Research On Key Technology Of Antenna In Close Range Detection System

The rapid advancement of electronic technology has given rise to the refinement and application of numerous technologies,and close range radar detection technology is a rapidly developing branch of the radar discipline.This technology not only demonstrates its unique value in military applications,but also has wide applications in civilian fields.In the civilian field,Radio Frequency Identification(RFID)technology derived from radar’s friend or foe identification system has become an indispensable part of many supporting technologies in the Internet of Things.In military applications,millimeter wave close range fuze radar has shown enormous potential in modern warfare due to its high detection accuracy,high target recognition rate,and excellent anti-interference performance.Antenna is the core component in the design of close-range radar detection system.For different application scenarios,the antenna design is required to make corresponding adaptations in terms of bandwidth performance,beam coverage and gain control.The development of antenna technology has a significant impact on improving the overall per-formance of the system.This dissertation focuses on the application requirements of close range RFID detection systems and close range fuse radar detection systems,and conducts in-depth exploration and analysis of key technologies such as antenna radiation characteristics control,bandwidth expansion,and structural conformal design.The main contributions and innovations of this dissertation are summarized as fol-lows:(1)For the application scenarios of fine management such as book management and jewelry inventory,this dissertation proposes a close range RFID reader antenna with both far-field suppression and near-field uniformity,based on an improved design of a pla-nar four arm spiral antenna,which cancels out the radiation of adjacent spiral arms.This achieves a balance between far-field suppression and near-field uniformity,demonstrating efficient reading performance with no missed readings in the workspace and no misread-ings outside the workspace.(2)This dissertation proposes a broadband conical beam antenna design method based on circular microstrip lines for the lateral detection requirements of close range fuze radars.This method is based on circular microstrip lines,utilizing dual-mode reso-nance characteristics to expand bandwidth,and using asymmetric feeding technology to break the symmetry of the quasi TEM mode field,achieving stable radiation of quasi TEM modes and thus achieving broadband stable radiation.This conical beam antenna design method can achieve flexible design of broadband radiation characteristics and beam point-ing,overcoming the problem that traditional conical beam antenna design methods cannot balance both.(3)This dissertation proposes a novel all metal cylindrical conformal surface wave end emitting antenna based on surface wave radiation control technology for the forward detection requirements of close range fuze radar with side wall conformal design,as well as a cylindrical conformal surface wave end emitting antenna based on substrate integra-tion.Both designs can effectively achieve conformal shape with cylindrical large metal flooring while maintaining excellent end-fire performance.This research achievement provides an innovative solution for fuse radar applications that require sidewall installa-tion and maintain forward detection.(4)In order to verify the effectiveness of the side wall conformal close range fuze radar terminal antenna based on surface wave radiation control technology in practical applications,this dissertation constructs a close range fuze radar detection system that in-tegrates millimeter-wave antenna,RF transceiver module,intermediate frequency channel module,and signal processing module,with a detection range of 2 m～12 m.The fea-sibility and performance of cylindrical conformal surface wave end emitting antennas in practical application scenarios have been successfully verified through anti-interference testing and distance detection testing.