Design Of Millimeter Wave Fixed Distance Radio Frequency Receiving And Transmitting Circuit

The fuze is a device that detects the target by using the electromagnetic scattering characteristics of the target and controls the detonation of ammunition timely.It is the control system of the weapon equipment and determines the damage performance of the weapon system.The millimeter-wave FM ranging fuze is one of the important development directions of radio fuzes due to its high range resolution,high receiving sensitivity and good anti-interference performance.In this paper,the RF circuit of 8mm wave FM ranging fuze is studied,and the front-end modules are miniaturized and optimized.Finally,a complete RF front-end has been designed.The work of millimeter-wave FM fuze during the research period mainly includes the following aspects:Firstly,the design scheme of the millimeter-wave ranging fuze is determined.The working principle of FM fuze and the advantages of using millimeter-wave FM fuze to complete ranging are analyzed,and the link simulation of the front-end of ranging fuze is simulated by ADS software.Secondly,the design of transmitting circuit module of millimeter-wave FM rangning fuze is studied and realized.A miniaturized FM frequency source with high power flatness and linearity is designed;the disadvantages of traditional Wilkinson power divider in millimeter-wave band are analyzed;a miniaturized high isolation millimeter-wave power divider is realized by improving the branch line length and output ports position of power divider;and a low insertion loss circulator is selected and designed to be used in a fuze system whose transceiver antenna share.Then,the design of receiving circuit module of millimeter-wave FM ranging fuze is studied and realized.Aiming at the low power of the echo signal of FM fuze,a low noise amplifier module is designed to amplify the echo signal and reduce the noise figure of the receiver.The structure of the mixer is compared,and in order to reduce the noise and increase the isolation of the port,a passive mixer module is designed and realized,which completes the mixing of the transmitted signal and the echo signal.The frequency range of the intermediate frequency signal is calculated from the angle of the ranging error.In order to improve the ranging accuracy,the band-pass filter is designed and IF filter in the range of ranging error is realized.Finally,a miniaturized fuze front-end is designed and implemented.Based on the research of transmitting and receiving circuit module,the power supply module of the system is designed,and the overall improvement and optimization of the front-end is completed,which reduces the loss of the system,and the performance of the millimeter-wave front-end system is further improved,the miniaturization design is realized,and the test results of the front-end ranging are given.The results show that the fuze meets the accuracy requirements of ranging and meets the design targets of the system.