Abstract: In this paper,a Ku-band high-power and high-efficiency monopulse transceiver module is designed and implemented.The receiving chain consists of sum and difference channels.A Wilkinson power dividing/combining nerwork is realized using ceramic thin-film circuit technology,which combines two MMIC power amplifier chips based on GaN HEMT dies.A high-power and high-added-efficiency power amplifier(PA) assembled on a copper-molybdenum-copper (Cu-Mo-Cu) carrier is developed.The transmitting chain adopts a two-stage power amplification topology with a GaAs- based power amplifier and the PA.This work mainly focuses on the methods to improve the output power and efficiency of the module,and introduces the corresponding thermal design.Test results show that within a 2GHz bandwitdh in the Ku band,the gains of both the sum and difference receiving channels are 21dB,with noise figures below 3.5dB and 2.3dB respectively.Under an excitation signal power of 7±3dBm,the output power is no less than 75W(pulse width 100μs,duty cycle 10%),the power consumption is no more than 16W(pulse width 100μs,duty cycle 4%),ahd the efficiency is no less than 22%(pulse width 100μs,duty cycle 4%).The module exhibits excellent performance and is equipped with functions such as output power monitoring.