Research On Key Technologies Of Multi-channel T/R Module

The core module of modern AESA(Active Phased Array Radar)is the T/R component.The performance indicators of the T/R module will directly affect the operational indicators such as AESA's orientation accuracy,reconnaissance capabilities,wavenumber sidelobe suppression capabilities and control distance.The cost,module size and energy consumption of T/R modules are strictly controlled in military radar systems such as aerospace and shipboard.In order to further improve the survival and combat capabilities of the radar,it is of great significance to research and design the integrated,lightweight,and miniaturized T/R components of the transceiver channel.Based on the multilayer composite medium substrate process,a Ku-band twentyfour-channel T/R module is designed in this project,and each channel has two branches for transmission and reception.The designed twenty-four-channel T/R components in this antenna system mainly implement functions such as amplification of RF signals,distribution/combination of RF signals,phase control,amplitude control,and RF power management(adjusting the duty cycle).Based on the project indicators,based on the microwave transmission line theory,this paper designs the project solutions around technical difficulties such as equipment miniaturization,electromagnetic compatibility,and processing technology.Through reasonable layout design,amplifier pulse modulation design,component stack-up design,and passive device simulation design,the technical difficulties are subdivided and gradually solved,and the designed components are assembled and tested.Based on the theory of Wilkinson power divider,this subject optimized the design of a 24-channel microstrip line power division/synthesis network.In the Ku working frequency band,the isolation between each power division port of the power division/synthesis network is ?27dB,and the return loss of each port is ?22dB.Based on the microwave transmission line theory,this topic analyzes and optimizes the vertical transition structure required in the component stack design.The simulation results show that the vertical transition structure has a return loss ?25dB and has good transmission performance.Based on the theoretical basis and principles of thermal design,the heat dissipation performance of the component was analyzed through the Flutherm thermal simulation software to verify the reliable heat dissipation performance of the component.Within the Ku operating frequency range,the 24 channels of the T/R module designed for this subject have a standing wave of ?1.35;the receiving gain of the 24-channel module is ?17.3dB(?3.5dB@single-channel operation),and the singlechannel receiving noise Coefficient ?4 dB,the gain changes in different phase shift states are ?1dB;Transmitting single-channel power ?22.9dBm,in-band spurious suppression ?70dBc,power waveform pulse top-down ?0.2 dB,rising and falling edge pulses ?20ns,twenty-four-channel T/R module size is 231mm×40mm×8.5mm.The component has the characteristics of many channels,high integration and small size.