摘要
针对八单元圆形顺序旋转阵列天线馈电网络结构复杂的问题,文章设计了一种宽带双圆极化馈电网络。首先,根据八单元圆形顺序旋转阵列天线的空间结构特点,分析了阵列馈电网络的幅度和相位关系;其次,分别设计了3dB分支线耦合器、威尔金森功分器、微带平面巴伦和移相器;最后,通过不断优化设计,构建了宽带双圆极化馈电网络。该网络由2个3dB分支线耦合器、2个威尔金森功分器、4个微带平面巴伦、2个45°移相器、2个90°移相器和1个180°移相器组成。测试结果表明:该网络在8.78GHz^11.12GHz的频带内,端口电压驻波小于1.72。8个输出端口的幅度起伏在2.1 dB以内,相位起伏在±7.8°以内。该馈电网络具备左旋和右旋圆极化馈电端口,具有频带宽、幅相特性良好和制作成本低等优点,完全满足八单元顺序旋转阵列天线馈电网络的要求。
Aiming at the complex structure of eight-element circular sequence rotation antenna feed network, the wideband dual circular-polarization feed network is proposed in this paper. Firstly,according to the space structure of the antenna array,the amplitude and phase characteristics are analyzed. Then,3 dB branch-line couplers,microstrip planar baluns, Wilkinson dividers and phase shifters are designed,respectively. Lastly,the wideband dual circular-polarization feed network is constructed through continuous optimum design. The network is comprised of two 3 dB branch-line couplers,two Wilkinson dividers,four microstrip planar baluns,two 45° phase shifters,two 900° phase shifters and one 1800° phase shifter. The measurement results have demonstrated that the voltage VSWRs are less than 1.72 during the frequency band from 8.78 GHz to11.12 GHz. The amplitude imbalance and phase imbalance are within ±2. 1 dB and ±7.8°,respectively. The network considered here has left-hand and right-hand circular-polarization ports,which exhibits the advantages of wide frequency band,excellent amplitude-phase characteristics and low cost. The feed network proposed here fully meets the requirement of the eight-element sequence rotation antenna array.
作者
谢辉
俞忠武
XIE Hui;YU Zhongwu(Air Force Military Representative Office of Jingxi Region,Beijing 100040,China;Military Representative Office Stationed at 720 Factory,Nanjing 210038,China)
出处
《空间电子技术》
2018年第6期66-69,共4页
Space Electronic Technology
关键词
宽带
馈电网络
圆极化
Wideband
Feed network
Circular-polarization
