相控阵雷达和差网络的设计  

Design of Sum-and-difference Network Used in Phased Array Radar

作　　者：卢威 刘芸[1] LU Wei;LIU Yun(Nanjing Research Institute of Electronics Technology,Nanjing Jiangsu 210039,China)

机构地区：[1]南京电子技术研究所,江苏南京210039

出　　处：《现代雷达》2023年第9期90-93,共4页Modern Radar

摘　　要：为了获得目标的距离、方位角和俯仰角等位置信息,多功能相控阵雷达常用和差网络进行馈电。文中介绍了一种对称多节耦合线8.34 dB定向耦合器,结合耦合器交叉串联的设计思想,实现了一款两个七节上下交叉串联的小型化超宽带90°3 dB电桥。4个3 dB电桥和雷达系统中的移相器拓扑组合实现了八端口和差网络。对称多节定向耦合器直通口与耦合口的输出相位具有正交性,因此实现的和差网络在频带内拥有良好的相位一致性。测试结果表明:在f_(0) GHz~3f_(0) GHz,该网络的损耗小于8.5 dB,驻波小于1.45,带内幅度一致性小于±0.8 dB,相位一致性小于±4°,尺寸为130 mm×110 mm×1.6 mm。该和差网络具有性能优良、结构简单、易加工的特点,目前已应用于相控阵雷达系统中。In order to obtain the position information of target,such as distance,azimuth angle and pitch angle,the multi-functional phased array radar is usually fed with the sum-and-difference network.A symmetric multi-section coupled-transmission-line directional coupler is presented in this paper.Combined with the design idea of coupler cross-series,a two seven-section symmetrical directional coupler cross-serial 90 degree 3 dB wide-band bridge is proposed.Four 3 dB hybrid bridges and phase shifters in radar system are connected to form eight-port sum-and-difference network.The output phase of symmetric multi-element coupled-transmission-line directional coupler between through port and coupling port is orthogonal.Therefore,the realized sum-and-diference network has good phase consistency.The measured results show that the network has good microwave transmission performance.The loss is less than 2.2 dB,the VSWR is less than 1.4,the amplitude unbalance is less than ±0.5 dB,and the phase unbalance is less than ±4° in the range of f_(0) GHz~3f_(0) GHz.The size is 130 mm×110 mm×1.6 mm.The sum-and-diference network which has the characteristics of excellent performance,simple structure and easy machining has been applied to phased array radar.

关 键 词：和差网络 对称多节耦合器 3 dB电桥 

分 类 号：TN958.92[电子电信—信号与信息处理]