A Research Of THz Frequency Conversion Technology Based On The Planar Schottky Diode

Due to the special position in the electromagnetic spectrum,the terahertz band has many superior characteristics and has very important academic and application value in related research fields.At present,it has shown great application value in communication,medical,detection and other fields.In terahertz systems,frequency conversion technology is an important part of terahertz research.Its main function is to achieve terahertz frequency shift and multiplication,which is closely related to the performance of the transceiver system.This thesis will focus on terahertz multipliers and mixers,and carry out the design of related circuits.In this thesis,a unit circuit-based design method is used.First of all,a 220 GHz balanced tripler is designed.The circuit structure is split into several component circuits with specific functions,which are optimized for design,and a 3D EM model of the diode is established to simulate the parasitic parameters of diode.The overall circuit uses ADS and HFSS to complete the harmonic balance simulation.The actual measurement shows that when the input power is fixed at 100 mW,the maximum output power is 1.1mW.Secondly,the 220 GHz unbalanced triple frequency multiplier was designed by adjusting the transmission line and adding a bias structure.The circuit design was also completed by the combination of 3D EM and circuit.The actual measurement shows that when the multiplier is self-biased with an external resistor and fixed drive power at 100 mW,the maximum output power is 3.1mW,and the minimum conversion loss is 15 dB.Finally,by the process of the IMECAS,two versions of InP-based monolithic mixers covering the extremely wide band of 2-110 GHz were designed.Using the improved double-balanced mixing structure,the fundamental wave mixing / harmonic mixing work simultaneously is achieved.The simulation results show that the conversion loss of the fundamental mixing in the 2~40GHz mixer is less than 17dB;the conversion loss of the third harmonic mixing in the 40~110GHz is less than 30 dB.There are few domestic reports on the realization of such ultra-wideband mixers,which is a more meaningful design attempt.