿真方法,电路为石英基片悬置微带形式,反向并联二极管对倒置黏贴在基片上。电路中的无源结构以及二极管的线性寄生参数部分利用三维建模并进行有限元法分析,最后与二极管的非线性部分联合进行谐波平衡仿真,通过仿真优化获得二极管的最佳嵌入电路。最终,仿真结果显示在3.3m W的本振驱动功率下,射频频率420~460GHz范围内单边带变频损耗低于10d B,在437GHz附近取得最佳值7.3 d B。
In this paper, a 440GHz subharmonic mixer based on a planar Schottky barrier diode is introduced. The three-dimensional modeling is used to extract the parasitic parameters. The circuit is a suspension of microstrip in quartz substrate, Paste on the substrate. The passive structure in the circuit and the linear parasitics part of the diode are modeled by 3D and analyzed by finite element method. Finally, harmonic balance simulation is carried out in combination with the nonlinear part of the diode, and the optimal embedded circuit of the diode is obtained through simulation optimization. Finally, the simulation results show that the single sideband frequency loss is less than 10d B at the frequency of 420-460GHz and the best 7.3d at 437GHz at the LO power of 3.3mW.