基于肖特基二极管的140 GHz次谐波混频器

140 GHz sub-harmonic mixer based on Schottky diode

摘要:

肖特基二极管混频器是毫米波太赫兹频段的超外差接收机中的关键器件，其研制对于太赫兹通信和雷达应用具有重要意义。本文描述了一种基于低寄生参量肖特基二极管DBES105a的140 GHz二次谐波混频器(SHM)的仿真设计和制作测试。为了计算二极管特性阻抗，通过对二极管半导体物理结构的研究，建立了肖特基二极管三维电磁仿真模型。次谐波混频器采用波导腔体悬置微带线结构，通过HFSS +ADS联合仿真设计。仿真结果显示，在65 GHz,7 dBm本振信号激励下，140 GHz频点处的SSB转换损耗为6.3 dB，1 dB转换损耗带宽为14 GHz，DSB噪声温度小于400 K。测试结果显示，最低SSB转换损耗为26 dB/135 GHz，3 dB转换损耗带宽为8 GHz。

Abstract:

Schottky diode mixer is the critical component of millimeter wave & Terahertz super heterodyne receiver used in communication and radar system. This letter presents the design and fabrication of a 140 GHz Sub-Harmonic Mixer(SHM) based on low parasitic component Schottky diode DBES105a. Under the research on physical structure of diode semiconductor, the three-dimensional EM diode model is established. The SHM employing suspended microstrip structure is designed with High Frequency Structure Simulator (HFSS)+Advanced Design System (ADS) co-simulation method. Simulation result indicates that the SSB conversion loss of the mixer is 6.3 dB in 140 GHz with 7 dBm, 65 GHz LO pumping; 1 dB conversion loss bandwidth is 14 GHz; and DSB noise within bandwidth is below 400 K. Measurement result indicates that the mixer has the lowest conversion loss of 26 dB in 135 GHz, with 8 GHz 3 dB conversion loss bandwidth.