Research On Structure Design Of An Airborne Ku-Band Solid-State Transmitter

As one of the core parts of airborne radar,solid-state transmitters have longer lifetime,higher reliability,smaller size and lighter weight than vacuum tube transmitter,and have no heating on the cathode.Its technology has been paid more and more attention by various research institutions,military industry and civil enterprises at home and abroad.The domestic solid-state transmitters have been widely used in various fields,and the working band of the transmitters has been developed from p-band,l-band and s-band to the current c-band,x-band and k-band,among which the Ku band solid-state transmitters are also a hot topic in current research and development.This paper came from the Ku band solid state transmitter project of a certain aircraft airborne radar.According to various technical indices and working environment of the airborne radar,the solid-state transmitters were required to have the features of long continuous working time,small size,light weight,heat dissipation and other comprehensive performance.Based on the design experience and achievements of solid-state transmitters at home and abroad,this paper mainly studied the following aspects:(1)The overall scheme of the transmitter was designed by analyzing and calculating technical indices and key technologies of the Ku solid-state transmitter.(2)The three-dimensional design software was applied to modeling and designing the transmitter,the structure design of which is eventually completed.(3)The heat dissipation problem of the transmitter was mainly designed,the cooling scheme of the transmitter was selected,the thermal design was analyzed and calculated,and the thermal simulation analysis was carried out by using FLOEFD software.(4)The transmitter's structure was designed to prevent shock and vibration,and the strength of the transmitter chassis was simulated and analyzed by the finite element analysis software.(5)The transmitter's reliability,electromagnetic compatibility,safety,environmental adaptability and three-proofs like mold,moisture and salt mist and so on were studied respectively.In this paper,the transmitter was optimized and strictly controlled in its structure,device and assembly to ensure the consistency control of the power division/synthesis network and to improve the synthesizing efficiency.This transmitter adopted a special power detection module,which could combine the functions of coupler and detector and save space.This transmitter integrated the power supply unit with different voltage and power as well as the timing control circuit into an independent module for encapsulation,which saved space and improves the reliability of the whole machine.Through the modular design,the transmitter was smaller in size,lighter in weight,better in heat dissipation and comprehensive performance.This series of innovative design made the transmitter suitable for the aircraft airborne environment,met the design criteria and technical requirements and the transmitter has been applied to using.The successful development of Ku-band solid-state transmitter provides valuable experience for the development of similar transmitter technology.