Research On 220 GHz Frequency Multiplication Technology Based On Planar Schottky Diode

The terahertz wave is a gem in the electromagnetic spectrum.It has a unique position and role,and it contains the vast scientific prospects that are now recognized by the world.Acquiring efficient terahertz frequency sources is a crucial step in driving terahertz technology to maturity.At present,the most mainstream method for obtaining a terahertz frequency source capable of operating at room temperature is using solid-state terahertz frequency source that is superior in reliability,structure,cost,etc.,and its development depends on advances in semiconductor technology.Based on a large number of researches on terahertz frequency multipliers based on planar Schottky diodes at home and abroad,this paper explores the establishment of the model of planar Schottky diodes in the terahertz band.Then,the frequency multiplier is designed by the subsection design method and the synthesis design method respectively.The advantage of the subsection design method is that the performance of each unit can be inspected intuitively during the design process.At the same time,after the design is completed,the design of the subsequent relevant frequency bands can be transplanted to the previously designed unit circuit,which saves time of the subsequent similar design.The advantage of the synthesis design method is that it provides more simulation optimization space for the design of the frequency multiplier circuit,and saves the design time of the unit circuit.In this study,220 GHz wideband triplers with two different circuit topologies are studied according to the above method.Among them,the 220 GHz balanced broadband tripler based on the synthesis design method is driven by fixed power of 100 mW in the range of output frequency 200GHz~240GHz.The simulation results show that the overall frequency conversion loss is better than 13.5dB with the best conversion loss of 12.9dB,and the return loss is better than 10 dB and the 3dB bandwidth is 28.3%.The measured results show that when driving at a fixed power of 100 mW,the output power of the triplier is greater than 0.8mW in the range of 200GHz~240GHz,and the efficiency is greater than 0.8%,and the optimal output power of 2.4mW is obtained at 216 GHz.A 220 GHz unbalanced broadband tripler is designed by the subsection design method.The simulated results show that driven by 100 mW fixed power,the overall frequency conversion loss is better than 15.8dB in the range of 200GHz~240GHz output frequency with 3dB bandwidth about 23.6%,and the optimal conversion loss is 14.3dB.The measured results show that when driving at a fixed power of 100 mW,the output power of the triplier is greater than 0.95 mW in the range of 202GHz~234GHz,and the efficiency is greater than 0.95%,and the optimal output power of 1.86 mW is obtained at 222 GHz.