Research On MCM Integration Of Analog Fore-End Of Multi-Channel Radar Receiver

With the continuous development of electronic technology,the miniaturization and lightweight of electronic devices have become more and more important.This thesis focuses on the miniaturization and integration of the fore-end receiver of radar guidance system in Ku band.The miniaturization and integration of the receiver helps to reduce the size of the system,increase the wiring density of the substrate and shorten the length of transmission lines.As for the receiver,the high-density integration has a significant effect on the reduction on both weight and size and at the same time saves expenses on time and money with modularized application.At present the high-density integration mainly focuses on T/R modules and researches multi-channel receivers which has the potential to be integrated due to the same structure of each channel are relatively rare.With the analysis and comparison on different high-density integration technologies,LTCC technology with its excellent response in high frequencies and advantages on integration is chosen for the integration of the four channel receiver working in Ku band.As the frequency goes up,the transmission line and RF devices are confronted with grave challenges.This thesis has done deep research on the high-density integration in aspects from circuit to the transmission line design in radio frequency and solves the problem of the miniaturization of the receiver and signal integrity of the transmission lines.The result proves that the multi-channel receiver has met the requirements on targets including gain,noise factor and 1d B gain compression point.In order to ensure the established targets of the receiver are met and at the same time requirements on miniaturization are reached,this thesis cuts through the structure of the circuit and studies the key parameters that accounts for the performance of the system by means of mathematical analysis,providing a solid reference when choosing devices.After studies on several receivers,a 50 Ohm receiver system which is suitable for high-density integration is proposed and components are determined.With the analysis of the mathematical model of receivers and verification and simulation using software,the structure of the receiver is proved to meet the requirements of the targets.Based on the structure of the receiver,the wiring and layout is completed taking signal integrity into consideration.In order to solve the problem of signal integrity the transmission line faces when frequency goes up,the analysis and verification is done on the microstrip line and bonding wire used by LTCC technology.With the help of the mathematical model,the key factors that determine the signal quality is studied and the exact structure of the microstrip line is settled and the characteristics of signal transmission are verified using HFSS afterwards.An optimization is done involving the height,length and diameter of the bonding wire which is connected with the microstrip line.Based on the layout of the four-channel receiver,a co-simulation is done by ADS and Cadence to validate the signal quality of the shapes that forms the microstrip lines,followed by the simulation on the key parameters of each receiver that contains the transmission lines.At last the multi-channel receiver is manufactured.Tests on the product indicates that the performance of the receiver has reached our estimation.