Robust Sub-harmonic Mixer at 340 GHz Using Intrinsic Resonances of Hammer-Head Filter and Improved Diode Model

  • Cheng Wang
  • Yue HeEmail author
  • Bin Lu
  • Jun Jiang
  • Li Miao
  • Xian-Jin Deng
  • Yong-zhong Xiong
  • Jian Zhang


This paper presents a sub-harmonic mixer at 340 GHz based on anti-parallel Schottky diodes (SBDs). Intrinsic resonances in low-pass hammer-head filter have been adopted to enhance the isolation for different harmonic components, while greatly minimizing the transmission loss. The application of new DC grounding structure, impedance matching structure, and suspended micro-strip mitigates the negative influences of fabrication errors from metal cavity, quartz substrate, and micro-assembly. An improved lumped element equivalent circuit model of SBDs guarantees the accuracy of simulation, which takes current-voltage (I/V) behavior, capacitance-voltage (C/V) behavior, carrier velocity saturation, DC series resistor, plasma resonance, skin effect, and four kinds of noise generation mechanisms into consideration thoroughly. The measurement indicates that with local oscillating signal of 2 mW, the lowest double sideband conversion loss is 5.5 dB at 339 GHz; the corresponding DSB noise temperature is 757 K. The 3 dB bandwidth of conversion loss is 50 GHz from 317 to 367 GHz.


Terahertz Sub-harmonic mixer Hammer-head filter Schottky diode Device modeling 



The authors would like to thank Cheng-Li Xie, Wei Huang, Hai-Long Hao, Cheng-Wei Li, and Da-Long Zhou in IEE CAEP for their support on module fabrication and testing.


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© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  1. 1.Microsystem &Terahertz Research Center, Institute of Electronic EngineeringChina Academy of Engineering PhysicsMianyangChina

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