摘要
使用Microwave Office软件,仿真分析MUSER-I（0.4-2 GHz）和MUSER-II（2-15 GHz）3 d B定向耦合器.电桥采用多节耦合器实现,且每节耦合器的长度为中心频率波长的1/4,对电桥进行分析并制作实物.实测结果表明,MUSER-I的3 d B定向耦合器的输出幅度在（-3±0.2）d B,输出端口相位差在91.9°-89°之间;MUSER-II的3 d B定向耦合器的电压驻波比在全频带范围内小于1.31,输出端口相位差在96.05°-85°之间.通过日像仪系统接收太阳左旋和右旋圆偏振射电信号,并计算信号的圆偏振度,得到观测圆偏振度与太阳信号本身圆偏振度之间的误差和太阳信号本身偏振度的关系.当太阳信号本身极化度为10%时,误差最大为9.4%.
The 3 d B couplers of MUSER-I and MUSER-II are simulated using Microwave office software. Because of the ultra wide frequency band,multiple single couplers are used to synthesis one symmetrical coupler. The amplitude of MUSER-I 3 d B hybrid is（- 3 ± 0. 2） d B,and the phase difference of this port is between 91. 9° and 89°. For MUSER-II 3 d B hybrid,the voltage standing wave ratio is less than 1. 31 and the phase difference is between 96. 05° and 85°. This radioheliograph receives left and right circularly polarized radio signals. The difference between the polarization degree of the Sun and the observed polarization degree is also measured,and the error is9. 4% when the original polarization degree is 10%.
出处
《中国科学院大学学报（中英文）》
CSCD
北大核心
2016年第4期477-483,共7页
Journal of University of Chinese Academy of Sciences
基金
国家重大科研装备项目(ZDYZ2009-3)
国家青年基金(11203042)
联合基金(U1231205)
国家自然科学基金面上项目(11573043)资助
关键词
超宽带
电压驻波比
耦合器
偏振度
ultra wide band
VSWR
degree of coupling
degree of polarization
