摘要
介质板极化器在天线设计中的应用非常广泛。从介质板波导形成圆极化波的原理出发,推导出差相移与波导传播常数的关系式。因此只需利用数值方法计算波导的传播常数,从而减小了仿真计算量。分析表明在8-18GHz超宽带范围内,方波导中插入介质板的圆极化轴比理论上只能达到2.03dB。文中提出介质板插入结合波导口径变形的方法使圆极化轴比小于1.53dB,驻波比小于1.23。对介质板波导的关键参数进行误差分析,得到加工误差对圆极化性能的影响小于2.5%。
Dielectric-sheet polarizer has been widely applied in antenna design. Based on the principle that dielectric-sheet waveguide generates circular polarization wave, this paper analyzes the relationship between the differential phase shift and the waveguide transmission constant. The calculation amount of simula- tion is decreased due to applying only numerical value method in calculating waveguide transmission constant. Analysis proves that the dielectric-sheet of the square waveguide circular polarization axis ratio can only reach 2.03 dB within 8 18GHz ultra-wideband range theoretically. The paper proposes that the circular polarization axis ratio could be less than 1.53 dB and VSWR could be less than 1.23 by inserting the dielectric-sheet into waveguide to change the caliber of waveguide. Analyzing errors on key parameters of dielectric-sheet waveguide, the paper concludes that the influence of processing error on the circular polarization performance has been reduced to 2.5 % or less.
出处
《雷达科学与技术》
2008年第5期396-400,共5页
Radar Science and Technology
关键词
介质板极化器
圆极化性能分析
波导口径变换
误差分析
dielectric-sheet polarizer
circular polarization analysis
waveguide caliber transformation
error analysis
