Research On Terahertz Dynamic Device Based On Finline Loaded Diode And Communication System

Terahertz communication as a key technology to realize high-speed space transmission in the future,has the advantages of high frequency,narrow beam and strong anti-interference.Terahertz communications technology will have a wide range of military and civilian applications.How to realize the high-speed terahertz communication system has become a hot research issue in China or at abroad.As the core device of the terahertz direct modulation communication system,the terahertz modulator is facing problems such as complex structure and low speed at this stage.In this dissertation,the terahertz modulator is designed by combining the fin line and the metamaterial loaded Schottky diode,and the related experiments of the terahertz communication system are carried out on the designed modulator.This article focuses on the terahertz wireless communication system based on direct modulation,and carries out the research work of terahertz modulator.Firstly,the terahertz quasi-optical modulator based on vanadium dioxide material is studied.The quasi-optical modulator adopts a combination of artificial microstructure and vanadium dioxide to realize the dynamic adjustment of the surface magnetic field,and has an on-off ratio of19.48 d B.Then the volt-ampere characteristics of Schottky diodes in the terahertz band are studied.The equivalent circuit parameters of the diodes are extracted through simulation.According to the diode parameters,a 220 GHz modulator based on fin lines combined with artificial microstructures is designed.The insertion loss of the modulator is 6d B,the switching ratio is 15 d B,and the bandwidth is 30 GHz.At the same time,a340 GHz modulator based on fin-line combined with artificial microstructure was designed and tested with vector network.The insertion loss of the modulator is 6d B and the switching ratio is 21 d B,which meets the basic requirements of terahertz communication system for device performance.Carried out experimental research work of terahertz high-speed wireless communication.A transmission attenuation model is established to estimate the attenuation characteristics of the terahertz wave channel.According to different modulation methods,two types of terahertz wireless communication system experimental research work have been carried out.According to different modulation methods,two types of terahertz wireless communication system experimental research work have been carried out.Based on the developed terahertz modulator,a terahertz wireless communication system based on direct modulation is built.The system works at 340 GHz,adopts direct detection and reception technology,and realizes 6Gbps video transmission at a distance of 20 meters;adopts frequency mixing the receiving technology realizes1.5Gbps eye pattern transmission under 250 meters.The second category is a terahertz wireless communication system based on frequency mixing modulation.The system works at 220 GHz.At a communication distance of 20 meters,it uses frequency mixing modulation to achieve 10 Gbps video transmission;using orthogonal mixing modulation to achieve 20 Gbps Video transmission.Through the above two parts of the study,this paper from the simulation design and processing test to the system construction for a detailed study and analysis,verified the feasibility of terahertz communication system,for the future long-term development of terahertz wireless communication technology to provide a good technical support.