Research On 340GHz Low Noise Receiver Frontend

Terahertz(THz)wave indicates electromagnetic wave ranging from 0.1THz to 10 THz.It's a key section of the electromagnetic spectrum,locates in the gap between inferred and microwave,and covers part of millimeter and sub-millimeter wave range.Its basic theory,researching methods and technologies are compatible with microwave and optics.It is a rapidly developed research field since this century.With the development of wireless communication technology,frequency resources have become increasingly crowded,and it is a widely acknowledged view that new frequency spectrum could improve the situation.Terahertz frequency range contains huge unused spectrum resources,which means research on solid state terahertz communication system is very valuable.This thesis focus on solid state terahertz communication system and has a deep research on key parts that construct solid state terahertz receiver.A full solid state 340 GHz terahertz receiver based on schottky diodes is designed,and its key parts are a 170 GHz tripler and a 340 GHz sub-harmonic mixer.The 170 GHz tripler is designed base on schottky varactors with 3D electromagnetic simulation and harmonic simulation optimization and tested in the lab.The simulation results show that when driven power set to 100 mW,bias voltage set to-1.3V,the tripler generates an output power greater than 5mW ranging from 165 GHz to 175 GHz.Measured results show when driven power set to 100 mW,bias voltage set to-1.5V,at 165GHz-175 GHz output power is greater than 4mW.The 340 GHz sub-harmonic mixer id designed and tested also.Simulation shows that when IF frequency is lower than 25 GHz and LO frequency is ranging from 165 GHz to 175 GHz,conversion loss is lower than 8dB.Measured results show conversion loss lower than 13 dB when LO frequency is 165 GHz and 172 GHz.This thesis has also conducted a room communication test with a dual carrier terahertz communication system.Each baseband channel generates a 1.6Gsps 16 QAM signal,together realizing 12.8Gbps wireless communication.